Engineering Oxygen Vacancies in Mesocrystalline CuO Nanosheets for Water Oxidation

2021 ◽  
Author(s):  
Linfeng Liang ◽  
Ke-Yu Niu ◽  
Linjie Zhang ◽  
Jiayue Tian ◽  
Kang Zhou ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Cuo Nanosheets

Hydrogenated CeO2−xSx mesoporous hollow spheres for enhanced solar driven water oxidation

2016 ◽  
Vol 52 (12) ◽  
pp. 2521-2524 ◽  
Author(s):  
Yuting Xiao ◽  
Yajie Chen ◽  
Ying Xie ◽  
Guohui Tian ◽  
Shien Guo ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Band Gap ◽  
Carrier Concentration ◽  
Water Oxidation ◽  
Doping Level ◽  
Oxygen Vacancies ◽  
Narrow Band ◽  
Hollow Spheres ◽  
Sulfur Doping

Hydrogenated CeO2−xSx mesoporous hollow spheres were prepared and exhibited much higher rates of O2 evolution than CeO2 and CeO2−xSx due to the synergistic effect of high sulfur doping level, narrow band gap, moderate oxygen vacancies and higher carrier concentration.

Mn dopant induced high-valence Ni3+ sites and oxygen vacancies for enhanced water oxidation

2020 ◽  
Vol 4 (7) ◽  
pp. 1993-1999
Author(s):  
Yu Zhang ◽  
Zhiyuan Zeng ◽  
Derek Ho
Keyword(s):  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Mn Dopant

Mn is demostrated as a superior dopant for oxide nanosheets, showing significantly enhanced OER activity.

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.

Ultrathin NiCo2O4 nanosheets with dual-metal active sites for enhanced solar water splitting of a BiVO4 photoanode

2019 ◽  
Vol 7 (39) ◽  
pp. 22274-22278 ◽  
Author(s):  
Chenchen Feng ◽  
Qi Zhou ◽  
Bin Zheng ◽  
Xiang Cheng ◽  
Yajun Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Highly Efficient ◽  
Dual Metal ◽  
Nico2o4 Nanosheets ◽  
First Time

Spinel-structured NiCo2O4 nanosheets with dual-metal active sites, an ultrathin structure, and abundant oxygen vacancies were decorated for the first time on a BiVO4 photoanode for highly efficient PEC water oxidation.

Introduction of oxygen vacancies into hematite in local reducing atmosphere for solar water oxidation

Solar Energy ◽  
2019 ◽  
Vol 179 ◽  
pp. 99-105
Author(s):  
Yi Zhou ◽  
Mingkun Yan ◽  
Junxian Hou ◽  
Yakun Niu ◽  
Dawei Ni ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Solar Water ◽  
Reducing Atmosphere ◽  
Solar Water Oxidation

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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