scholarly journals Oxygen-vacancy-induced photoelectrochemical water oxidation by platelike tungsten oxide photoanodes prepared under acid-mediated hydrothermal treatment conditions

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 26992-27000 ◽  
Author(s):  
Mohammad Hassan Mirfasih ◽  
Changli Li ◽  
Ahmad Tayyebi ◽  
Qi Cao ◽  
Jun Yu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Tungsten Oxide ◽  
Hydrothermal Treatment ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Treatment Conditions ◽  
Photoelectrochemical Water Oxidation

Increased beneficial oxygen vacancies density is yielded in WO3 photoanodes by calcination of WO3·2H2O rather than WO3·H2O.

Defective ZnFe2O4 nanorods with oxygen vacancy for photoelectrochemical water splitting

Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 19144-19151 ◽  
Author(s):  
Ju Hun Kim ◽  
Youn Jeong Jang ◽  
Jin Hyun Kim ◽  
Ji-Wook Jang ◽  
Sun Hee Choi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Oxygen Vacancy ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Electron Donors ◽  
Surface Trap ◽  
Oxidation Activity ◽  
Vacuum Atmosphere ◽  
Photoelectrochemical Water Oxidation

A 1D ZnFe2O4 photoanode is treated under a hydrogen or vacuum atmosphere to improve the photoelectrochemical water oxidation activity up to 20 times. This post-treatment creates oxygen vacancies in the ZnFe2O4 lattice that serve as a source of electron donors and passivates surface trap sites, and as a result improves charge transfer.

A high-performance silicon photoanode enabled by oxygen vacancy modulation on NiOOH electrocatalyst for water oxidation

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7550-7556 ◽  
Author(s):  
Qian Cai ◽  
Wenting Hong ◽  
Chuanyong Jian ◽  
Wei Liu
Keyword(s):  
Oxygen Vacancy ◽  
Water Oxidation ◽  
High Performance ◽  
Oxygen Vacancies ◽  
Co Catalyst

NiFe nanoparticles which are deposited onto the n-Si/Ni/NiOOH photoanode surface lead to high OER performance by acting as a co-catalyst and creating oxygen vacancies.

Determining the Role of Oxygen Vacancies in the Photocatalytic Performance of WO3 for Water Oxidation

2019 ◽  
Author(s):  
Sacha Corby ◽  
Laia Francàs ◽  
Andreas Kafizas ◽  
James R Durrant
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Photoelectrochemical Performance ◽  
Solar Water Splitting ◽  
The Impact ◽  
Recombination Kinetics ◽  
Vacancy Concentrations

Oxygen vacancies are common to most metal oxides, whether intentionally incorporated or otherwise, and the study of these defects is of increasing interest for solar water splitting. In this work, we examine nanostructured WO<sub>3</sub> photoanodes of varying oxygen content to determine how the concentration of bulk oxygen-vacancy states affects the photocatalytic performance for water oxidation. Using transient optical spectroscopy, we follow the charge carrier recombination kinetics in these samples, from picoseconds to seconds, and examine how differing oxygen vacancy concentrations impact upon these kinetics. We find that samples with an intermediate concentration of vacancies (~2% of oxygen atoms) afford the greatest photoinduced charge carrier densities, and the slowest recombination kinetics across all timescales studied. This increased yield of photogenerated charges correlates with improved photocurrent densities under simulated sunlight, with both greater and lesser oxygen vacancy concentrations resulting in enhanced recombination losses and poorer J-V performances. Our conclusion, that an optimal – neither too high nor too low – concentration of oxygen vacancies is required for optimum photoelectrochemical performance, is discussed in terms of the impact of these defects on charge separation and transport, as well as the implications held for other highly doped materials for photoelectrochemical water oxidation.

