铁的替代使得格子氧氧化和阴离子漏能够促进电催化氧进化过程中的表面重建
Weiwei Yang1, Yu Bai1, Lin Peng2
1Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, PR China; Beijing Key Laboratory of Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
Journal of colloid and interface science
|November 19, 2023
概括
在螺旋氧化物NiCr2O4中的铁替代促进了表面重建,为增强氧演化反应 (OER) 电催化产生了活性 (氧) ,提高了效率和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 低成本的过渡金属氧化物是氧化物演化反应 (OER) 贵金属电催化剂的有希望的替代品.
- 表面重建对于激活这些氧化物至关重要,但难以控制.
- 了解和规范这一过程是提高开放资源表现的关键.
研究的目的:
- 为了研究Fe替代对OER的NiCr2O4表面重建的影响.
- 开发一种简单的策略来增强螺旋氧化物的电催化活性和稳定性.
主要方法:
- 在NiCr2O4螺旋氧化物中替代Fe元素.
- 电化学激活和表征 (包括循环电压测量).
- 纳米结构分析和理论计算 (DFT).
主要成果:
- 与非化NiCr2O4 (Act-Fe-NCO) 相比,化NiCr2O4 (Act-Fe-NCO) 在10 mA cm-2.2时显示出明显较低的OER超电位 (259 mV) 与未化NiCr2O4 (Act-NCO,428 mV) 相比.
- 在120小时内,Act-Fe-NCO表现出极好的稳定性.
- 铁的替代促进了晶格氧气消耗和Cr的浸出,促进了活性 (氧) 氧化物种的形成.
结论:
- 铁的替代有效调节了OER的NiCr2O4表面重建动力学.
- 这一策略通过促进活性 (氧) 氧化物相的形成来增强OER活动和稳定性.
- 这些发现为设计高性能过渡金属氧化物电催化剂提供了有希望的途径.
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