Relevant bibliographies by topics / Overall water splitting

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Overall water splitting'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Overall water splitting"

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Ikeda, Shigeru, Tsuyoshi Takata, Takeshi Kondo, Go Hitoki, Michikazu Hara, Junko N. Kondo, Kazunari Domen, Hideo Hosono, Hiroshi Kawazoe, and Akira Tanaka. "Mechano-catalytic overall water splitting." Chemical Communications, no. 20 (1998): 2185–86. http://dx.doi.org/10.1039/a804549f.

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Xing, Jun, Wen Qi Fang, Hui Jun Zhao, and Hua Gui Yang. "Inorganic Photocatalysts for Overall Water Splitting." Chemistry - An Asian Journal 7, no. 4 (January 25, 2012): 642–57. http://dx.doi.org/10.1002/asia.201100772.

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Li, Yu Hang, Yun Wang, Li Rong Zheng, Hui Jun Zhao, Hua Gui Yang, and Chunzhong Li. "Water-soluble inorganic photocatalyst for overall water splitting." Applied Catalysis B: Environmental 209 (July 2017): 247–52. http://dx.doi.org/10.1016/j.apcatb.2017.03.001.

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Maeda, Kazuhiko, Kentaro Teramura, Nobuo Saito, Yasunobu Inoue, Hisayoshi Kobayashi, and Kazunari Domen. "Overall water splitting using (oxy)nitride photocatalysts." Pure and Applied Chemistry 78, no. 12 (January 1, 2006): 2267–76. http://dx.doi.org/10.1351/pac200678122267.

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Oxynitride photocatalysts with d10 electronic configuration are presented as effective non-oxide catalysts for overall water splitting. Germanium nitride (β-Ge3N4) having a band gap of 3.8-3.9 eV modified with RuO2 nanoparticles as a cocatalyst is shown to achieve stoichiometric decomposition of H2O into H2 and O2 under UV irradiation (λ > 200 nm). A novel solid solution of GaN and ZnO, (Ga1-xZnx)(N1-xOx), with a band gap of 2.4-2.8 eV (depending on composition) achieves overall water splitting under visible light (λ > 400 nm) when loaded with an appropriate cocatalyst. The narrower band gap of the solid solution is attributed to the bonding between Zn and N atoms at the top of the valence band. The photocatalytic activity of (Ga1-xZnx)(N1-xOx) for overall water splitting is strongly dependent on both the cocatalyst and the crystallinity and composition of the material. The quantum efficiency of (Ga1-xZnx)(N1-xOx) with Rh and Cr mixed-oxide nanoparticles is 2-3 % at 420-440 nm, which is the highest reported efficiency for overall water splitting in the visible-light region.
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Xie, Yunchao, Chi Zhang, Xiaoqing He, Tommi White, John D. Demaree, Mark Griep, and Jian Lin. "Monolithic electrochemical cells for overall water splitting." Journal of Power Sources 397 (September 2018): 37–43. http://dx.doi.org/10.1016/j.jpowsour.2018.06.099.

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Sun, Lan, Qiaomei Luo, Zhengfei Dai, and Fei Ma. "Material libraries for electrocatalytic overall water splitting." Coordination Chemistry Reviews 444 (October 2021): 214049. http://dx.doi.org/10.1016/j.ccr.2021.214049.

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Chen, Lin-Wei, and Hai-Wei Liang. "Ir-based bifunctional electrocatalysts for overall water splitting." Catalysis Science & Technology 11, no. 14 (2021): 4673–89. http://dx.doi.org/10.1039/d1cy00650a.

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Yu, Huidi, Yurui Xue, Lan Hui, Feng He, Chao Zhang, Yuxin Liu, Yan Fang, et al. "Graphdiyne-engineered heterostructures for efficient overall water-splitting." Nano Energy 64 (October 2019): 103928. http://dx.doi.org/10.1016/j.nanoen.2019.103928.

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Takata, Tsuyoshi, Akira Tanaka, Michikazu Hara, Junko N. Kondo, and Kazunari Domen. "Recent progress of photocatalysts for overall water splitting." Catalysis Today 44, no. 1-4 (September 1998): 17–26. http://dx.doi.org/10.1016/s0920-5861(98)00170-9.

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Maeda, Kazuhiko, Kentaro Teramura, Nobuo Saito, Yasunobu Inoue, and Kazunari Domen. "Photocatalytic Overall Water Splitting on Gallium Nitride Powder." Bulletin of the Chemical Society of Japan 80, no. 5 (May 15, 2007): 1004–10. http://dx.doi.org/10.1246/bcsj.80.1004.