Insights into the multiple effects of oxygen vacancies on CuWO4 for photoelectrochemical water oxidation

2020 ◽  
Vol 10 (21) ◽  
pp. 7344-7351
Author(s):  
Wenlong Guo ◽  
Ya Wang ◽  
Xin Lian ◽  
Yao Nie ◽  
Shijia Tian ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxygen Vacancies ◽  
Charge Recombination ◽  
Transfer Time ◽  
Photoelectrochemical Water Oxidation

For CuWO4, oxygen vacancies can shorten the electron transfer time and boost the water oxidation kinetics, but they aggravate the charge recombination on the surface.

Oxygen vacancy engineering with flame heating approach towards enhanced photoelectrochemical water oxidation on WO3 photoanode

Nano Energy ◽  
2020 ◽  
Vol 77 ◽  
pp. 105190
Author(s):  
Chenyi Shao ◽  
Anum Shahid Malik ◽  
Jingfeng Han ◽  
Deng Li ◽  
Michel Dupuis ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Water Oxidation ◽  
Flame Heating ◽  
Photoelectrochemical Water Oxidation

Photoelectrochemical water oxidation using a Bi2MoO6/MoO3 heterojunction photoanode synthesised by hydrothermal treatment of an anodised MoO3 thin film

2016 ◽  
Vol 4 (18) ◽  
pp. 6964-6971 ◽  
Author(s):  
Shi Nee Lou ◽  
Jason Scott ◽  
Akihide Iwase ◽  
Rose Amal ◽  
Yun Hau Ng
Keyword(s):  
Thin Film ◽  
Hydrothermal Treatment ◽  
Conversion Efficiency ◽  
Water Oxidation ◽  
Photoelectrochemical Water Oxidation

A photoactive Bi2MoO6/MoO3 heterojunction electrode derived from a direct thin-film-route showed close to 100% faradic photocurrent-to-O2 conversion efficiency.

Modulating oxygen vacancies in Sn-doped hematite film grown on silicon microwires for photoelectrochemical water oxidation

2018 ◽  
Vol 6 (32) ◽  
pp. 15593-15602 ◽  
Author(s):  
Zhongyuan Zhou ◽  
Shaolong Wu ◽  
Linling Qin ◽  
Liang Li ◽  
Liujing Li ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Silicon Microwires ◽  
Photoelectrochemical Water Oxidation

Dual-absorber photoelectrodes are attractive candidates for solar water splitting due to their broadened absorption spectrum and improved photovoltage compared to single-absorber systems.

Determining the Role of Oxygen Vacancies in the Photocatalytic Performance of WO3 for Water Oxidation

2019 ◽  
Author(s):  
Sacha Corby ◽  
Laia Francàs ◽  
Andreas Kafizas ◽  
James R Durrant
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Photoelectrochemical Performance ◽  
Solar Water Splitting ◽  
The Impact ◽  
Recombination Kinetics ◽  
Vacancy Concentrations

Oxygen vacancies are common to most metal oxides, whether intentionally incorporated or otherwise, and the study of these defects is of increasing interest for solar water splitting. In this work, we examine nanostructured WO<sub>3</sub> photoanodes of varying oxygen content to determine how the concentration of bulk oxygen-vacancy states affects the photocatalytic performance for water oxidation. Using transient optical spectroscopy, we follow the charge carrier recombination kinetics in these samples, from picoseconds to seconds, and examine how differing oxygen vacancy concentrations impact upon these kinetics. We find that samples with an intermediate concentration of vacancies (~2% of oxygen atoms) afford the greatest photoinduced charge carrier densities, and the slowest recombination kinetics across all timescales studied. This increased yield of photogenerated charges correlates with improved photocurrent densities under simulated sunlight, with both greater and lesser oxygen vacancy concentrations resulting in enhanced recombination losses and poorer J-V performances. Our conclusion, that an optimal – neither too high nor too low – concentration of oxygen vacancies is required for optimum photoelectrochemical performance, is discussed in terms of the impact of these defects on charge separation and transport, as well as the implications held for other highly doped materials for photoelectrochemical water oxidation.

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