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Journal articles on the topic 'Orr'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hai, Nguyen Luong. "Modeling of organizational behavior framwork for road usage charge management." Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE 18, no. 1 (2024): 82–92. http://dx.doi.org/10.31814/stce.huce2024-18(1)-07.

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Organizational behavior plays a crucial role in effective management. However, there is limited research onorganizational behaviors in road usage charging management. This study aims to address this gap by identifying six dimensions of organizational behavior through focus group studies. Questionnaires were administered to 138 professionals in Vietnam, and the data were analyzed using structural equation modeling. The findings revealed six behavioral dimensions: Responsibilities fulfillment (OR1), Progress assurance (OR2), Aligned implementation organization (OR3), Hierarchical and delegated m

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2

Khurana, Ashok Kumar, Aruj Kumar Khurana, Bhawna P. Khurana, and Indu Bala Khurana. "Oculo-Visceral Reflexes Revisited: A Comprehensive Review." Delhi Journal of Ophthalmology 34, no. 2 (2024): 95–99. https://doi.org/10.4103/dljo.dljo_186_23.

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Oculovisceral reflexes, in addition to oculocardiac reflex (OCR), include oculorespiratory reflex (ORR), oculodepressor reflex (ODR), oculogastric reflex (OGR), and the other needing unveiling. The OCR is a well-recognized phenomenon with potentially significant clinical implications. It is essential for health-care providers, particularly those involved in eye surgeries, i.e., eye surgeons and anesthetists to be knowledgeable about the OCR and take appropriate measures to prevent and manage its effects to ensure patient safety. While our understanding of the ORR has advanced in recent years,

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3

Albayrak İskender, Nurcan. "Endophytic bacterial diversity of Origanum rotundifolium: isolation and molecular identification of strains." Turkish Journal of Biodiversity 8, no. 1 (2025): 11–16. https://doi.org/10.38059/biodiversity.1704823.

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Endophytic bacteria in medicinal and aromatic plants provide valuable insights into the microbial diversity of these plants and form the basis for research on their ecological roles and biotechnological potential. In this study, the endophytic bacterial diversity of Origanum rotundifolium Boiss. was determined, and a total of eleven endophytic bacteria were isolated from the root, stem, and leaf tissues of O. rotundifolium. The isolated bacteria were characterized based on certain morphological and biochemical properties. Molecular identification was performed using 16S rRNA gene sequencing. T

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4

Tuan, Ngo Anh, Nguyen Luong Hai, and Pham Huy Tung. "Modeling of organizing function management in Vietnam’s public construction works." Journal of Project Management 7, no. 4 (2022): 191–200. http://dx.doi.org/10.5267/j.jpm.2022.5.003.

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Organizing function is the significant component of management guaranteeing the success of construction works. Many studies have been emphasizing on the topic of critical success factors (CSFs) within construction works, yet the results have rarely emphasized examining organizing behaviors within public construction work management; these less researched topics were the aims of this study. To fulfil this research aim, a regression analysis design was employed. Data were collected using questionnaires conducted from 139 professionals involved in public construction works management in Vietnam.

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Morales, Dulce M., Mariya A. Kazakova, Maximilian Purcel, Justus Masa, and Wolfgang Schuhmann. "The sum is more than its parts: stability of MnFe oxide nanoparticles supported on oxygen-functionalized multi-walled carbon nanotubes at alternating oxygen reduction reaction and oxygen evolution reaction conditions." Journal of Solid State Electrochemistry 24, no. 11-12 (2020): 2901–6. http://dx.doi.org/10.1007/s10008-020-04667-2.

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Abstract Successful design of reversible oxygen electrocatalysts does not only require to consider their activity towards the oxygen reduction (ORR) and the oxygen evolution reactions (OER), but also their electrochemical stability at alternating ORR and OER operating conditions, which is important for potential applications in reversible electrolyzers/fuel cells or metal/air batteries. We show that the combination of catalyst materials containing stable ORR active sites with those containing stable OER active sites may result in a stable ORR/OER catalyst if each of the active components can s

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6

Jeon, Jaeeun, Kyoung Ryeol Park, Kang Min Kim, et al. "CoFeS2@CoS2 Nanocubes Entangled with CNT for Efficient Bifunctional Performance for Oxygen Evolution and Oxygen Reduction Reactions." Nanomaterials 12, no. 6 (2022): 983. http://dx.doi.org/10.3390/nano12060983.

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Exploring bifunctional electrocatalysts to lower the activation energy barriers for sluggish electrochemical reactions for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are of great importance in achieving lower energy consumption and higher conversion efficiency for future energy conversion and storage system. Despite the excellent performance of precious metal-based electrocatalysts for OER and ORR, their high cost and scarcity hamper their large-scale industrial application. As alternatives to precious metal-based electrocatalysts, the development of earth-abu

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7

Zhou, Yanan, Guoping Gao, Wei Chu, and Lin-Wang Wang. "Computational screening of transition metal-doped phthalocyanine monolayers for oxygen evolution and reduction." Nanoscale Advances 2, no. 2 (2020): 710–16. http://dx.doi.org/10.1039/c9na00648f.