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Dissertations / Theses on the topic "Overall water splitting"

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Sommers, Jacob. "Towards Photocatalytic Overall Water Splitting via Small Organic Shuttles." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34607.

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This thesis studies the development of a new method for photochemical overall water splitting using a small organic shuttle. In Section 2, BiVO4, was studied to determine the CO2 reduction mechanism and how catalytic activity decays. BiVO4 catalysts were capable of producing a maximum of 200 μmol of methanol per gram of catalyst from CO2 in basic media, and later decomposed by BiVO4. The decay of BiVO4¬ was studied by x-ray diffraction and scanning electron microscopy, demonstrating reversible decomposition of BiVO4. BiVO4 is etched, leeching vanadium into solution, while nanoparticles of bismuth oxide are deposited on the surface of BiVO4. In Section 3, ferrocyanide salts, an aqueous, cheap, and abundant photocatalyst was used for the first time to dehydrogenate aqueous formaldehyde selectively into formate and hydrogen. The catalyst is capable of record turnovers and turnover frequencies for formaldehyde dehydrogenation catalysts. A preliminary mechanism was proposed from experimental and computational data.
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Jiang, Tao. "Development of Alkaline Electrolyzer Electrodes and Their Characterization in Overall Water Splitting." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCA006.

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La décomposition électrolytique de l’eau en hydrogène et oxygène à l’aide d’électricité renouvelable générée par les courants marins ou à partir d’énergie éolienne ou solaire, constitue l’une des voies les plus propres et directes pour produire de l’hydrogène. Toutefois, la production de grands volumes d’hydrogène par décomposition électrolytique de l’eau comporte un verrou technologique qui réside dans la forte surtension à vaincre à l’anode où de l’oxygène est dégagé. Ce travail de thèse s’est attaché donc à mettre au point des matériaux d’électrodes capables de catalyser de l’eau en oxygène de façon efficace et stable, en utilisant des éléments chimiques suffisamment abondants sur terre. Pour cela nous avons exploré des composés présentant des porosités à structures hiérarchiques et des procédés de préparation efficaces, aisées à mettre en œuvre et susceptibles d’un usage à l’échelle industrielle. Nous avons développé deux types d’électrocatalyseurs d’oxydation de l’eau en oxygène en mettant au point deux voies de préparation impliquant chacune une phase d’activation in situ. Le premier type est une mousse de nickel dopée à la fois avec des cristaux de nickel, des nanoparticules de tétroxyde de tricobalt et des nanofeuilles d’oxyde de graphène via nickelage électrolytique, suivi d’une activation électrochimique in situ pour former de l’hydroxyde de nickel et des nano-plaques d’oxy-hydroxyde du même métal. Ce catalyseur hybride s’est avéré avoir des performances électrocatalytiques de bon niveau, comparables à celles des électrodes à base de métaux nobles qui sont disponibles dans l’état actuel de la technique ; il a en outre fait preuve d’une excellente stabilité en fonctionnement. Ces propriétés remarquables semblent liées à la fois aux dépôts formés sur la mousse de nickel par les différentes phases actives citées, aux nanoparticules d’oxy-hydroxyde de nickel, ainsi qu’aux effets de synergie qu’elles y induisent. Le second type d’électrocatalyseurs a été obtenu en combinant la projection thermique (HVOF) et un processus d’activation chimique puis électrochimique. Le matériau résultant possède de nanocouches du type jamborite formée in situ, sur la matrice poreuse à structure hiérarchique. Le catalyseur développé dans ce travail présente non seulement une surtension et une pente de Tafel exceptionnellement faibles, mais également une stabilité remarquable. Ces performances sont dues à un puissant effet de synergie dans laquelle interviennent la grande activité intrinsèque des nanofeuilles de jamborite et la grande rapidité des transports d’électrons et d’ions assurée par l'architecture poreuse hiérarchique. Il convient de noter que cette nouvelle méthodologie a le potentiel de produire des électrodes de grandes tailles apte à l’électrolyse alcaline de l'eau et crée ainsi de nouvelles perspectives dans le cadre de la conception d'électrocatalyseurs à la fois très actifs et stables. Nous avons également développé, initialement, des électrocatalyseurs destinés à la réduction de l’eau en hydrogène, qui impliquent également une activation électrochimique in situ. Ces électrodes peuvent être ainsi couplées aux électrodes précitées d’oxydation de l’eau en oxygène pour former des cellules électrochimiques complètes à deux électrodes, dont les performances rivalisent avec celles développées par le couple dioxyde de ruthénium/platine qui représente le meilleur état de la technique dans le cadre de la production d’hydrogène et d’oxygène par électrolyse de l’eau. En résumé, en combinant des techniques conventionnelles de revêtement et d’activation électrochimique in situ, ce travail a permis de développer une méthodologie de préparation d'électrodes catalytiques offrant de hautes performances et susceptibles de commercialisation. La technique d’activation électrochimique in situ exploite un comportement d'auto-optimisation dynamique qui est aisé à mettre en œuvre, facilement adaptable, efficace et respectueux de l'environnement
