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Symmetrical-waveform alternating current-promoted NiOH electrocatalysis for the oxygen evolution reaction
Zhihao Qi1, Jinwei Zhuang1, Wantong Yang1
1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China. jinhu1_hao@ujs.edu.cn.
Chemical Communications (Cambridge, England)
|August 15, 2023
Summary
A new alternating current method creates gradient oxygen vacancies (VO) in situ. This innovation enhances reaction kinetics, leading to an 84.7% increase in current density for improved performance.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Science
Background:
- Oxygen vacancies (VO) play a crucial role in the electrochemical performance of materials.
- Controlling the distribution of VO is challenging, limiting performance optimization.
- Existing methods for VO creation often lack in situ control and precise gradient formation.
Purpose of the Study:
- To develop a novel in situ method for creating gradient oxygen vacancies (VO) in materials.
- To investigate the impact of engineered VO gradients on electrochemical reaction kinetics.
- To enhance the current density and overall performance of electrochemical devices.
Main Methods:
- Implementation of a symmetrical waveform alternating current (AC) strategy.
- In situ generation and characterization of gradient VO distribution.
- Electrochemical measurements to quantify current density and reaction kinetics.
Main Results:
- Successful in situ fabrication of materials with a controlled gradient of oxygen vacancies (VO).
- Demonstrated that the unique VO gradient acts as multiple reaction steps, reducing kinetic barriers.
- Achieved a significant total increase of up to 84.7% in current density.
Conclusions:
- The symmetrical waveform AC strategy is an effective approach for in situ VO gradient engineering.
- Engineered VO gradients significantly improve electrochemical reaction kinetics and performance.
- This method offers a pathway for developing advanced materials with enhanced electrochemical properties.
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