Modifying the Electron-Trapping Process at the BiVO4 Surface States via the TiO2 Overlayer for Enhanced Water Oxidation

2021 ◽  
Author(s):  
Emre Usman ◽  
Mahsa Barzgar Vishlaghi ◽  
Abdullah Kahraman ◽  
Navid Solati ◽  
Sarp Kaya
Keyword(s):  
Water Oxidation ◽  
Surface States ◽  
Electron Trapping ◽  
Trapping Process

Surface states in BiVO4 photoanodes for water oxidation: tuning the electron trapping process

2018 ◽  
Author(s):  
Teresa Andreu ◽  
Sebastian Murcia-López ◽  
Qin Shi
Keyword(s):  
Water Oxidation ◽  
Surface States ◽  
Electron Trapping ◽  
Trapping Process

Surface states in BiVO4 photoanodes for water oxidation: tuning the electron trapping process

2018 ◽  
Author(s):  
Teresa Andreu ◽  
Sebastian Murcia-López ◽  
Qin Shi
Keyword(s):  
Water Oxidation ◽  
Surface States ◽  
Electron Trapping ◽  
Trapping Process

scholarly journals Role of Tungsten Doping on the Surface States in BiVO4 Photoanodes for Water Oxidation: Tuning the Electron Trapping Process

ACS Catalysis ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 3331-3342 ◽  
Author(s):  
Qin Shi ◽  
Sebastián Murcia-López ◽  
Pengyi Tang ◽  
Cristina Flox ◽  
Joan R. Morante ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Surface States ◽  
Electron Trapping ◽  
Trapping Process ◽  
Tungsten Doping

Acid-treated Ti4+ doped hematite photoanode for efficient solar water oxidation—Insight into surface states and charge separation

2019 ◽  
Vol 782 ◽  
pp. 943-951 ◽  
Author(s):  
Qiannan Wu ◽  
Dedong Meng ◽  
Yu Zhang ◽  
Qidong Zhao ◽  
QiJing Bu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Charge Separation ◽  
Surface States ◽  
Solar Water ◽  
Solar Water Oxidation ◽  
Insight Into

Ultrathin CoOx nanolayers derived from polyoxometalate for enhanced photoelectrochemical performance of hematite photoanodes

2019 ◽  
Vol 7 (11) ◽  
pp. 6294-6303 ◽  
Author(s):  
Xiaohu Cao ◽  
Yifan Wang ◽  
Junqi Lin ◽  
Yong Ding
Keyword(s):  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface States ◽  
Photoelectrochemical Performance

A CoOx nanolayer derived from Co8POM by photodeposition effectively passivates the surface states of hematite, thereby improving the water oxidation kinetics.

Passivation of surface states by ALD-grown TiO2 overlayers on Ta3N5 anodes for photoelectrochemical water oxidation

2016 ◽  
Vol 52 (57) ◽  
pp. 8806-8809 ◽  
Author(s):  
Peng Zhang ◽  
Tuo Wang ◽  
Jinlong Gong
Keyword(s):  
Thin Film ◽  
Atomic Layer Deposition ◽  
Water Oxidation ◽  
Surface States ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Photoelectrochemical Water Oxidation

This paper describes the fabrication of TiO2 overlayers by atomic layer deposition to passivate the surface states on Ta3N5 thin film anodes for photoelectrochemical water oxidation.

scholarly journals Identifying the Spectroelectrochemical Characteristics of Hematite Photoanodes for Water Oxidation

2021 ◽  
Author(s):  
Jifang Zhang ◽  
Qiyuan Lin ◽  
Zhenlei Wang ◽  
Haowen Liu ◽  
Yuegang Zhang
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Surface States ◽  
Reaction Pathways ◽  
Reaction Intermediates ◽  
Fermi Level Pinning ◽  
Solar Water Splitting ◽  
Interfacial Processes ◽  
Active Reaction ◽  
Recombination Processes

Achieving efficient solar water splitting using hematite (α-Fe2O3), one of the most promising candidates for photoanodes, requires photogenerated holes to be efficiently used for water oxidation. However, this goal is obstructed by multiple undesirable recombination processes, as well as insufficient fundamental mechanistic understandings of water oxidation kinetics, particularly as to the nature of reaction pathways and possible reaction intermediates. Here we spectroelectro-chemically identify some of the most critical interfacial processes which determine the photoelectrocatalytic efficiencies of water oxidation, for hematite films with varied surface properties by tailoring the doping level of titanium. The spectroscopic signals of the processes inactive for water oxidation, including oxidation of intra-gap Fe2+ states and Fermi level pinning, are successfully distinguished from that of the active reaction intermediate, Fe(IV)=O. In addition, our kinetic analyses reveal two water oxidation pathways, of which the direct hole transfer mechanism becomes dominant over the surface states-mediated mechanism when the hematite surface is reconstructed by high levels of titanium dopants.

scholarly journals Identifying the Spectroelectrochemical Characteristics of Hematite Photoanodes for Water Oxidation

2021 ◽  
Author(s):  
Jifang Zhang ◽  
Qiyuan Lin ◽  
Zhenlei Wang ◽  
Haowen Liu ◽  
Yuegang Zhang
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Surface States ◽  
Reaction Pathways ◽  
Reaction Intermediates ◽  
Fermi Level Pinning ◽  
Solar Water Splitting ◽  
Interfacial Processes ◽  
Active Reaction ◽  
Recombination Processes

Achieving efficient solar water splitting using hematite (α-Fe2O3), one of the most promising candidates for photoanodes, requires photogenerated holes to be efficiently used for water oxidation. However, this goal is obstructed by multiple undesirable recombination processes, as well as insufficient fundamental mechanistic understandings of water oxidation kinetics, particularly as to the nature of reaction pathways and possible reaction intermediates. Here we spectroelectro-chemically identify some of the most critical interfacial processes which determine the photoelectrocatalytic efficiencies of water oxidation, for hematite films with varied surface properties by tailoring the doping level of titanium. The spectroscopic signals of the processes inactive for water oxidation, including oxidation of intra-gap Fe2+ states and Fermi level pinning, are successfully distinguished from that of the active reaction intermediate, Fe(IV)=O. In addition, our kinetic analyses reveal two water oxidation pathways, of which the direct hole transfer mechanism becomes dominant over the surface states-mediated mechanism when the hematite surface is reconstructed by high levels of titanium dopants.

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