scholarly journals Surface Modification of Hematite Photoanodes with CeO x Cocatalyst for Improved Photoelectrochemical Water Oxidation Kinetics

ChemSusChem ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5489-5496
Author(s):  
Mahmoud G. Ahmed ◽  
Mengyuan Zhang ◽  
Ying Fan Tay ◽  
Sing Yang Chiam ◽  
Lydia H. Wong
Keyword(s):  
Surface Modification ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Photoelectrochemical Water Oxidation

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...

Improvement of the water oxidation performance of Ti, F co-modified hematite by surface modification with a Co(salen) molecular cocatalyst

2020 ◽  
Vol 8 (41) ◽  
pp. 21613-21622
Author(s):  
Ruiling Wang ◽  
Yasutaka Kuwahara ◽  
Kohsuke Mori ◽  
Catherine Louis ◽  
Yuyu Bu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Water Oxidation ◽  
Oxidation Performance ◽  
Ti Doping ◽  
Photoelectrochemical Water Oxidation ◽  
New System

A new system by combining Ti-doping and F-treatment in hematite modified with Co(salen) as a cocatalyst exhibits enhanced photoelectrochemical water oxidation performance.

Enhanced water oxidation reaction kinetics on a BiVO4 photoanode by surface modification with Ni4O4 cubane

2019 ◽  
Vol 7 (1) ◽  
pp. 278-288 ◽  
Author(s):  
Bin Gao ◽  
Tao Wang ◽  
Xiaoli Fan ◽  
Hao Gong ◽  
Peng Li ◽  
...  
Keyword(s):  
Surface Modification ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Reaction ◽  
Adsorbed Layer ◽  
Highly Efficient ◽  
Photoelectrochemical Water Oxidation

Ni4O4 cubane is combined with a BiVO4 photoanode via an Al2O3 adsorbed layer for highly efficient and stable photoelectrochemical water oxidation.

Ultrathin Ti3C2 nanosheets served as a high-efficient hole transport layer on Fe2O3 photoanode for photoelectrochemical water oxidation

2021 ◽  
Author(s):  
Chenchen Feng ◽  
Han Fu ◽  
Henan Jia ◽  
Haize Jin ◽  
xiang cheng ◽  
...  
Keyword(s):  
Surface Modification ◽  
Catalytic Reaction ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Oxidation Activity ◽  
High Efficient ◽  
Photoelectrochemical Water Oxidation

Surface modification of oxygen evolution reaction (OER) cocatalysts is a promising approach to improve PEC water oxidation activity by accelerating the surface charge injection efficiency and catalytic reaction kinetics. However,...

scholarly journals Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 497 ◽  
Author(s):  
Lifei Xi ◽  
Kathrin Lange
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface Passivation ◽  
Earth Metal ◽  
Photoelectrochemical Performance ◽  
Onset Potential ◽  
Solar Water Splitting

Solar water splitting is a promising method for producing renewable fuels. Thermodynamically, the overall water splitting reaction is an uphill reaction involving a multiple electron transfer process. The oxygen evolution reaction (OER) has been identified as the bottleneck process. Hematite (α-Fe2O3) is one of the best photoanode material candidates due to its band gap properties and stability in aqueous solution. However, the reported efficiencies of hematite are notoriously lower than the theoretically predicted value mainly due to poor charge transfer and separation ability, short hole diffusion length as well as slow water oxidation kinetics. In this Review Article, several emerging surface modification strategies to reduce the oxygen evolution overpotential and thus to enhance the water oxidation reaction kinetics will be presented. These strategies include co-catalysts loading, photoabsorption enhancing (surface plasmonic metal and rare earth metal decoration), surface passivation layer deposition, surface chemical etching and surface doping. These methods are found to reduce charge recombination happening at surface trapping states, promote charge separation and diffusion, and accelerate water oxidation kinetics. The detailed surface modification methods, surface layer materials, the photoelectrochemical (PEC) performances including photocurrent and onset potential shift as well as the related proposed mechanisms will be reviewed.

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.

Improved photoelectrochemical water oxidation kinetics using a TiO2 nanorod array photoanode decorated with graphene oxide in a neutral pH solution

2015 ◽  
Vol 17 (12) ◽  
pp. 7714-7719 ◽  
Author(s):  
Sang Youn Chae ◽  
Pitchaimuthu Sudhagar ◽  
Akira Fujishima ◽  
Yun Jeong Hwang ◽  
Oh-Shim Joo
Keyword(s):  
Graphene Oxide ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxide Coating ◽  
Nanorod Array ◽  
Tio2 Nanorod ◽  
Neutral Ph ◽  
Tio2 Nanorod Array ◽  
Photoelectrochemical Water Oxidation

Opposite contributions of graphene oxide are obtained in TiO2 nanorod array photoanodes, in electrolytes of varying pH, for the water splitting application. The photocurrent of TiO2 photoanode is improved, after graphene oxide coating, in a neutral pH electrolyte, while it decreases in a basic electrolyte.

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