Modified Ta3N5Powder as a Photocatalyst for O2Evolution in a Two-Step Water Splitting System with an Iodate/Iodide Shuttle Redox Mediator under Visible Light

Langmuir ◽  
2010 ◽  
Vol 26 (12) ◽  
pp. 9161-9165 ◽  
Author(s):  
Masashi Tabata ◽  
Kazuhiko Maeda ◽  
Masanobu Higashi ◽  
Daling Lu ◽  
Tsuyoshi Takata ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Redox Mediator ◽  
Splitting System

Photocatalytic water splitting employing a [Fe(CN)6]3−/4− redox mediator under visible light

2019 ◽  
Vol 9 (8) ◽  
pp. 2019-2024 ◽  
Author(s):  
Yugo Miseki ◽  
Kazuhiro Sayama
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Redox Mediator ◽  
Photocatalytic Water Splitting ◽  
Surface Modified

Surface-modified WO3, as an oxygen evolution photocatalyst for Z-scheme water splitting employing a [Fe(CN)6]3−/4− redox mediator, is successfully constructed.

scholarly journals Manganese‐Substituted Polyoxometalate as an Effective Shuttle Redox Mediator in Z‐Scheme Water Splitting under Visible Light

ChemSusChem ◽  
2016 ◽  
Vol 9 (16) ◽  
pp. 2201-2208 ◽  
Author(s):  
Kohei Tsuji ◽  
Osamu Tomita ◽  
Masanobu Higashi ◽  
Ryu Abe
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Redox Mediator

Mono-Transition-Metal-substituted Polyoxometalates as Shuttle Redox Mediator for Z-scheme Water Splitting under Visible Light

2021 ◽  
Author(s):  
Osamu Tomita ◽  
Hiroki Naito ◽  
Akinobu Nakada ◽  
Masanobu Higashi ◽  
Ryu Abe
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Visible Light ◽  
Water Splitting ◽  
Redox Mediator

Because the majority of Z-scheme water splitting systems employ a shuttle redox mediator that allows electron transfer between two photocatalyst materials, the development of an effective redox mediator is crucial...

Efficient Redox-Mediator-Free Z-Scheme Water Splitting Employing Oxysulfide Photocatalysts under Visible Light

ACS Catalysis ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1690-1696 ◽  
Author(s):  
Song Sun ◽  
Takashi Hisatomi ◽  
Qian Wang ◽  
Shanshan Chen ◽  
Guijun Ma ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Redox Mediator

Solar Hydrogen Production: Direct Water Splitting Into Hydrogen and Oxygen by New Photocatalysts Under Visible Light Irradiation

Solar Energy ◽  
2003 ◽  
Author(s):  
Hironori Arakawa ◽  
Zhigang Zou ◽  
Kazuhiro Sayama ◽  
Ryu Abe
Keyword(s):  
Quantum Yield ◽  
Solar Energy ◽  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production ◽  
Natural Photosynthesis ◽  
Splitting System

The photocatalytic splitting of water into hydrogen and oxygen using solar energy is one of the most attractive renewable sources of hydrogen fuel. Therefore, considerable efforts have been paid in developing photocatalysts capable of using visible light, which accounts for about 43% of the solar energy. However such a photocatalyst has not been developed so far. We have developed a new Ni-doped indium-tantalum oxide photocatalyst, In1-xNixTaO4 (x = 0.0∼0.2), which induced direct splitting of water into stoichiometric amount of oxygen and hydrogen under visible light irradiation with a quantum yield of about 0.66% at 420.7 nm. We have also developed a new two-step water splitting system using two different semiconductor photocatalysts, Pt/WO3 photocatalyst for oxygen evolution and Pt/SrTiO3(Cr-Ta-doped) photocatalyst for hydrogen evolution, and a redox mediator, I−/IO3−, mimicking the Z-scheme mechanism of the natural photosynthesis. The quantum yield of this system was about 0.1% at 420.7nm. Both photocatalytic methods are the first examples for visible light water splitting system in the world.

Dye-Sensitized Photocatalyst System for Water Splitting Into H2 and O2 Under Visible Light Irradiation

Solar Energy ◽  
2004 ◽  
Author(s):  
Ryu Abe ◽  
Kazuhiro Sayama ◽  
Hironori Arakawa
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Energy Gap ◽  
H2 Production ◽  
Light Irradiation ◽  
Mixed Solution ◽  
Tio2 Photocatalysts ◽  
Dye Sensitized ◽  
Splitting System

H2 production from a water-acetonitrile mixed solution containing iodide electron donor was investigated over dye-sensitized Pt/TiO2 photocatalysts under visible light irradiation, as a part of water splitting system using iodide redox mediator. The rates of H2 evolution were decreased with the increase of the water ratio in the mixed solutions, because of the decrease in energy gap between the redox potential of I3−/I− and the HOMO levels of the dyes, which lowing the efficiency of electron transfer from I− to dye.

scholarly journals Recent Developments in the Use of Heterogeneous Semiconductor Photocatalyst Based Materials for a Visible-Light-Induced Water-Splitting System—A Brief Review

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 160
Author(s):  
Prabhakarn Arunachalam ◽  
Keiji Nagai ◽  
Mabrook S. Amer ◽  
Mohamed A. Ghanem ◽  
Rajabathar Jothi Ramalingam ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Water Oxidation ◽  
Electrode Materials ◽  
Oxide Electrodes ◽  
Recent Developments ◽  
Visible Light Driven ◽  
Difficult Challenge ◽  
Splitting System ◽  
Pec Water Splitting

Visible-light-driven photoelectrochemical (PEC) and photocatalytic water splitting systems featuring heterogeneous semiconductor photocatalysts (oxynitrides, oxysulfides, organophotocatalysts) signify an environmentally friendly and promising approach for the manufacturing of renewable hydrogen fuel. Semiconducting electrode materials as the main constituents in the PEC water splitting system have substantial effects on the device’s solar-to-hydrogen (STH) conversion efficiency. Given the complication of the photocatalysis and photoelectrolysis methods, it is indispensable to include the different electrocatalytic materials for advancing visible-light-driven water splitting, considered a difficult challenge. Heterogeneous semiconductor-based materials with narrower bandgaps (2.5 to 1.9 eV), equivalent to the theoretical STH efficiencies ranging from 9.3% to 20.9%, are recognized as new types of photoabsorbents to engage as photoelectrodes for PEC water oxidation and have fascinated much consideration. Herein, we spotlight mainly on heterogenous semiconductor-based photoanode materials for PEC water splitting. Different heterogeneous photocatalysts based materials are emphasized in different groups, such as oxynitrides, oxysulfides, and organic solids. Lastly, the design approach and future developments regarding heterogeneous photocatalysts oxide electrodes for PEC applications and photocatalytic applications are also discussed.

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