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.

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.

A highly enhanced photoelectrochemical performance of BiVO4 photoanodes modified with CoPi groups by increasing energy band bending, accelerating hole separation and improving water oxidation kinetics

2022 ◽  
Author(s):  
Wanqing Fang ◽  
Ai Qin ◽  
Yimin Lin ◽  
Rongzi Xv ◽  
Li Fu
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Energy Band ◽  
Chemical Characterization ◽  
Photoelectrochemical Performance ◽  
Band Bending ◽  
Physical And Chemical Characterization ◽  
Energy Band Bending ◽  
Physical And Chemical

BiVO4 is one of the most attractive photoanode materials for photoelectrochemical water splitting. Herein, cobalt phosphate (CoPi) modified BiVO4 (BiVO4/CoPi) photoanode is prepared by electrodeposition. The physical and chemical characterization...

Boosting the efficiency of water oxidation via surface states on hematite photoanodes by incorporating Bi3+ ions

2020 ◽  
Vol 4 (8) ◽  
pp. 4207-4218
Author(s):  
Abdul Zeeshan Khan ◽  
Tarek A. Kandiel ◽  
Safwat Abdel-Azeim ◽  
Khalid Alhooshani
Keyword(s):  
Crystal Structure ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxygen Vacancies ◽  
Surface States ◽  
The Creation ◽  
Photoelectrochemical Water Oxidation

The incorporation of Bi3+ ions into the hematite crystal structure induces the creation of oxygen vacancies and boosts the photoelectrochemical water oxidation kinetics.

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

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.

Two photon tandem photoanode with black phosphorous quantum dot sensitized BiVO4 for solar water splitting

2022 ◽  
Author(s):  
Bingjun Jin ◽  
Yoonjun Cho ◽  
Cheolwoo Park ◽  
Jeehun Jeong ◽  
Sungsoon Kim ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Light Harvesting ◽  
Charge Recombination ◽  
Solar Water ◽  
Two Photon ◽  
Solar Water Splitting ◽  
Pec Water Splitting

The photoelectrochemical (PEC) water splitting efficiency is profoundly restricted by the limited light harvesting, rapid charge recombination, and sluggish water oxidation kinetics, in which the construction of a photoelectrode requires...

Light induced formation of a surface heterojunction in photocharged CuWO4 photoanodes

2019 ◽  
Vol 215 ◽  
pp. 175-191 ◽  
Author(s):  
Anirudh Venugopal ◽  
Wilson A. Smith
Keyword(s):  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Charge Separation ◽  
Electrolyte Interface

Photocharging of CuWO4 photoanodes enhances its water oxidation kinetics as a result of improved charge separation near the electrode/electrolyte interface post photocharging.

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