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The best catalyst for the OER is Ir@Pc with an η<sup>OER</sup> of 0.41 V followed by Rh@Pc with an η<sup>OER</sup> = 0.44 V. For the ORR process, the best catalyst is Rh@Pc with an η<sup>ORR</sup> of 0.44 V followed by Ir@Pc (η<sup>ORR</sup> = 0.55 V).

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8

Putra, Ridwan P., Ihsan Budi Rachman, Hideyuki Horino та Izabela I. Rzeznicka. "Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions". Oxygen 2, № 4 (2022): 479–92. http://dx.doi.org/10.3390/oxygen2040031.

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Nickel oxyhydroxides (NiOOHs) are well-known for their superior activity toward oxygen evolution reaction (OER) in alkaline solutions. However, their activity toward oxygen reduction reaction (ORR) has been largely unexplored. There exist three NiOOH polymorphs: α-, β-, and γ-NiOOH, characterized by different interlayer spacing. Although still debated, γ-NiOOH with a large layer spacing has been indicated as the active phase for OER. Here, a highly crystalline γ-NiOOH was prepared in a carbon matrix by the in situ electrochemical transformation of nickel dithiooxamide Ni(dto) in 1 M KOH soluti

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9

Kim, Seung-hoon, Yoonmook Kang, and Hyung Chul Ham. "First-Principles Study of Pt-Based Bifunctional Oxygen Evolution & Reduction Electrocatalyst: Interplay of Strain and Ligand Effects." Energies 14, no. 22 (2021): 7814. http://dx.doi.org/10.3390/en14227814.

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We examined the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) of Pt-based Pt3M/Pt nanoalloy catalysts (where M represents a 3d transition metal) for bifunctional electrocatalysts using spin-polarized density functional theory calculations. First, the stability of the Pt3M/Pt catalyst was investigated by calculating the bulk formation energy and surface separation energy. Using the calculated adsorption energies for the OER/ORR intermediates in the modeled catalysts, we predicted the OER/ORR overpotentials and potential limiting steps for each catalyst. The origins of the

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10

Wang, Guilin, Xiaoqin Feng, Rongrong Ren, Yuxin Wang, Jie Meng, and Jianfeng Jia. "Theoretical Study on ORR/OER Bifunctional Catalytic Activity of Axial Functionalized Iron Polyphthalocyanine." Molecules 29, no. 1 (2023): 210. http://dx.doi.org/10.3390/molecules29010210.

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Designing efficient ORR/OER bifunctional electrocatalysts is very significant for reducing energy consumption and environmental protection. Hence, we studied the ORR/OER bifunctional catalytic activity of iron polyphthalocyanine (FePPc) coordinated by a series of axial ligands which has different electronegative coordination atom (FePPc-L) (L = -CN, -SH, -SCH3, -SC2H5, -I, -Br, -NH2, -Cl, -OCH3, -OH, and -F) in alkaline medium by DFT calculations. Among all FePPc-L, FePPc-CN, FePPc-SH, FePPc-SCH3, and FePPc-SC2H5 exhibit excellent ORR/OER bifunctional catalytic activities. Their ORR/OER overpo

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11

Nguyen, Thi Xuyen, Jun-Hong Sun, and Jyh-Ming Ting. "S-Doped La_0.8Sr_0.2(CrMnFeCoNi)O₃ High Entropy Perovskite As Efficient Bifunctional Oxygen Evolution Reaction/Oxygen Reduction Reaction Electrocatalyst." ECS Meeting Abstracts MA2024-02, no. 41 (2024): 2724. https://doi.org/10.1149/ma2024-02412724mtgabs.

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Developing non-noble metal, low cost, highly efficient and stable bifunctional oxygen evolution reaction (OER)/oxygen reduction reaction (ORR) electrocatalyst has attracted significant interests for several applications such as metal air battery. Herein, we report an S-doped high entropy perovskite oxide (HEPO) of La0.8Sr0.2(CrMnFeCoNi)O3 electrocatalyst for bifunctional OER/ORR electrocatalyst. We show that S-doped La0.8Sr0.2(CrMnFeCoNi)O3 electrocatalyst exhibits a low OER overpotential of 385 mV at 10 mA cm-2 and a half-wave potential of 0.728 V for ORR in 0.1 M KOH. The electrocatalyst als

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12

Ikezawa, Atsunori, Kotaro Seki, and Hajime Arai. "Rational Placement of Catalysts for Oxygen Reduction and Evolution Reactions Based on the Reaction Sites in Porous Gas Diffusion Electrodes." ECS Meeting Abstracts MA2022-02, no. 4 (2022): 522. http://dx.doi.org/10.1149/ma2022-024522mtgabs.

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Metal-air secondary batteries using alkaline electrolyte solutions are promising candidates for next-generation large-scale energy storage systems because of their potential high capacity, low cost, and high safety standard. However, large overpotential of bifunctional air electrodes hindered their wide applications. Recently, increasing research on electrocatalysts for oxygen reduction reaction (ORR) and oxygen reduction reaction (OER) has been conducted to reduce the overpotential, and many active catalysts have been developed. On the other hand, formation of reaction sites is also important

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13

Rahman, Sheikh Tareq, Kyong Yop Rhee, and Soo-Jin Park. "Nanostructured multifunctional electrocatalysts for efficient energy conversion systems: Recent perspectives." Nanotechnology Reviews 10, no. 1 (2021): 137–57. http://dx.doi.org/10.1515/ntrev-2021-0008.

