Mn-N-C具有高密度原子分散的Mn活性站点,用于氧降解反应
Gongjin Chen1,2,3,4, Xiaoyi Qiu1,3,4, Shiyuan Liu1,3,4
1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, 999077, China.
Angewandte Chemie (International ed. in English)
|April 18, 2025
概括
开发先进的基-碳 (Mn-N-C) 催化剂显著提高了燃料电池的氧降解反应 (ORR) 活性和耐用性. 这一突破为催化剂提供了一个有希望的,具有成本效益的替代品.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧降解反应 (ORR) 对燃料电池至关重要,但受到缓慢的动力学和依赖昂贵的催化剂的阻碍.
- 基于的碳 (Mn-N-C) 材料具有作为耐用,非贵金属ORR电催化剂的潜力.
- 提高Mn-N-C催化剂的内在活性和活性位密度对于实际的燃料电池应用至关重要.
研究的目的:
- 为具有高活性位密度的原子分散的Mn-N-C催化剂开发一种高效的合成方法.
- 为了提高Mn-N-C材料的电催化活性和耐久性,用于氧降解反应 (ORR).
- 为了证明Mn-N-C催化剂在质子交换膜燃料电池 (PEMFC) 和离子交换膜燃料电池 (AEMFC) 中的可行性.
主要方法:
- 为了制造Mn-N-C材料,采用了三步合成方法.
- 合成的重点在于在-碳矩阵和丰富的中孔结构中实现原子分散的.
- 实现了高负载,以促进特定活性位点的形成.
主要成果:
- 合成的Mn-N-C催化剂呈现出高负载 (3.42重量%) 和高密度的双MnN4活性位点.
- 实现了特殊的燃料电池性能:649mW cm-2在PEMFC中和770mW cm-2在AEMFC中.
- 在PEMFC中证明了前所未有的耐用性,在30,000个方波周期后,性能衰退仅为18.4%.
结论:
- 开发的Mn-N-C催化剂显示出显著的电催化活性和ORR的耐用性,超过现有的非贵金属催化剂.
- 这项工作为设计各种电催化应用的高性能非贵金属催化剂提供了可行的策略.
- 这些发现为具有成本效益和高效的燃料电池技术铺平了道路.
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