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A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
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Fe-modified Co2(OH)3Cl microspheres for highly efficient oxygen evolution reaction.
Wei Wang1, Yunlei Zhong2, Xinyu Zhang1
1Key Laboratory of Mesoscopic Chemistry of MOE, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Journal of Colloid and Interface Science
|September 11, 2020
Summary
Electrochemical activation enhances cobalt oxyhydroxide microspheres for the oxygen evolution reaction (OER). Iron doping further boosts performance and stability, outperforming commercial ruthenium dioxide.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrochemical activation is key for improving transition metal compound performance in oxygen evolution reactions (OER).
- Surface self-reconstruction via electrochemical methods offers a pathway to enhance catalytic activity.
Purpose of the Study:
- To develop and investigate the OER performance of uniform Co2(OH)3Cl microspheres.
- To explore the impact of Fe modification on the OER activity and stability of Co2(OH)3Cl.
- To understand the mechanism behind Fe doping-induced enhancement.
Main Methods:
- Synthesis of uniform Co2(OH)3Cl microspheres.
- Electrochemical activation using cyclic voltammetry (CV) cycles.
- Fe doping into Co2(OH)3Cl lattices using Fe2+ precursor.
- Electrochemical characterization to evaluate OER performance and stability.
Main Results:
- Co2(OH)3Cl microspheres showed enhanced OER performance after 500 CV cycles due to Cl- etching.
- Fe doping further improved OER activity, with 10% Fe-Co2(OH)3Cl exhibiting a lower overpotential (273 mV at 10 mA cm-2) after activation.
- Fe doping facilitated Cl- etching, increased surface vacancies, and optimized oxygen adsorption affinity.
- The 10% Fe-Co2(OH)3Cl demonstrated superior stability compared to commercial RuO2.
Conclusions:
- Surface self-reconstruction and Fe doping are effective strategies to enhance OER performance of Co2(OH)3Cl.
- Fe modification optimizes surface properties, leading to improved catalytic activity and stability.
- The developed Fe-doped Co2(OH)3Cl presents a promising alternative to commercial catalysts for OER.
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