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Abstract Electrocatalysts play a significant performance in renewable energy conversion, supporting several sustainable methods for future technologies. Because of the successful fabrication of distinctive oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) electrocatalysts, bifunctional ORR/OER and HER/OER electrocatalysts have become a hot area of contemporary research. ORR, OER, and HER have gained considerable attention because of their strong performance in different energy conversion and storage devices, including water-splitting device

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14

Singh, Harish, McKenzie Marley Hines, Shatadru Chakravarty, and Manashi Nath. "Multi-Walled Carbon Nanotube Supported Manganese Selenide As Highly Active Bifunctional OER and ORR Electrocatalyst." ECS Meeting Abstracts MA2022-01, no. 34 (2022): 1376. http://dx.doi.org/10.1149/ma2022-01341376mtgabs.

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Transition metal selenides have attracted intensive interest as cost-effective electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) because of the continuous thrust in sustainable energy conversion. In this article a Mn-based bifunctional electrocatalyst, MnSe has been identified which shows efficient OER and ORR activity in alkaline medium. The catalytic activity could be further enhanced by using multiwalled carbon nanotubes (MWCNT) asadditives which increases the charge transfer and electronic conductivity of the catalyst composite. This MnSe@MWCNT cataly

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15

Cheng, J., P. Ganesan, Z. Wang та ін. "Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study". Materials Advances 3, № 1 (2022): 272–81. http://dx.doi.org/10.1039/d1ma00632k.

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Perovskite oxides with a low cost and high catalytic activity are considered as suitable candidates for the oxygen evolution reaction (OER)/oxygen reduction reaction (ORR), but most of them favour only either the ORR or the OER.

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16

Kan, Dongxiao, Dashuai Wang, Xilin Zhang, et al. "Rational design of bifunctional ORR/OER catalysts based on Pt/Pd-doped Nb2CT2 MXene by first-principles calculations." Journal of Materials Chemistry A 8, no. 6 (2020): 3097–108. http://dx.doi.org/10.1039/c9ta12255a.

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17

Yang, Hong Bin, Jianwei Miao, Sung-Fu Hung, et al. "Identification of catalytic sites for oxygen reduction and oxygen evolution in N-doped graphene materials: Development of highly efficient metal-free bifunctional electrocatalyst." Science Advances 2, no. 4 (2016): e1501122. http://dx.doi.org/10.1126/sciadv.1501122.

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical to renewable energy conversion and storage technologies. Heteroatom-doped carbon nanomaterials have been reported to be efficient metal-free electrocatalysts for ORR in fuel cells for energy conversion, as well as ORR and OER in metal-air batteries for energy storage. We reported that metal-free three-dimensional (3D) graphene nanoribbon networks (N-GRW) doped with nitrogen exhibited superb bifunctional electrocatalytic activities for both ORR and OER, with an excellent stability in alkaline electrolytes (for exam

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18

Park, Ji-Woo, and Young-Wan Ju. "Evaluation of Bi-Functional Electrochemical Catalytic Activity of Co3O4-CoFe2O4 Composite Spinel Oxide." Energies 16, no. 1 (2022): 173. http://dx.doi.org/10.3390/en16010173.

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are important for developing energy systems such as fuel cells and metal–air batteries. Precious metal catalysts, such as Pt and IrO2, have been considered electrochemical catalysts because of their excellent activity for the ORR and OER. However, their disadvantages, such as low durability for long-term operation and high price, necessitate the development of alternative electrochemical catalysts. Transition metal oxides with excellent electrical conductivity, high efficiency, and stability have been considered alternative el

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19

Chen, Xiao, Fengshuang Han, Xi Chen, Chenxi Zhang, and Wangyan Gou. "Cerium-Doped CoMn2O4 Spinels as Highly Efficient Bifunctional Electrocatalysts for ORR/OER Reactions." Catalysts 12, no. 10 (2022): 1122. http://dx.doi.org/10.3390/catal12101122.

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Low-cost and highly efficient electrocatalysts for oxygen reactions are highly important for oxygen-related energy storage/conversion devices (e.g., solar fuels, fuel cells, and rechargeable metal-air batteries). In this work, a range of compositionally-tuned cerium-doped CoMn2O4 (Ce-CMO-X) spinels were prepared via oxidizing precipitation and subsequent crystallization method and evaluated as electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The Ce modification into the CMO spinels lead to the changes of surface electronic structure. And Ce-CMO-X ca

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20

Li, Pengzhang, Qing Huang, Wei Yang та ін. "The Role of the A-Site Cation on the Bifunctional Electrocatalytic Activities of Ln0.5Sr0.5CoO3-δ (Ln = La, Pr and Sm) for Rechargeable Zinc–Air Batteries". Catalysts 13, № 3 (2023): 483. http://dx.doi.org/10.3390/catal13030483.

