一种高级的双功能电催化剂,在该电催化剂中,Co/Ni合金和Fe─N─C支之间发生了定向电子转移
Ziyi Xu1,2, Shihao Wang1,2, Wenmao Tu1,3
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, No. 122 Luoshi Road, Wuhan, 430070, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 22, 2024
概括
一种具有定向电子转移的新型CoNi@Fe-N-C催化剂可增强可充电空气电池的双功能氧气电催化,显示出增强的活性和耐用性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 可充电的空气电池需要稳定,高效和经济的双功能电催化剂,用于氧化演化反应 (OER) 和氧减少反应 (ORR).
- 现有的催化剂在实际应用中经常面临活动,稳定性或成本效益的限制.
研究的目的:
- 开发一种具有空间异质连接的新型异质催化剂,用于增强双功能OER/ORR电催化.
- 为了研究催化剂结构内定向电子转移的机制.
- 为了评估可充电空气电池中催化剂的性能.
主要方法:
- 一个CoyNix@Fe─N─C异质催化剂的合成.
- 使用实验技术和密度函数理论 (DFT) 计算进行表征.
- 对OER和ORR活动和耐久性的电化学测试.
- 可充电空气电池 (ZAB) 的组装和测试.
主要成果:
- Co0.66Ni0.34@Fe─N─C催化剂展示了一个空间异质连接,通过Co/Ni─N键,Co/Ni─C合金和Fe─N─C支之间具有强烈的合.
- DFT的计算和实验证实了从Co/Ni到Fe─N─C的定向电子转移,增强了pyridinic含量和催化活性.
- 催化剂实现了0.90V的ORR半波潜力和317mV的OER超电位在10mA cm-2时.
- 组装的ZAB显示了小的充电-放电电压差距和超过60小时的强大性能.
结论:
- 开发的CoNi@Fe-N-C催化剂有效地利用定向电子转移,实现卓越的双功能OER/ORR性能.
- 催化剂为可充电空气电池的贵金属基催化剂提供了一个有希望的替代品.
- 这项工作提供了通过协同效应和控制的电子转移通路设计先进的电催化剂的见解.
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