Splitting water into hydrogen and oxygen by electrolysis using electricity from intermittent ocean current, wind, or solar energies is one of the easiest and cleanest routes for high-purity hydrogen production and an effective way to store the excess electrical power without leaving any carbon footprints. The key dilemma for efficient large-scale production of hydrogen by splitting of water via the hydrogen and oxygen evolution reactions is the high overpotential required, especially for the oxygen evolution reaction. Hence, engineering highly active and stable earth-abundant oxygen evolution electrocatalysts with three-dimensional hierarchical porous architecture via facile, effective and commercial means is the main objective of the present PhD study. Finally, we developed two kinds of good performance oxygen evolution electrocatalysts through two different way combined with in situ electrochemical activation.For the first oxygen evolution electrocatalyst, we report a codoped nickel foam by nickel crystals, tricobalt tetroxide nanoparticles, graphene oxide nanosheets, and in situ generated nickel hydroxide and nickel oxyhydroxide nanoflakes via facile electrolytic codeposition in combination with in situ electrochemical activation as a promising electrocatalyst for oxygen evolution reaction. Notably, this hybrid catalyst shows good electrocatalytic performance, which is comparable to the state-of-the-art noble catalysts. The hybrid catalyst as an electrocatalytically-active and robust oxygen evolution electrocatalyst also exhibits strong long-term electrochemical durability. Such a remarkable performance can be benefiting from the introduced active materials deposited on nickel foam, in situ generated nickel oxyhydroxide nanoflakes and their synergistic effects. It could potentially be implemented in large-scale water electrolysis systems.For the second oxygen evolution electrocatalyst, a facile and efficient means of combining high-velocity oxy-fuel spraying followed by chemical activation, and in situ electrochemical activation based on oxygen evolution reaction has been developed to obtain a promising self-supported oxygen evolution electrocatalyst with lattice-distorted Jamborite nanosheets in situ generated on the three-dimensional hierarchical porous framework. The catalyst developed in this work exhibits not only exceptionally low overpotential and Tafel slope, but also remarkable stability. Such a remarkable feature of this catalyst lies in the synergistic effect of the high intrinsic activity arising from the lattice-dislocated Jamborite nanosheets as the highly active substance, and the accelerated electron/ion transport associated with the hierarchical porous architecture. Notably, this novel methodology has the potential to produce large-size-electrode for alkaline water electrolyzer, which can provide new dimensions in design of highly active and stable self-supported electrocatalysts.Furthermore, we have also initially developed good hydrogen evolution electrocatalysts upon in situ electrochemical activation, coupled with the obtained superior oxygen evolution electrocatalysts forming two-electrode configurations, respectively, both of which rivalled the integrated state-of-the-art ruthenium dioxide-platinum electrode in alkaline overall water splitting.In summary, a methodology of fabricating easy-to-commercial, high performance catalytic electrodes by combining general coating processes with in situ electrochemical activation has been realized and well developed. The in situ electrochemical activation mentioned above is a dynamic self-optimization behavior which is facile, flexible, effective and eco-friendly, as a strategy of fabricating self-supported electrodes for efficient and durable overall water splitting. We hope our work can promote advanced development toward large-scale hydrogen production using excess electrical power whenever and wherever available
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Park, Kyoung-Won. "Solar-driven overall water splitting on CoO nanoparticles : first-principles density functional theory studies." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117802.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged student-submitted from PDF version of thesis.