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Developing efficient bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is crucial for the large-scale application of rechargeable zinc–air batteries. Perovskite oxides are attractive candidates as bifunctional electrocatalysts. Herein, Ln0.5Sr0.5CoO3-δ (Ln = La, Pr and Sm) was prepared by the sol-gel method and evaluated as bifunctional electrocatalysts for both ORR and OER. Compare with La0.5Sr0.5CoO3-δ (LSC) and Sm0.5Sr0.5CoO3-δ (SSC), Pr0.5Sr0.5CoO3-δ (PSC) demonstrated the enhanced catalytic activity towards ORR with the limi

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21

Madan, Chetna, Ankita Mathur, and Aditi Halder. "Facile Generation of a Stable Bi-Functional Mixed Phase Fe₃O₄/Fe-N₄ Electrocatalyst for Rechargeable Zinc-Air Battery." Journal of The Electrochemical Society 169, no. 2 (2022): 020516. http://dx.doi.org/10.1149/1945-7111/ac4dad.

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The successful commercialization of rechargeable zinc-air batteries requires an inexpensive and stable bifunctional oxygen electrocatalyst which can efficiently facilitate both the oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER). In this paper, we are reporting a simple and effective route to introduce nitrogen functionalities coordinated with Fe to generate ORR active Fe-N4 species. Fe-N-C catalytic sites are known to play an active role towards ORR; however, the higher oxidation state of Fe has been speculated to be good for OER. This method generates a mixture of

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Zhang, Peng, Xuejing Yang, Wang Gao, et al. "First-principles design of bifunctional oxygen reduction and evolution catalysts through bimetallic centers in metal–organic frameworks." Catalysis Science & Technology 8, no. 14 (2018): 3666–74. http://dx.doi.org/10.1039/c8cy00675j.

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Bi-metallic Fe<sub>x</sub>Co<sub>3−x</sub>(THT)<sub>2</sub> nanosheets exhibit bifunctional catalytic activity for both the ORR and OER. The ORR occurs on the Co atom, while the active site for the OER is the Fe atom.

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23

Hale, William, and Pabitra Choudhury. "Thermodynamic Stability and Intrinsic Activity of La1−xSrxMnO3 (LSM) as an Efficient Bifunctional OER/ORR Electrocatalysts: A Theoretical Study." Catalysts 12, no. 3 (2022): 260. http://dx.doi.org/10.3390/catal12030260.

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Perovskite oxides, being transition metal oxides, show promise as bifunctional catalysts being able to catalyze both oxygen evolution reactions (OER) and oxygen reduction reactions (ORR). These two reactions play a crucial role in energy storage and energy conversion devices. An important feature of perovskite catalyst is their ability to be tuned, as tuning can positively affect both reactivity and stability. In this study, Density Functional Theory (DFT) has been utilized to calculate both the equilibrium phase stability and the overpotentials (reactivity performance indicator of the catalys

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24

Chen, Tse-Wei, Palraj Kalimuthu, Ganesan Anushya, et al. "High-Efficiency of Bi-Functional-Based Perovskite Nanocomposite for Oxygen Evolution and Oxygen Reduction Reaction: An Overview." Materials 14, no. 11 (2021): 2976. http://dx.doi.org/10.3390/ma14112976.

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High efficient, low-cost and environmentally friendly-natured bi-functional-based perovskite electrode catalysts (BFPEC) are receiving increasing attention for oxygen reduction/oxygen evolution reaction (ORR/OER), playing an important role in the electrochemical energy conversion process using fuel cells and rechargeable batteries. Herein, we highlighted the different kinds of synthesis routes, morphological studies and electrode catalysts with A-site and B-site substitution co-substitution, generating oxygen vacancies studies for boosting ORR and OER activities. However, perovskite is a novel

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25

Wang, Bowen, Nian Tao, Junchen Liu, et al. "Spindle Spinel CoFeCoO4 Microparticles/rGO as an Oxygen Reduction and Oxygen Evolution Catalyst." Nano 14, no. 04 (2019): 1950043. http://dx.doi.org/10.1142/s1793292019500437.

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The representative spinel-type materials AB2O4 (both A and B are transition metals) electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have been investigated and significant improvements have been achieved in the activity and durability for ORR and OER in the alkaline solution. But CoFeCoO4 was not explored widely like ZnCo2O4 (or NiCo2O[Formula: see text] as the ORR electrocatalyst for its relatively complicated atomic site occupation. CoFeCoO4 has a typical cubic spinel structure with Co[Formula: see text] in the tetrahedron and Co[Formula: see text] and

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26

Beall, Casey Elizabeth, Emiliana Fabbri, Nataša Diklić, et al. "Investigating Perovskite Oxide Catalysts As Bifunctional Oxygen Electrodes Using Operando XAS." ECS Meeting Abstracts MA2022-01, no. 34 (2022): 1377. http://dx.doi.org/10.1149/ma2022-01341377mtgabs.

