Hf 和 Co 双单原子共碳催化剂 提高氧降低性能
Diancheng Duan1, Junlang Huo1, Jiaxiang Chen1
1The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 8, 2024
概括
这项研究引入了一种双单原子化催化剂 (HfCo-N-C),用于增强氧降解反应 (ORR). 与传统的单原子催化剂相比,HfCo-N-C催化剂显示出更高的活性和耐用性.
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
- 催化剂是一种催化剂.
背景情况:
- 单原子金属合M-N-C催化剂 (M=Fe,Co,Mn,Ni) 在氧降解反应 (ORR) 中表现有前途.
- 目前的M-N-C催化剂在实际应用中存在性能差距.
研究的目的:
- 开发一种高性能双单原子合碳催化剂,以提高ORR活性和耐用性.
- 在-碳框架中研究共Hf和Co原子的协同效应.
主要方法:
- (Co) 和海 (Hf) 的热解联合化化伊米达酸框架-8 (ZIF-8) 制造HfCo-N-C催化剂.
- 原子分散的Co和Hf与 (N) 形成Co-N4和Hf-N4活性位点.
- 在酸性介质中进行电化学测试,以评估ORR性能和耐用性.
主要成果:
- 在酸性介质中,HfCo-N-C催化剂实现了0.82V的ORR半波电位 (E1/2),超过了Co-N-C (0.80V).
- 在0.85V时达到2.49A cm-2的动力电流密度,比Co-N-C高1.74倍.
- 在质子交换膜燃料电池和Zn-空气电池中表现出卓越的正极性能.
- Hf联合兴奋剂显著抑制了H2O2的形成,增强了催化剂的稳定性和耐用性.
结论:
- 在-碳框架中使用Hf和Co的双单原子兴奋剂,为高级ORR催化产生协同效应.
- HfCo-N-C催化剂为能源转换应用提供了增强的活性,耐用性和稳定性.
- 这项工作为设计用于电化学能源设备的先进单原子催化剂提供了新的途径.
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