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通过原子铁站诱导的格子扩张提高基于的多孔催化剂的氧气电还原效率

Man Wang¹, Jianming Liu¹, Xiangju Zhou²

¹National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology, and College of Engineering and Appied Science, Nanjing University, Nanjing, 210093, P.R. China.

Angewandte Chemie (International ed. in English)

|October 21, 2025

概括

一种具有单个铁位点的新型碳封装多孔催化剂有效催化了质子交换膜燃料电池 (PEMFC) 的氧降解反应 (ORR),显示出高活性和稳定性.

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:

开发用于氧降解反应 (ORR) 的非贵金属催化剂对于推进质子交换膜燃料电池 (PEMFC) 至关重要.
关键的挑战包括抑制金属液和优化氧中间体吸附/解离在酸性介质中ORR期间.

研究的目的:

为ORR设计和合成一种新的,稳定的,高度活跃的非贵金属电催化剂.
研究影响PEMFC中催化剂性能的结构和电子特性.

主要方法:

一个单步的热还原过程,使用纳米颗粒作为前体,以创建碳封装的多孔与单个铁位点.
电化学表征包括循环电压测量和燃料电池测试.
光谱分析 (例如,X射线光电子光谱) 和理论计算 (例如,密度函数理论).

主要成果:

合成的催化剂显示出高ORR活性,半波潜力为0.88V (酸性) 和0.95V (性).
经过4万个循环后,观察到异常稳定性,潜在衰变最小 (7mV酸性,4mV性).
催化剂在PEMFC中达到0.63W cm−2的峰值功率密度,并在恒定电位下保持100小时的耐用性.

结论:

在碳外内集成到多孔中的单个铁位形成稳定的Si-Fe键,抑制Fe漏并提高ORR性能.
这种方法为为下一代PEMFC设计高效和耐用的ORR电催化剂提供了一个有希望的策略.

关键词:

减少酸性氧的减少氧.双反应场所是双反应场所.格子扩张格子的扩张.在PEMFCs中,PEMFCs可以在PEMFC中使用.多孔的 Si Si 的

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