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With the increase in renewable energy usage comes the need for energy storage systems due to intermittency issues. Hydrogen storage systems have been identified as one solution. Unitized regenerative fuel cells (URFC) combine electrolyzers and fuel cells in one device, allowing electricity to be stored and used easily. However, the oxygen electrodes are still affected by high overpotentials and slow kinetics. Perovskite oxides have been identified as a class of materials, which are low-cost, tunable, and active for the oxygen reduction (ORR) and evolution (OER) reactions. Here, we investigate

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27

Persada, Pilar Bela, Davin Adinata Tan, Rachendra Akmalia, Yuyun Irmawati, and Afriyanti Sumboja. "Solvent-free Synthesis of Transition Metals Nanoparticles Decorated Foamy Flakes-like Nitrogen-doped Carbon as Bifunctional-catalyst for High-performance Rechargeable Zn-air Batteries." Journal of Engineering and Technological Sciences 56, no. 5 (2023): 666–78. http://dx.doi.org/10.5614/j.eng.technol.sci.2024.56.5.10.

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Transition metal-nitrogen-carbon (M/NC) demonstrates a promising effective electrocatalyst for enhancing oxygen evolution/reduction reactions (OER/ORR). However, synthesizing these catalysts is often complex, time-consuming, and involves hazardous solvents while producing a low yield. This work introduces a versatile, eco-friendly, and straightforward solvent-free method to produce M/NC (M = Co, Ni, and Fe) catalysts in ~3 h using a glucose, urea, and metal nitrate hydrate mixture. The high-yield M/NC catalysts exhibit a porous architecture and uniform distribution of metal nanoparticles withi

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Xie, Wenli, Bin Cui, Desheng Liu, Haicai Huang, and Chuanlu Yang. "Rational Design of Covalent Organic Frameworks-Based Single Atom Catalysts for Oxygen Evolution Reaction and Oxygen Reduction Reaction." Molecules 30, no. 7 (2025): 1505. https://doi.org/10.3390/molecules30071505.

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The rational design of high-performance catalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential for the development of clean and renewable energy technologies, particularly in fuel cells and metal-air batteries. Two-dimensional (2D) covalent organic frameworks (COFs) possess numerous hollow sites, which contribute to the stable anchoring of transition metal (TM) atoms and become promising supports for single atom catalysts (SACs). Herein, the OER and ORR catalytic performance of a series of SACs based on TQBQ-COFs were systematically investigated thro

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29

Wang, Jing, Shuwei Zhang, Haihong Zhong, et al. "Nitrogen-Doped Ordered Mesoporous Carbons Supported Co3O4 Composite as a Bifunctional Oxygen Electrode Catalyst." Surfaces 2, no. 2 (2019): 229–40. http://dx.doi.org/10.3390/surfaces2020018.

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It is increasingly useful to develop bifunctional catalysts for oxygen reduction and oxygen evolution reaction (ORR and OER) for fuel cells, metal-air rechargeable batteries, and unitized regenerative cells. Here, based on the excellent conductivity and stability of ordered mesoporous carbons, and the best ORR and OER activity of Co3O4, the composite Co3O4/N-HNMK-3 was designed and manufactured by means of a solvothermal method, using ordered N-doped mesoporous carbon (N-HNMK-3) as substrate, and then the bifunctional electrocatalytic performance corresponding to ORR, OER in alkaline media was

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30

Sun, Jia, Ning Wang, Zhaozhong Qiu, Lixin Xing, and Lei Du. "Recent Progress of Non-Noble Metal Catalysts for Oxygen Electrode in Zn-Air Batteries: A Mini Review." Catalysts 12, no. 8 (2022): 843. http://dx.doi.org/10.3390/catal12080843.

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play crucial roles in energy conversion and storage devices. Particularly, the bifunctional ORR/OER catalysts are core components in rechargeable metal–air batteries, which have shown great promise in achieving "carbon emissions peak and carbon neutrality" goals. However, the sluggish ORR and OER kinetics at the oxygen cathode significantly hinder the performance of metal–air batteries. Although noble metal-based catalysts have been widely employed in accelerating the kinetics and improving the bifunctionality, their scarcity

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Milikić, Jadranka, Filipe Gusmão, Sara Knežević, et al. "Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis." Batteries 10, no. 6 (2024): 197. http://dx.doi.org/10.3390/batteries10060197.

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Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This be

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32

Zhou, Yanan, Guoping Gao, Jun Kang, Wei Chu, and Lin-Wang Wang. "Transition metal-embedded two-dimensional C3N as a highly active electrocatalyst for oxygen evolution and reduction reactions." Journal of Materials Chemistry A 7, no. 19 (2019): 12050–59. http://dx.doi.org/10.1039/c9ta01389j.

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The best catalyst for OER is Rh-V<sub>CC</sub> with η<sup>OER</sup> of 0.35 V, followed by Co-V<sub>CC</sub> (0.43 V). For ORR, Rh-V<sub>CC</sub> exhibits the lowest η<sup>ORR</sup> value of 0.27 V, followed by Co-V<sub>CC</sub> (0.42 V).

