scholarly journals Water splitting with polyoxometalate-treated photoanodes: enhancing performance through sensitizer design

2015 ◽  
Vol 6 (10) ◽  
pp. 5531-5543 ◽  
Author(s):  
John Fielden ◽  
Jordan M. Sumliner ◽  
Nannan Han ◽  
Yurii V. Geletii ◽  
Xu Xiang ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Dye Sensitized ◽  
Visible Light Driven

Improved sensitizer design dramatically enhances visible light-driven water oxidation from dye-sensitized TiO2 photoanodes treated with polyoxometalate water oxidation catalyst [{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2]10−.

scholarly journals Au decorated BiVO4 inverse opal for efficient visible light driven water oxidation

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8751-8758
Author(s):  
Xiaonong Wang ◽  
Xiaoxia Li ◽  
Jingxiang Low
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Water Oxidation ◽  
Inverse Opal ◽  
Photocatalytic Water Splitting ◽  
Visible Light Driven

Photocatalytic water splitting provides an effective way to prepare hydrogen and oxygen.

Visible light-driven novel g-C3N4/NiFe-LDH composite photocatalyst with enhanced photocatalytic activity towards water oxidation and reduction reaction

2015 ◽  
Vol 3 (36) ◽  
pp. 18622-18635 ◽  
Author(s):  
Susanginee Nayak ◽  
Lagnamayee Mohapatra ◽  
Kulamani Parida
Keyword(s):  
Photocatalytic Activity ◽  
Composite Materials ◽  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
Reduction Reaction ◽  
Light Irradiation ◽  
Composite Photocatalyst ◽  
Visible Light Driven

Dispersion of exfoliated CN over the surface of exfoliated LDH composite materials, and its photocatalytic water splitting under visible-light irradiation.

scholarly journals Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yong Zhu ◽  
Degao Wang ◽  
Qing Huang ◽  
Jian Du ◽  
Licheng Sun ◽  
...  
Keyword(s):  
Water Splitting ◽  
Phosphonic Acid ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Molecular Water ◽  
Applied Bias ◽  
Surface Loading ◽  
Dye Sensitized ◽  
Monomeric Structure ◽  
Molecular Catalysts

Abstract Understanding and controlling the properties of water-splitting assemblies in dye-sensitized photoelectrosynthesis cells is a key to the exploitation of their properties. We demonstrate here that, following surface loading of a [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) chromophore on nanoparticle electrodes, addition of the molecular catalysts, Ru(bda)(L)2 (bda  =  2,2′-bipyridine-6,6′-dicarboxylate) with phosphonate or pyridyl sites for water oxidation, gives surfaces with a 5:1 chromophore to catalyst ratio. Addition of the surface-bound phosphonate derivatives with L = 4-pyridyl phosphonic acid or diethyl 3-(pyridin-4-yloxy)decyl-phosphonic acid, leads to well-defined surfaces but, following oxidation to Ru(III), they undergo facile, on-surface dimerization to give surface-bound, oxo-bridged dimers. The dimers have a diminished reactivity toward water oxidation compared to related monomers in solution. By contrast, immobilization of the Ru-bda catalyst on TiO2 with the 4,4′-dipyridyl anchoring ligand can maintain the monomeric structure of catalyst and gives relatively stable photoanodes with photocurrents that reach to 1.7 mA cm−2 with an optimized, applied bias photon-to-current efficiency of 1.5%.

A wide visible light driven complex perovskite Ba(Mg1/3Ta2/3)O3−xNy photocatalyst for water oxidation and reduction

2017 ◽  
Vol 5 (35) ◽  
pp. 18870-18877 ◽  
Author(s):  
Junyan Cui ◽  
Taifeng Liu ◽  
Yu Qi ◽  
Dan Zhao ◽  
Mingjun Jia ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Absorption Edge ◽  
Water Oxidation ◽  
Complex Perovskite ◽  
Nitrogen Doped ◽  
Solar Water Splitting ◽  
Visible Light Driven

A new nitrogen-doped metal oxide photocatalyst Ba(Mg1/3Ta2/3)O3−xNy (BMTON) with an absorption edge of ca. 560 nm was synthesized, showing obvious H2 or O2-evolution half reaction activities under visible light irradiation for promising solar water splitting.

scholarly journals An Artificial Z-Scheme Constructed from Dye-Sensitized Metal Oxide Nanosheets for Visible Light-Driven Overall Water Splitting

2020 ◽  
Vol 142 (18) ◽  
pp. 8412-8420 ◽  
Author(s):  
Takayoshi Oshima ◽  
Shunta Nishioka ◽  
Yuka Kikuchi ◽  
Shota Hirai ◽  
Kei-ichi Yanagisawa ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Water Splitting ◽  
Dye Sensitized ◽  
Overall Water Splitting ◽  
Visible Light Driven

scholarly journals Visible light-driven water oxidation using a covalently-linked molecular catalyst–sensitizer dyad assembled on a TiO2 electrode

2016 ◽  
Vol 7 (2) ◽  
pp. 1430-1439 ◽  
Author(s):  
Masanori Yamamoto ◽  
Lei Wang ◽  
Fusheng Li ◽  
Takashi Fukushima ◽  
Koji Tanaka ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Ruthenium Complex ◽  
Oxidation Catalyst ◽  
Tio2 Electrode ◽  
Molecular Catalyst ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Artificial Photosynthetic ◽  
Covalently Linked

The combination of porphyrin as a sensitizer and a ruthenium complex as a water oxidation catalyst (WOC) is promising to exploit highly efficient molecular artificial photosynthetic systems.

