在NiFe LDH上引发电子注入-不完全放电的电子积累,用于增强氧气演化反应
Rongrong Zhang1, Yun Han2, Qilong Wu3
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|April 18, 2024
概括
在铁层双氧化物中的电子积累增强了氧气演化反应活性. 这种电子效应降低了过量的电位,并改善了用于能源应用的电催化剂设计.
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:
- 优化电催化剂电子结构是降低反应能量障碍和增强活性的关键.
- 电子效应对电催化物的确切实验贡献尚不清楚.
研究的目的:
- 揭示电子积累 (EA) 对氧化演化反应 (OER) 性能的内在贡献.
- 用电子注入不完全放电方法研究铁层双氧化物 (NiFe LDH) 中的电子积累.
主要方法:
- 开发了一种电子注入不完全放电方法,以诱导在NiFe LDH中的电子积累 (EA).
- 通过测量超电位和Tafel斜率来评估OER性能.
- 利用光谱学表征和理论计算来证实该机制.
主要成果:
- 带有EA的NiFe LDH在50 mA cm-2.2时表现出明显较低的超电位 (262 mV vs. 313 mV).
- 塔菲尔斜率从原始NiFe LDH的107.5mV dec-1降低到EA的54.8mV dec-1.
- 谱学和计算证实,在空缺附近的EA缩小了能源差距并降低了热力学障碍.
结论:
- 电子积累是提高NiFe LDH中的OER活性的一个关键因素.
- 该研究提供了直接电子结构调制指南,用于设计有效的电催化剂.
- 这项工作澄清了EA对OER绩效影响的机制.
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