Includes bibliographical references (pages 143-157).
Photoelectrochemical (PEC) water splitting has been suggested as a promising techinique for large-scale hydrogen fuel production. In particular, spontaneous photocatalytic overall water splitting on self-standing particles in water without external driving potential has been highlighted as a clean and economical energy generation method for the future. Among various photocatalytic materials, some cobalt-based materials including CoP, Co₂P, Co(OH)₂, CoO, have attained major interest because they exhibit improved catalytic activity for hydrogen evolution in the form of nanoparticles, unlike most cobalt-based materials which have been assessed as water oxidizing catalysts in the past decade. CoO nanoparticles have been observed to photocatalytically split water into H₂ and O₂ at room temperature without an externally applied potential or co-catalyst, with high photo-catalytic efficiency (solar-to-hydrogen efficiency of ~5%) which hits the record among single-material self-standing photocatalysts. The photocatalytic activity of CoO nanoparticles was experimentally shown to stem from the optimal conduction and valence band edge positions (Ec and Ev) relative to water reduction and oxidation potential levels (H+/H₂ and H₂O/O₂), such that the Ec and EV span the water redox potentials. The overall water splitting is not expected from CoO micropowder or bulk CoO because they have band edges far below the H+/H2 level, which are not optimal for overall water splitting. However, the origin of the shift in the band edges due to decrease in particle size (from bulk or micropowder to nanoparticle) was unknown. Moreover, the mechanism by which H₂ and O₂ simultaneously and spontaneously evolve on the nanoparticles, as well as how the CoO nanoparticles could exhibit a high photocatalytic efficiency even without a co-catalyst or an external driving potential have remained unanswered. In this work, we use first-principles density functional theory (DFT) calculations to explore thermodynamically stable surface configurations of CoO in an aqueous environment in which photocatalytic water splitting occurs. We also calculate the Ec and Ev of CoO surfaces relative to water redox potentials, showing that the band edge positions are sensitive to surface chemistry which is determined by surface orientation, adsorbates, and stoichiometry, and thus growth conditions and operating environment. In particular, we predict that CoO nanoparticles have fully hydroxylated CoO(111) facets (OH*-CoO(111)), with band edges spanning the water redox potentials, while larger CoO particles (such as CoO micropowders) have a full monolayer of hydrogen on the CoO(111) facets, with a band alignment that favors water oxidation but not water reduction. From these calculations, we demonstrate that explicit inclusion of liquid water is crucial for accurately predicting the band edge positions, and thus photocatalytic behavior of CoO in an aqueous solution. In order to find the origin of the high efficiency and spontaneous overall water splitting without an external bias or a co-catalyst, we also elucidate the mechanisms for charge separation and H₂ and O₂ evolution on CoO nanoparticles under illumination in an aqueous solution. We demonstrate that electrons are driven to CoO(100) facets and holes are driven to OH*-CoO(111) facets as a result of a built-in potential arising from the very different potential levels of the two facets. We show that H₂ evolution preferentially occurs on the CoO(100) facets, while O2 evolves on the OH*-CoO(111) surfaces, based on our new criteria. Importantly, we suggest that the conventional criterion for determining the feasibility of H₂ or O₂ generation from water splitting - i.e., EC < H+/H₂ level or Ev > H₂O/O₂ level - is insufficient. Instead, we suggest that a more appropriate set of criteria is whether the photo-excited electrons and holes have sufficient energy to overcome the kinetic barrier for the H₂ and O₂ evolution reaction, respectively, on the relevant surface facet. This work explains why and how photocatalytic overall water splitting has been observed only on CoO nanoparticles. Our understanding of the overall water splitting mechanism on CoO nanoparticles provides a general explanation of experimentally observed overall water splitting phenomena on a variety of self-standing photocatalysts as well as a new approach for screening novel photocatalytic materials for efficient water splitting and other reactions.
by Kyoung-Won Park.
Ph. D.
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Zhang, Jian, Tao Wang, Darius Pohl, Bernd Rellinghaus, Renhao Dong, Shaohua Liu, Xiaodong Zhuang, and Xinliang Feng. "Interface Engineering of MoS2/Ni3S2 Heterostructures for Highly Enhanced Electrochemical Overall Water Splitting Activity." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235457.