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Zhou, Tao, and Zheng Xiao Guo. "Metal-Oxygen Covalency Competition of Unsymmetrical Metal Pairs for Enhanced Bifunctional Oxygen Electrocatalysis." ECS Meeting Abstracts MA2023-02, no. 58 (2023): 2845. http://dx.doi.org/10.1149/ma2023-02582845mtgabs.

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Rechargeable zinc-air batteries are considered promising energy conversion devices due to their inherent safety and high energy-to-cost ratio. However, the sluggish kinetics of oxygen evolution reaction and oxygen reduction reaction during the charging-discharging process lead to low round trip efficiency and power density. The synthesis of efficient and stable bifunctional oxygen electrocatalysts constitutes the bottleneck to construct applicable ZABs. Here, we report an Mn-doped ruthenium oxide electrocatalyst that exhibits remarkable ORR/OER activity, with a low potential gap of 0.62V betwe

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Bosse, Jan, and Andrew Akbashev. "Spontaneous Oxygen Reduction on Perovskite Oxide Surface in Aqueous Medium." ECS Meeting Abstracts MA2023-01, no. 44 (2023): 2449. http://dx.doi.org/10.1149/ma2023-01442449mtgabs.

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Oxygen reduction/evolution reactions (OER/ORR) do not normally occur spontaneously at room temperature. Here, we will demonstrate that a perovskite oxide can drive a spontaneous ORR in aqueous media. Our experiments show that spontaneous ORR, while taking place at open-circuit conditions, results in a severe oxidation of the surface and causes cation leaching, oxygen intercalation and gradual dissolution of the perovskite. Using DFT and molecular dynamics simulations of the perovskite-electrolyte system, we propose a possible mechanism for this highly unusual phenomenon. Likely, a spontaneous

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Xu, Zhiwen, and Minhua Shao. "(Invited) Graphene-Supported Fe/Ni Single Atoms and Feni Alloy Nanoparticles as Bifunctional Oxygen Electrocatalysts for Rechargeable Zinc-Air Batteries." ECS Meeting Abstracts MA2024-01, no. 36 (2024): 2052. http://dx.doi.org/10.1149/ma2024-01362052mtgabs.

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To alleviate the severe energy crisis and environmental problems caused by the massive and unsustainable consumption of fossil fuels, it is urgent to develop renewable energy conversion and energy storage technologies to reform the traditional energy structure. Batteries are considered as one of the most promising energy storage technologies due to their sustainability, high efficiency and less pollution. Among various battery storage devices, rechargeable zinc-air batteries (ZABs) have attracted widespread attention on account of their high theoretical energy density (1086 Wh kg– 1), low cost

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Carlson, Evan, Michal Bajdich, William C. Chueh, and J. Tyler Mefford. "Bifunctional Oxygen Electrocatalysis on Manganese Oxide." ECS Meeting Abstracts MA2023-01, no. 36 (2023): 2091. http://dx.doi.org/10.1149/ma2023-01362091mtgabs.

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Limited supply of precious metals impedes the scale up of electrolyzer production. To enable 100s of GWs of PEM electrolyzer capacity by 2030, iridium supply must grow by more than 10x.[1] Alternatively, catalysts made of cheaper, more abundant manganese could relieve these constraints, if engineered to have comparable activity and stability. The unique bifunctional OER/ORR activity of Mn oxide could also enable electrolyzers that both produce and consume fuel with a single catalyst. Yet rational design of Mn oxide catalysts requires a better understanding of the structural and chemical motifs

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Milikić, Jadranka, Nikola Nikolić, Diogo M. F. Santos, et al. "Platinum–Dysprosium Alloys as Oxygen Electrodes in Alkaline Media: An Experimental and Theoretical Study." Nanomaterials 12, no. 14 (2022): 2318. http://dx.doi.org/10.3390/nano12142318.

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Platinum–dysprosium (Pt–Dy) alloys prepared by the arc melting technique are assessed as potential electrodes for the oxygen reduction reaction (ORR) using voltammetry and chronoamperometry in alkaline media. A relatively small change (10 at.%) in the alloy composition brought a notable difference in the alloys’ performance for the ORR. Pt40Dy60 electrode, i.e., the electrode with a lower amount of Pt, was identified to have a higher activity towards ORR as evidenced by lower overpotential and higher current densities under identical experimental conditions. Furthermore, DFT calculations point

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38

Eom, Seung Wook, Se Young Ahn, Chang Woo Lee, Yang Kook Sun, and Mun Soo Yun. "Preparation and Electrochemical Evaluation of La_1-xSr_xMnO₃ Cathode Material for Zinc Air Secondary Batteries Application." Solid State Phenomena 124-126 (June 2007): 1055–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1055.

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We prepared nano-sized La1-xSrxMnO3 (x=0.2~0.5) cathode catalyst for the zinc air secondary batteries by citrate method and measured cathode’s electrochemical characteristics according to content of strontium compose the cathode catalyst. We heat treated the prepared precursor at various calcination temperature (500~900), and examined the optimum calcinations temperature by XRD analysis and electrochemical evaluation. We examined the ORR (oxygen reduction reaction) and OER (oxygen evolution reaction) performance of the prepared La1-xSrxMnO3 catalyst powder. La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 ca

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Park, Ji-Woo, Jeeyoung Shin, and Young-Wan Ju. "Influence of Calcination Temperature on Electrochemical Properties of Perovskite Oxide Nanofiber Catalysts." Energies 16, no. 13 (2023): 4979. http://dx.doi.org/10.3390/en16134979.