New strategy to incorporate nano-particle sized water oxidation catalyst into dye-sensitized photoelectrochemical cell for water splitting

2016 ◽  
Vol 25 (3) ◽  
pp. 345-348 ◽  
Author(s):  
Peicheng Wei ◽  
Bo Hu ◽  
Li Zhou ◽  
Ting Su ◽  
Yong Na
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Photoelectrochemical Cell ◽  
Oxidation Catalyst ◽  
Nano Particle ◽  
Dye Sensitized ◽  
New Strategy

A visible light water-splitting cell with a photoanode formed by codeposition of a high-potential porphyrin and an iridium water-oxidation catalyst

2011 ◽  
Vol 4 (7) ◽  
pp. 2389 ◽  
Author(s):  
Gary F. Moore ◽  
James D. Blakemore ◽  
Rebecca L. Milot ◽  
Jonathan F. Hull ◽  
Hee-eun Song ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Water Oxidation ◽  
High Potential ◽  
Oxidation Catalyst ◽  
Light Water

Nanoporous Ta3N5via electrochemical anodization followed by nitridation for solar water oxidation

2020 ◽  
Vol 49 (42) ◽  
pp. 15023-15033
Author(s):  
Pran Krisna Das ◽  
Maheswari Arunachalam ◽  
Kanase Rohini Subhash ◽  
Young Jun Seo ◽  
Kwang-Soon Ahn ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Water Splitting ◽  
Water Oxidation ◽  
Narrow Band ◽  
Tantalum Nitride ◽  
Electrochemical Anodization ◽  
Visible Light Driven ◽  
Solar Water Oxidation ◽  
Pec Water Splitting

Nanoporous tantalum nitride (Ta3N5) is a promising visible-light-driven photoanode for photoelectrochemical (PEC) water splitting with a narrow band gap of approximately 2.0 eV.

(Invited) Visible Light-Driven Water Oxidation with Porphyrin Sensitizers and Water Oxidation Catalysts

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1852-1852
Author(s):  
Hiroshi Imahori
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Water Oxidation ◽  
Light Harvesting ◽  
Visible Region ◽  
Oxidation Catalyst ◽  
Efficient Production ◽  
Oxidation Catalysts ◽  
Visible Light Driven ◽  
Artificial Photosynthetic

Exporing renewable energy sources is an important task in making our society sustainable. In this regard, use of sunlight as an infinite energy source is fascinating. Specifically, realizing artificial photosynthesis, i.e., integration of light-harvesting, multi-step electron and proton transfer, and water oxidation for the efficient production of solar fuels, is a great challenge in chemistry. For the purpose, dye-sensitized photoelectrosynthesis cells (DSPSC) have been investigated, as the heterogeneous water splitting on inorganic semiconductors is promising for the upcoming large scale device operation. In DSPSC a molecular sensitizer adsorbed on a semiconducting electrode harvests visible light and injects an electron from the excited-state of the sensitizer (S*) to a conduction band (CB) of the electrode. Then, the sensitizer radical cation (S• +) extracts an electron from a water oxidation catalyst (WOC) to regenerate the sensitizer and one-electron oxidized WOC. After reiterating the cycle, high oxidation states of the WOC are produced, eventually transforming two water molecules into four protons and one oxygen molecule. As the sensitizer bis(2,2’-bipyridine)(4,4’-diphosphonato-2,2’-bipyridine)ruthenium(II) (RuP) has been frequently employed for the construction of molecule-based artificial photosynthetic systems, owing to its sufficient first oxidation potential for water oxidation and a long lifetime of its excited state for electron injection. However, the light-harvesting ability of RuP is rather low in visible region beyond 500 nm. Considering that yellow to red photons mainly shower down on the earth from sun, use of photons in visible region is essential for efficient chemical conversion by sunlight. In this context, porphyrins are attractive as the sensitizer due to their excellent light-harvesting in visible region and facile tuning of their excited-states and redox properties by their chemical functionalization. Nevertheless, molecule-based artificial photosynthetic systems with porphyrins as the sensitizer have been very limited as the result of their poor performance. One plausible reason is the occurrence of fast charge recombination (CR) between the electron injected into the CB of TiO2 (denoted as TiO2(e−)) and S• +. CR from TiO2(e−) to the oxidized WOC would also take place within a few microsecond. Undesirable CR from TiO2(e−) to water is indicated. Thus, to overcome the disadvantages, it is crucial to optimize the electron transfer (ET) processes at the interfaces. In this talk, I will give an overview of our recent initiatives on visible light-driven water oxidation with novel porphyrin sensitizers and water oxidation catalysts. [1] M. Yamamoto, L. Wang, F. Li, T. Fukushima, K. Tanaka, L. Sun and H. Imahori, Chem. Sci., 7, 1430-1439 (2016). [2] M. Yamamoto, Y. Nishizawa, P. Chábera, F. Li, T. Pascher, V. Sundström, L. Sun, and H. Imahori, Chem. Commun., 52, 13702-13705 (2016). [3] M. Yamamoto, J. Föhlinger, J. Petersson, L. Hammarström, and H. Imahori, Angew. Chem. Int. Ed., 56, 3329-3333 (2017).

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