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To achieve sustainable production of H2 fuel through water splitting, low-cost electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required to replace Pt and IrO2 catalysts. Here, for the first time, we present the interface engineering of novel MoS2/Ni3S2 heterostructures, in which abundant interfaces are formed. For OER, such MoS2/Ni3S2 heterostructures show an extremely low overpotential of ~218 mV at 10 mA cm-2, which is superior to that of the state-of-the-art OER electrocatalysts. Using MoS2/Ni3S2 heterostructures as bifunctional electrocatalysts, an alkali electrolyser delivers a current density of 10 mA cm-2 at a very low cell voltage of ~1.56 V. In combination with density function theory (DFT) calculations, this study demonstrates that the constructed interfaces synergistically favor the chemisorption of hydrogen and oxygencontaining intermediates, thus accelerating the overall electrochemical water splitting.
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Adeli, Koudehi Babak. "Solar hydrogen generation through overall water splitting on gallium-zinc oxynitride visible-light activated photocatalyst." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60303.

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In this study, novel approaches for the development of solar-responsive photocatalysts for water splitting are investigated, with a focus on the gallium-zinc oxynitride solid solution (GaN:ZnO). A facile synthesis technique was developed for the fabrication of nanoporous GaN:ZnO photocatalyst. The synthesis time was reduced substantially to 12 min (from original 10+ h) as the result of effective solid–solid and gas–solid reactant interactions at the nanoscale. The synthesized photocatalyst samples were characterized for their optical, structural, and photochemical properties. Despite the short synthesis time, the prepared nanoporous GaN:ZnO photocatalyst maintained the overall visible-light water splitting activities at reasonable rates, reaching to the maximum apparent quantum efficiency of 2.71% at 420–440 nm. Decoration of the photocatalyst surface with the optimal amount of various hydrogen and oxygen evolution co-catalyst materials through photo-deposition and impregnation was investigated. Our experimental and characterization data suggest a mechanism for minimizing the effect of the undesired charge recombination and reverse reaction through the utilization of structural nanopores as the active water splitting regions. To reduce the recombination of photo-excited charges, the hybridization of GaN:ZnO photocatalyst on highly conductive graphene support was studied. Effective electrochemical interaction between composite components was confirmed through material characterization, photo-induced conversion of graphene oxide to reduced graphene oxide (rGO), and visual observation of co-catalyst nanoparticles on the surface of the conductive nanosheets. The GaN:ZnO-rGO composite photocatalyst exhibited ~70% improvement in photocatalytic hydrogen evolution. Finally, a number of approaches for the synthesis of one-dimensional (1-D) GaN:ZnO photocatalysts were studied. A novel direct fabrication route for 1-D GaN:ZnO through gold-catalyzed atmospheric pressure chemical vapour deposition was proposed. The material characterization data indicated that the proposed method is capable of preparing 1-D GaN:ZnO nanostructures with a wide range of morphologies, including nanofibers and nanowires, via vapour–liquid–solid epitaxy. In addition, via the proposed method, the dimensions of the obtained nanomaterials can be tailored. The synthesized GaN:ZnO nanowires demonstrated promising sacrificial hydrogen evolution compared to the powder and nanofiber photocatalysts. The work presented in this research provides an in-depth understanding of the nanoscale fabrication and optimization of GaN:ZnO photocatalysts for visible-light hydrogen generation.
Chemical and Biological Engineering, Department of
Graduate
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Berto, Tobias [Verfasser], Johannes A. [Akademischer Betreuer] [Gutachter] Lercher, and Tom [Gutachter] Nilges. "Elucidation of reaction pathways of the photoreforming and overall water splitting reaction over precious metal decorated semiconductors / Tobias Berto ; Gutachter: Johannes A. Lercher, Tom Nilges ; Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1123210861/34.

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Lin, Yu-Cheng, and 林于程. "Z-scheme overall water splitting over K4Nb6O17 photocatalyst." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77657577587157549572.

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碩士
國立東華大學
材料科學與工程學系
101
In this study, we combine H2 evolution photocatalyst with O2 evolution photocatalyst, and use an aqueous NaI solution as I-/IO3- shuttle redox mediator in Z-scheme photocatalysis system for water splitting. We use solid state reaction to prepare H2 evolution photocatalyst, K4Nb6O17, and loading Rh as cocatalyst to improve hydrogen production. When the amount of loading Rh up to 1.5wt%, we get H2 evolution rate about 24mmol h-1 g-1 was higher than K4Nb6O17(337μmoleg-1h-1) as prepared. Then, we use exfoliation method to prepare our nanosheets photocatalyst, NS-K4Nb6O17, and loading Rh as cocatalyst, and exhibited a highest H2 evolution rate about 71 mmoleg-1h-1 when 1.5wt%Rh was loading. O2 evolution photocatalyst use WO3 loading 0.5wt%Pt as cocatalyst. The rate of H2 evolution and O2 evolution under UV irradiation significantly changed with the concentration of NaI, and the pH value of the reactant solution. The H2 and O2 production rate of K4Nb6O17/WO3-0.5wt%Pt Z-scheme photocatalysis system was 263μmol h-1 g-1 and 126μmol h-1 g-1, respectively. The optimal NaI concentration of the reactant solution 4mM at pH = 11. The H2 evolution and O2 evolution rate of K4Nb6O17/WO3-0.5wt%Pt Z-scheme photocatalysis system were enhanced by loading Rh nanoparticles as cocatalyst(H2:533μmoleg-1h-1，O2:259μmoleg-1h-1). The Z-scheme photocatalysis system with NS-K4Nb6O17 -1.5 wt%Rh/WO3-0.5wt%Pt photocatalysts exhibited a highest photoactivity with a H2 evolution rate of 1329μmol h-1 g-1 and a O2 evolution rate of 341μmol h-1 g-1.
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Wang, Hsuan-Chi, and 王宣期. "Overall water splitting Catalyzed by Dinitrosyl Iron Complex." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6kcgkb.