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Energy conversion and storage systems have recently attracted significant attention owing to increasing environmental and energy problems. However, the slow kinetics of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) render their commercialization difficult. Many studies are being conducted to replace precious metal catalysts that have high activity for the ORR and OER but have scarcity and low stability. In this study, Sm0.5Sr0.5CoO3 (SSC) nanofibers were fabricated via the electrospinning of non-precious metal-based perovskite oxides to replace precious metal cata

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Shin, Seoyoon, Seokhee Lee та Tae Ho Shin. "Metal(Pt, Pd)-Perovskite Oxide(Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ) Hybrid Material As a Bifunctional Electrocatalyst for Lithium-Air Battery". ECS Meeting Abstracts MA2023-02, № 4 (2023): 667. http://dx.doi.org/10.1149/ma2023-024667mtgabs.

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The rapid depletion of fossil fuel resources and growing concerns over climate change have made the development of next-generation batteries a top priority. Among these, Li-O2 batteries have attracted significant interest due to their potential for much higher gravimetric energy storage density compared to other chemical batteries. However, efficient and cost-effective catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical for the efficient functioning of these batteries. In recent years, complex perovskite oxides, such as Ba0.5Sr0.5Co0.8Fe0.2O3-δ (B

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Milikić, Jadranka, Rodolfo O. Fuentes, Julia E. Tasca, Diogo M. F. Santos, Biljana Šljukić, and Filipe M. L. Figueiredo. "Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media." Batteries 8, no. 8 (2022): 100. http://dx.doi.org/10.3390/batteries8080100.

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Nickel-doped ceria (Ce1−xNixO2−δ) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1−xNixO2−δ electrocatalysts. The Tafel analysis of the ORR in the 0.57–0.78 V vs. RHE potential window leads to slopes in the 70–108 mV dec−1 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are d

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Shin, Sun Young, Min Ju Kim, and Jin Joo. "Oculocardiac reflex and oculorespiratory reflex during strabismus surgery under general anesthesia using the laryngeal mask airway with maintenance of spontaneous respiration: A retrospective study." Journal of International Medical Research 48, no. 8 (2020): 030006052094515. http://dx.doi.org/10.1177/0300060520945158.

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Objective To determine (1) how the specific muscle undergoing surgical treatment affects the occurrence of the oculocardiac reflex (OCR) and oculorespiratory reflex (ORR) and (2) whether the depth of anesthesia influences the occurrence of the OCR and ORR in patients undergoing strabismus surgery with a laryngeal mask airway with maintenance of spontaneous respiration. Methods The medical records of patients who underwent strabismus surgery on the lateral rectus (LR) and medial rectus (MR) muscles from January 2017 to December 2017 were retrospectively reviewed. Results The incidence of the OC

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Zhu, Liwei, Jiajun Wang, Jie Liu, et al. "First Principles Study of the Structure–Performance Relation of Pristine Wn+1Cn and Oxygen-Functionalized Wn+1CnO2 MXenes as Cathode Catalysts for Li-O2 Batteries." Nanomaterials 14, no. 8 (2024): 666. http://dx.doi.org/10.3390/nano14080666.

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Li-O2 batteries are considered a highly promising energy storage solution. However, their practical implementation is hindered by the sluggish kinetics of the oxygen reduction (ORR) and oxygen evolution (OER) reactions at cathodes during discharging and charging, respectively. In this work, we investigated the catalytic performance of Wn+1Cn and Wn+1CnO2 MXenes (n = 1, 2, and 3) as cathodes for Li-O2 batteries using first principles calculations. Both Wn+1Cn and Wn+1CnO2 MXenes show high conductivity, and their conductivity is further enhanced with increasing atomic layers, as reflected by the

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Liu, Rui, Atsunori Ikezawa, Takeyoshi Okajima, and Hajime Arai. "Designing Bifunctional Bilayer Air Electrode for Zinc−Air Batteries." ECS Meeting Abstracts MA2024-02, no. 1 (2024): 74. https://doi.org/10.1149/ma2024-02174mtgabs.

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Rechargeable zinc-air batteries, typically composed of a zinc metal negative and an air positive electrode are promising candidate for next-generation energy-storage devices owing to its high theoretical energy density, abundant raw materials and safe non-flammable electrolytes. Nevertheless, the primary challenges encountered by air electrode are the high overpotential and limited cycling durability due to the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), occurring in the discharging and charge processes. It has been demonstrated that ORR and OER ta

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Kuznetsov, Denis A., Yi-Hsuan Wu, and Christoph R. Müller. "Rationalizing the Effect of the Redox-Inactive Metals on the Activity of Oxides in Oxygen Electrocatalysis." ECS Meeting Abstracts MA2023-02, no. 41 (2023): 2043. http://dx.doi.org/10.1149/ma2023-02412043mtgabs.

