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抗位缺陷释放了高性金属间的催化潜力,用于氧降解反应

Tao Chen^1,2, Xinkai Zhang³, Hangchao Wang¹

¹Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, School of Materials Science and Engineering, Peking University, Beijing, China.

Nature communications

|April 8, 2025

概括

一种基于的新型高金属间电催化剂具有工程缺陷,可显著增强质子交换膜燃料电池 (PEMFC) 的氧降解反应 (ORR). 这一突破为商业催化剂提供了低成本,持久的替代品,提高了燃料电池的性能.

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:

质子交换膜燃料电池 (PEMFC) 需要高效,具有成本效益和耐用的催化剂来进行氧降解反应 (ORR).
目前的商业催化剂,主要是以为基础的,面临成本和耐用性方面的挑战,阻碍了PEMFC的广泛采用.

研究的目的:

开发一种具有增强活性和耐久性的新型电催化剂,用于PEMFC中的ORR.
调查缺陷工程在用于催化应用的高金属间化合物中的作用.

主要方法:

一个有序的PtZnFeCoNiCr高金属间电催化剂与Pt抗位点缺陷 (PD-PZFCNC-HEI) 的合成.
在PEMFC中电化学表征催化剂的ORR活性和性能.
在现场X射线吸收细结构 (XAFS) 和理论计算以阐明催化机制.

主要成果:

合成的PD-PZFCNC-HEI催化剂对ORR的质量活性为4.12 A mg_Pt^-1,是商业Pt/C的33倍.
使用这种催化剂的PEMFC实现了1.9 W cm-2的峰值功率密度和0.9 V的3.0 A mg Pt-1的质量活性.
缺陷工程被证明可以优化Pt的电子结构,并激活非贵金属位点,从而导致优异的ORR催化.

结论:

开发的有序高金属间电催化剂具有工程缺陷,为PEMFC中的ORR提供了高度活跃和潜在的成本效益的替代方案.
这项研究证明了缺陷工程在设计用于清洁能源应用的先进电催化剂方面的有效性.
这些发现为未来开发纳米结构高性金属间催化剂提供了宝贵的见解.

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