Impact of oxygen vacancies on TiO2 charge carrier transfer for photoelectrochemical water splitting

2020 ◽  
Vol 49 (7) ◽  
pp. 2184-2189 ◽  
Author(s):  
Xiaoqian Huang ◽  
Xiaoru Gao ◽  
Qihui Xue ◽  
Can Wang ◽  
Ruikang Zhang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Oxygen Vacancies ◽  
Photoelectrochemical Water Splitting ◽  
Carrier Transfer ◽  
The Impact

The impact of oxygen vacancies on charge carrier transfer on TiO2 photoanodes is rationally discussed in this work.

Defective Fe3+ self-doped spinel ZnFe2O4 with oxygen vacancies for highly efficient photoelectrochemical water splitting

2019 ◽  
Vol 48 (31) ◽  
pp. 11934-11940 ◽  
Author(s):  
Jianmin Wang ◽  
Yunan Wang ◽  
Xinchao Xv ◽  
Yan Chen ◽  
Xi Yang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Performance ◽  
Highly Efficient

Defective Fe3+ self-doped spinel ZnFe2O4 with abundant oxygen vacancies exhibits largely enhanced photoelectrochemical performance.

Time-Resolved Observations of Photo-Generated Charge-Carrier Dynamics in Sb2Se3 Photocathodes for Photoelectrochemical Water Splitting

ACS Nano ◽  
2018 ◽  
Vol 12 (11) ◽  
pp. 11088-11097 ◽  
Author(s):  
Wooseok Yang ◽  
Seungmin Lee ◽  
Hyeok-Chan Kwon ◽  
Jeiwan Tan ◽  
Hyungsoo Lee ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Carrier Dynamics ◽  
Photoelectrochemical Water Splitting ◽  
Time Resolved ◽  
Charge Carrier Dynamics

Improved charge carrier dynamics of WS2 nanostructures by the way of CdS@WS2 heterostructures for use in water splitting and water purification

2020 ◽  
Vol 4 (8) ◽  
pp. 4096-4107
Author(s):  
Muthuraja Velpandian ◽  
Supriya Pulipaka ◽  
Akshay Tikoo ◽  
Praveen Meduri
Keyword(s):  
Charge Carrier ◽  
Cadmium Sulfide ◽  
Water Splitting ◽  
Water Purification ◽  
Fluorescence Emission ◽  
Life Time ◽  
Carrier Dynamics ◽  
Photoelectrochemical Water Splitting ◽  
Charge Carrier Dynamics ◽  
Emission Decay

Long emission decay life time and significantly quenched fluorescence emission of tungsten disulfide (WS2)/cadmium sulfide (CdS) heterostructures aid in enhancing photoelectrochemical water splitting and water purification properties.

scholarly journals Activating the surface and bulk of hematite photoanodes to improve solar water splitting

2019 ◽  
Vol 10 (44) ◽  
pp. 10436-10444 ◽  
Author(s):  
Hemin Zhang ◽  
Jong Hyun Park ◽  
Woo Jin Byun ◽  
Myoung Hoon Song ◽  
Jae Sung Lee
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Surface Passivation ◽  
Photoelectrochemical Water Splitting ◽  
Electrochemical Activation ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Waking Up

Waking up the hematite lion: a simple electrochemical activation treatment leads to surface passivation outside and generation of oxygen vacancies inside, which greatly enhances photoelectrochemical water splitting.

Interface Engineering for Modulation of Charge Carrier Behavior in ZnO Photoelectrochemical Water Splitting

2019 ◽  
Vol 29 (15) ◽  
pp. 1808032 ◽  
Author(s):  
Zhuo Kang ◽  
Haonan Si ◽  
Suicai Zhang ◽  
Jing Wu ◽  
Yu Sun ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Interface Engineering

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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