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Deng, Xiaohui. "Photocatalytic and Photoelectrochemical Water Splitting by Inorganic Materials." Thesis, 2012. http://hdl.handle.net/10754/255086.

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Hydrogen has been identified as a potential energy carrier due to its high energy capacity and environmental harmlessness. Compared with hydrogen production from hydrocarbons such as methane and naphtha in a conventional hydrogen energy system, photocatalytic hydrogen evolution from water splitting offers a more economic approach since it utilizes the abundant solar irradiation as energy source and water as initial reactant. Powder photocatalyst, which generates electrons and holes under illumination, is the origin where the overall reaction happens. High solar energy conversion efficiency especially from visible range is commonly the target. Besides, cocatalyst for hydrogen and oxygen evolution is also playing an essential role in facilitating the charge separation and enhancing the kinetics. In this thesis, the objective is to achieve high energy conversion efficiency towards water splitting from diverse aspects. The third chapter focuses on a controllable method to fabricate metal pattern, which is candidate for hydrogen evolution cocatalyst while chapter 4 is on the combination of strontium titanium oxide (SrTiO3) with graphene oxide (GO) for a better photocatalytic performance. In the last chapter, photoelectrochemical water splitting by Ta3N5 photoanode and FeOOH as a novel oxygen evolution cocatalyst has been investigated.
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GunawanIp and 葉燊寶. "Investigations on GaN-ZnO and Diode-type Photocatalysts for Overall Water Splitting." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32111502132288925839.

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碩士
國立成功大學
化學工程學系碩博士班
100
Developing a new kind of visible light water splitting photocatalyst is a new challenge for the development of renewable energy utilization by employing water splitting process. GaN-ZnO solid solution photocatalyst has been known as a visible light photocatalyst with suitable band position for water splitting reaction. The addition of Zn into Ga2O3 as a starting material for GaN-ZnO is considered as a new way to improve the photocatalytic activity for GaN-ZnO. The main purpose for loading Zn into Ga2O3 is to prevent the photocatalyst to be fully converted into GaN at niridation process. This method has been proved in this experiment to be successful for increasing Zn/Ga ratio in final product and also increasing the H2 and O2 gas evolution rate of GaN-ZnO photocatalyst. GaN-ZnO photocatalyst from 2% Zn loaded Ga2O3 shows higher H2 (181.21 micromol/h) and O2 evolution (49.11 micromol/h) compared with the same photocatalyst from commercial Ga2O3. In the second part of this study, junction photocatalyst consists of p-type photocatalyst, n-type photocatalyst, and noble metal in between was made. Two different junction photocatalysts have been made which are Cu2O/Au/WO3 and Ag2O/Ag/WO3. For Cu2O/Au/WO3 photocatalyst, Cu2O photodeposition pH is varied to get the junction photocatalyst with the best activity. The result shows that Cu2O/Au/WO3 photocatalyst with the best performance is the photocatalyst which was synthesized at pH = 8.2. Too low photodeposition pH will make Cu2O can’t be well deposited. On the contrary, too high photodeposition pH will cause some of the WO3 to be dissolved and interfere with photodeposition process. For another junction photocatalyst, Ag2O/Ag/WO3, the amount of total Ag loaded into WO3 is varied. The result shows that Ag2O/Ag/WO3 junction photocatalyst with the ratio of Ag to WO3 = 1 : 2 gives the highest activity, even with the termination of O2 evolution after 20 hours of irradiation. Addition of more Ag into WO3 caused Ag overloading which make the photocatalyst quickly covered with Ag and lost its activity. Meanwhile, termination of O2 evolution could be caused by redeposition of Ag which covers WO3 active site.
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Book chapters on the topic "Overall water splitting"

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Martin, David James. "Novel Z-Scheme Overall Water Splitting Systems." In Springer Theses, 123–43. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18488-3_5.

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Townsend, Troy K., Nigel Browning, and Frank E. Osterloh. "Overall Photocatalytic Water Splitting with Suspended NiO-SrTiO3 Nanocrystals." In Inorganic Metal Oxide Nanocrystal Photocatalysts for Solar Fuel Generation from Water, 39–51. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05242-7_4.

