WO3 photoanodes with controllable bulk and surface oxygen vacancies for photoelectrochemical water oxidation

2018 ◽  
Vol 6 (8) ◽  
pp. 3350-3354 ◽  
Author(s):  
Jijie Zhang ◽  
Xiaoxia Chang ◽  
Chengcheng Li ◽  
Ang Li ◽  
Shanshan Liu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Ozone Treatment ◽  
Surface Oxygen ◽  
Photoelectrochemical Performance ◽  
Hydrogen Annealing ◽  
Bulk Oxygen ◽  
Photoelectrochemical Water Oxidation ◽  
Reduced Surface

WO3 nanoflake photoanodes with suitable bulk oxygen vacancies and reduced surface oxygen vacancies are synthesized by hydrogen annealing and ozone treatment, which exhibit excellent photoelectrochemical performance.

Reducing the surface defects of Ta3N5 photoanode towards enhanced photoelectrochemical water oxidation

2020 ◽  
Vol 8 (44) ◽  
pp. 23274-23283
Author(s):  
Chenyi Shao ◽  
Ruotian Chen ◽  
Yongle Zhao ◽  
Zheng Li ◽  
Xu Zong ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Surface Defects ◽  
Photoelectrochemical Performance ◽  
Flame Heating ◽  
Photoelectrochemical Water Oxidation ◽  
Reduced Surface

Ta3N5 photoanodes with reduced surface defects were obtained through the nitridation of a two-step-flame-heating-derived Ta2O5 precursor and exhibited enhanced photoelectrochemical performance.

Bifunctional citrate-Ni0.9Co0.1(OH)x layer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation

Nanoscale ◽  
2021 ◽  
Author(s):  
Peng Wang ◽  
Feng Li ◽  
Xuefeng Long ◽  
Tong Wang ◽  
Huan Chai ◽  
...  
Keyword(s):  
Surface Modification ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Surface Oxygen ◽  
Co Catalyst ◽  
Photoelectrochemical Water Oxidation

Surface modification by loading a water oxidation co-catalyst (WOC) is generally considered to be an efficient means to optimize the sluggish surface oxygen evolution reaction (OER) of hematite photoanode for...

Enhanced photoelectrochemical performance of internally porous Au-embedded α-Fe2O3 photoanodes for water oxidation

2017 ◽  
Vol 53 (30) ◽  
pp. 4278-4281 ◽  
Author(s):  
Pravin S. Shinde ◽  
Su Yong Lee ◽  
Jungho Ryu ◽  
Sun Hee Choi ◽  
Jum Suk Jang
Keyword(s):  
Water Oxidation ◽  
Photoelectrochemical Performance ◽  
Oxidation Performance ◽  
Photoelectrochemical Water Oxidation

We report CTAB-mediated synthesis of internally porous Au-embedded hematite photoanode with enhanced photoelectrochemical water oxidation performance.

scholarly journals The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation

2015 ◽  
Vol 174-175 ◽  
pp. 403-412 ◽  
Author(s):  
Jose Manuel López ◽  
Alexander L. Gilbank ◽  
Tomás García ◽  
Benjamín Solsona ◽  
Said Agouram ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Surface Oxygen ◽  
Toluene Oxidation ◽  
Nanostructured Ceria ◽  
Bulk Oxygen

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.

Enhanced photoelectrochemical performance of plate-like WO 3 induced by surface oxygen vacancies

2016 ◽  
Vol 68 ◽  
pp. 81-85 ◽  
Author(s):  
Yang Liu ◽  
Jie Li ◽  
Hui Tang ◽  
Wenzhang Li ◽  
Yahui Yang ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Surface Oxygen ◽  
Photoelectrochemical Performance
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