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The large-scale implementation of renewable energy conversion and storage technologies is a key challenge to transition to a sustainable society. One of the most critical elements towards this goal is the discovery of active, stable and inexpensive catalysts for electrochemical energy conversion processes, such as the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which are central for the efficiency of water-splitting electrolyzers, fuel cells and metal–air batteries.1 Manganese-based spinels, MxMn3-xO4, and ruthenium pyrochlores, M2Ru2O7 − δ, are known as active catalys

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Davari, Elaheh, and Douglas G. Ivey. "Mn-Co oxide/PEDOT as a bifunctional electrocatalyst for oxygen evolution/reduction reactions." MRS Proceedings 1777 (2015): 1–6. http://dx.doi.org/10.1557/opl.2015.449.

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ABSTRACTBifunctional electrocatalysts, which facilitate the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), are vital components in advanced metal-air batteries. Results are presented for carbon-free, nanocrystalline, rod-like, Mn-Co oxide/PEDOT bifunctional electrocatalysts, prepared by template-free sequential anodic electrodeposition. Electrochemical characterization of synthesized electrocatalysts, with and without a conducting polymer (PEDOT) coating, was performed using cyclic voltammetry (CV) and linear sweep voltammetry (LSV). In addition, microstructural character

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47

Dong, Hongzhou, Yingjie Chen, Chong Gong, et al. "N, S, P-Codoped Graphene-Supported Ag-MnFe2O4 Heterojunction Nanoparticles as Bifunctional Oxygen Electrocatalyst with High Efficiency." Catalysts 11, no. 12 (2021): 1550. http://dx.doi.org/10.3390/catal11121550.

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Due to slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during discharging and charging processes, it is essential to rationally design and synthesize non-precious metal bifunctional electrocatalysts with good performance for metal-air batteries. Herein, Ag-MnFe2O4 heterojunction nanoparticles supported on N, S, P-codoped graphene (NSPG) are developed with enhanced ORR and OER bifunctional electrocatalytic activities and stability. In contrast, S, P-doped graphene (SPG) and N, P-doped graphene (NPG) show less stabilization for the heterojunction particles. F

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48

Kang, Nianxin, Yage Luan, Yu Jiang, et al. "Neuroprotective Effects of Oligosaccharides in Rehmanniae Radix on Transgenic Caenorhabditis elegans Models for Alzheimer’s Disease." Frontiers in Pharmacology 13 (June 17, 2022). http://dx.doi.org/10.3389/fphar.2022.878631.

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Rehmanniae Radix (RR, the dried tuberous roots of Rehmannia glutinosa (Gaertn.) DC.) is an important traditional Chinese medicine distributed in Henan, Hebei, Inner Mongolia, and Northeast in China. RR is frequently used to treat diabetes mellitus, cardiovascular disease, osteoporosis and aging-related diseases in a class of prescriptions. The oligosaccharides and catalpol in RR have been confirmed to have neuroprotective effects. However, there are few studies on the anti-Alzheimer’s disease (AD) effect of oligosaccharides in Rehmanniae Radix (ORR). The chemical components and pharmacological

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Yuasa, Masayoshi, Miu Tanaka, Masayo Shimizu, and Mamia Yoshida. "Mechanochemical Synthesis of Nitrogen-Doped and Sulfur-Doped Multilayer Graphene for Use in Bifunctional Oxygen Electrodes." Journal of The Electrochemical Society, June 13, 2022. http://dx.doi.org/10.1149/1945-7111/ac7829.

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Abstract Nitrogen-doped and sulfur-doped mechanochemically synthesized multilayer graphene (N-doped and S-doped MSMG) were prepared by planetary ball-milling, and they were used in bifunctional gas diffusion electrodes (GDEs) for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Graphite, melamine, and elemental sulfur were used as raw materials. The surface area-normalized linear sweep voltammograms revealed that the N-doped and S-doped MSMG have higher intrinsic ORR/OER activity than the undoped MSMG. When the MSMG samples were used in GDEs, the N-doped and S-doped MSM

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50

Somdee, Siriwimol, Meena Rittiruam, Tinnakorn Saelee, et al. "First‐Principles Investigations on Effects of B‐Site Substitution (B═Mn, Fe, and Co) on La‐Based Perovskite Oxides As Bifunctional Electrocatalysts for Rechargeable Metal–Air Batteries." Advanced Theory and Simulations, April 16, 2024. http://dx.doi.org/10.1002/adts.202301235.

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AbstractThe effects of B‐site substitution (B═Mn, Fe, and Co) in La‐based perovskite oxides (LPOs); LaMnO3, LaFeO3, LaCoO3, as bifunctional electrocatalysts during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in metal–air batteries (MABs) under an alkaline electrolyte (pH = 13) are investigated using density functional theory (DFT). It is found that LaMnO3 exhibits higher ORR activity than others with ORR overpotential (ηORR) of 0.57 V, but its OER activity is poor with OER overpotential (ηOER) of 1.12 V. The ηORR (0.59 V) and ηOER (1.13 V) of LaMn0.75Fe0.25O3 closely re

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