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Maeda, Kazuhiko, Tsuyoshi Takata, and Kazunari Domen. "(Oxy)nitrides and Oxysulfides as Visible-Light-Driven Photocatalysts for Overall Water Splitting." In Energy Efficiency and Renewable Energy Through Nanotechnology, 487–529. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-638-2_14.

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Maeda, Kazuhiko, and Kazunari Domen. "Chapter 12 Nano-particulate photocatalysts for overall water splitting under visible light." In Nanomaterials: Design and Simulation, 301–15. Elsevier, 2007. http://dx.doi.org/10.1016/s1380-7323(06)80014-2.

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Domen, Kazunari, Shigeru Ikeda, Tsuyoshi Takata, Akira Tanaka, Michikazu Hara, and Junko N. Kondo. "Mechano-catalytic overall water-splitting into hydrogen and oxygen on some metal oxides." In Energy Systems, 159–79. Elsevier, 2000. http://dx.doi.org/10.1016/b978-0-08-043877-1.50012-7.

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Yohan, Park, Hisatomi Takashi, and Domen Kazunari. "Progress in fundamental studies and practical applications of SrTiO3 photocatalysts to overall water splitting." In Current Developments in Photocatalysis and Photocatalytic Materials, 141–57. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-819000-5.00010-2.

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Ikeda, Shigeru, Akira Tanaka, Hideo Hosono, Hiroshi Kawazoe, Michikazu Hara, Junko N. Kondo, and Kazunari Domen. "Overall water splitting on Cu(l)-containing ternary oxides, CuMO2(M&dbn;;Fe, Ga, Al) with delafossite structure." In Science and Technology in Catalysis 1998, Proceedings of the Third Tokyo Conference on Advanced Catalytic Science and Technology, 301–4. Elsevier, 1999. http://dx.doi.org/10.1016/s0167-2991(99)80083-4.

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Conference papers on the topic "Overall water splitting"

1

Domen, Kazunari. "Overall water splitting on (oxy)nitride photocatalysts." In Solar Energy + Applications, edited by Gunnar Westin. SPIE, 2008. http://dx.doi.org/10.1117/12.798334.

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Kibria, M. G., F. A. Chowdhury, H. P. T. Nguyen, S. Zhao, and Z. Mi. "Overall Water Splitting under Broadband Light Using InGaN/GaN Nanowire Heterostructures." In 2014 IEEE Photonics Society Summer Topical Meeting Series. IEEE, 2014. http://dx.doi.org/10.1109/sum.2014.17.

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Hisatomi, Takashi, and Kazunari Domen. "Recent progress in photocatalysts for overall water splitting under visible light." In SPIE Solar Energy + Technology, edited by Frank E. Osterloh. SPIE, 2009. http://dx.doi.org/10.1117/12.829992.

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"CoMo2S4/MoS2 Heterostructure with High Catalytic Performance for Overall Water Splitting in Alkaline Medium." In 2018 International Conference on Medicine, Biology, Materials and Manufacturing. Francis Academic Press, 2018. http://dx.doi.org/10.25236/icmbmm.2018.47.

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O’Brien, J. E. "Thermodynamic Considerations for Thermal Water Splitting Processes and High Temperature Electrolysis." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68880.

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A general thermodynamic analysis of hydrogen production based on thermal water splitting processes is presented. Results of the analysis show that the overall efficiency of any thermal water splitting process operating between two temperature limits is proportional to the Carnot efficiency. Implications of thermodynamic efficiency limits and the impacts of loss mechanisms and operating conditions are discussed as they pertain specifically to hydrogen production based on high-temperature electrolysis. Overall system performance predictions are also presented for high-temperature electrolysis plants powered by three different advanced nuclear reactor types, over their respective operating temperature ranges.
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Osterloh, Frank, Zeqiong Zhao, Renato Gonçalves, Muhammad Huda, Sajib Barman, Emma Willard, Russell Perry, and Edaan Byle. "Electronic Structure Basis for Enhanced Overall Water Splitting Photocatalysis of Doped Strontium Titanate in Direct Sunlight." In nanoGe Fall Meeting 2018. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.fallmeeting.2018.024.

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T-Raissi, Ali, Nazim Z. Muradov, Cunping Huang, Olawale Adebiyi, Robin W. Taylor, and Roger L. Davenport. "Hydrogen From Solar Via Light-Assisted High-Temperature Water-Splitting Cycles." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76021.

