轴性氧联体调节 Zn-N-C 位点的电子和几何结构,以促进氧降解反应
Qiuyan Jin1,2, Chenhui Wang1,2, Yingying Guo1,2
1School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 26, 2023
概括
具有轴氧协调 (Zn-N4-O) 的工程--碳催化剂显著提高了先进的-空气电池的氧降解反应 (ORR) 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
- 催化剂是一种催化剂.
背景情况:
- --碳 (Zn-N-C) 材料在芬顿式反应方面表现有前途,但氧降解反应 (ORR) 活性较差.
- 单原子 (Zn) 中心的电子和几何结构由于Zn的电子配置和挥发性而难以控制.
- 现有的Zn-N-C催化剂在ORR应用中通常表现出有限的效率.
研究的目的:
- 设计和合成一种具有增强ORR性能的新型单原子催化剂.
- 研究轴协调对Zn-N-C材料催化性能的影响.
- 为了提高基于Zn的电催化剂的耐用性和甲醇耐受性.
主要方法:
- 理论计算指导了五倍协调的单原子Zn位点 (Zn-N4-O) 的构建.
- 用离子液体辅助盐模板方法用于催化剂合成.
- 使用旋转盘电极电压测量和Zn-空气电池测试来评估电化学性能.
主要成果:
- 构建的Zn-N4-O位点表现出非平面结构,促进电子转移和削弱OH吸附.
- 催化剂显著改善了ORR活性和优异的甲醇耐受性.
- 使用Zn-N4-O的Zn-空气电池达到182mW cm−2的最大功率密度,并运行超过160小时.
结论:
- 轴氧协调是增强ORR活性和基于Zn的单原子催化剂稳定的有效策略.
- 开发的Zn-N4-O催化剂为高效和持久的储能应用提供了一个有前途的替代方案.
- 这项工作通过对单原子催化剂的协调工程提供了对催化剂设计的新见解.
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