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Hydrogen production from solar-driven thermochemical water splitting cycles (TCWSCs) provides an approach that is energy efficient and environmentally attractive. Of particular interest are TCWSCs that utilize both thermal (i.e. high temperature) and light (i.e. quantum) components of the solar resource, boosting the overall solar-to-hydrogen conversion efficiency compared to those with heat-only energy input. We have analyzed two solar-driven TCWSCs: 1) carbon dioxide (CO2)/carbon monoxide cycle; and 2) sulfur dioxide (SO2)/sulfuric acid cycle. The first cycle is based on the premise that CO2 becomes susceptible to near-ultraviolet and even visible radiation at high temperatures (greater than 1300K). The second cycle is a modification of the well-known Westinghouse hybrid cycle, wherein the electrochemical step is replaced by a photocatalytic step. At the Florida Solar Energy Center (FSEC), a novel hybrid photo-thermochemical sulfur-ammonia (S-A) cycle has been developed. The main reaction (unique to FSEC’s S-A cycle) is the light-induced photocatalytic production of hydrogen and ammonium sulfate from an aqueous ammonium sulfite solution. Ammonium sulfate product is processed to generate oxygen and recover ammonia and SO2 that are then recycled and reacted with water to regenerate the ammonium sulfite. Experimental data for verification of the concept are provided.
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Holzemer-Zerhusen, Philipp, Stefan Brendelberger, Martin Roeb, and Christian Sattler. "Oxygen Crossover in Solid-Solid Heat Exchangers for Solar Water and Carbon Dioxide Splitting: A Thermodynamic Analysis." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1608.

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Abstract In solar thermochemical redox cycles for H2O/CO2-splitting, a large portion of the overall energy demand of the system is associated with heating the redox material from the oxidation temperature to the reduction temperature. Hence, an important measure to improve the efficiency is recuperation of sensible heat stored in the redox material. A solid-solid heat exchanger can be subject to undesirable oxygen crossover, which decreases the oxygen uptake capacity of the redox material and consequently the system efficiency. We investigate the extent of this crossover in ceria based cycles, to identify, under which conditions a heat exchanger that allows oxygen crossover can improve the system efficiency. In a thermodynamic analysis we calculate the amount of transferred oxygen as a function of the heat exchanger efficiency and show the system efficiency of such a concept. A second law analysis is applied to the model to check the feasibility of calculated points of operation. For the investigated parameter set the heat exchanger design improves the system efficiency by a factor of up to 2.1.
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Tracy, T., J. C. Ordonez, and J. V. C. Vargas. "First and Second Law Thermodynamic Analysis of a Domestic Scale Trigeneration System." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36184.

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The potential use of small-scale trigeneration systems in domestic homes, especially for emergency use in the event of a hurricane or natural disaster where electricity and useful power are at a premium, is increasing. They have the ability to produce both useful thermal energy and electricity from a single source of fuel such as gasoline, natural gas, or other alternate fuel. However, small-scale systems present some technological challenges in order to achieve a significant increase in efficiency over conventional systems. This paper addresses the fundamental question of the splitting of a hot exhaust into two heat recovery heat exchangers that are part of a trigeneration system. We consider a system which produces electricity, refrigeration, and hot water by recovering waste energy from a reciprocating internal combustion engine. First and second law analyses were performed on the refrigerator and water heating heat exchangers and on the overall system. An optimal splitting of the available hot exhaust stream between the refrigerator and the hot water heat exchangers is identified. The thermodynamic optima is sharp and robust with respect to the variation of refrigerant and water inlet temperatures.
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Wullenkord, Michael, Christian Jung, and Christian Sattler. "Development of a Concentrator With a Rectangular Flat Focus Used for Hydrogen Production via Photocatalytic Water Splitting Employing Solar Radiation." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91441.

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Hydrogen is a promising energy carrier. A carbon-free option to produce hydrogen is the photocatalytic splitting of water, when solar radiation provides the photons needed for the reaction. The DLR develops a test bed to assess the activity of potential catalysts either in suspensions or in fixed-bed electrochemical cells under practical sun-light conditions, concentrated by a factor up to 20. A rectangular flat focus is required in order to guarantee a homogeneous distribution of concentrated radiation on the planar receiver plate, where the light enters the receiver. A low deviation of irradiation on the receiver plate promotes a reliable evaluation of the catalysts’ efficiency and quantum yields. This paper is focused on the development of a suitable concentrator concept. A concentrator/receiver-concept featuring a homogeneous distribution of radiation on the reactor surface was chosen after analyzing different options by means of a ray tracing tool. The favorite concept employs a 2-axis modified linear Fresnel collector. The overall dimensions were determined taking the optical properties of the irradiated surface of the reactor into account. A limitation of the angle of incidence ensures that only a marginal fraction of the radiation is lost due to reflection on the irradiated surface of the reactor.
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