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Fe-N-C 提高了燃料电池支的纳米颗粒的稳定性

Fei Xiao¹, Yian Wang¹, Gui-Liang Xu²

¹Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon999077, Hong Kong, China.

Journal of the American Chemical Society

|October 25, 2022

概括

通过减少溶解和增强纳米粒子稳定性,铁和编碳 (Fe-N-C) 支持显著提高燃料电池中的基催化剂的耐用性.

科学领域:

材料科学
电化学
催化剂

背景情况:

聚合物电解质燃料电池需要耐用电催化剂进行长期应用.
传统碳黑支上的基纳米颗粒的耐用性很差.
铁和合碳 (Fe-N-C) 是一个有前途的替代支材料.

研究的目的:

与商业Pt/C相比,评估支持Fe-N-C的纳米颗粒的耐用性.
研究Fe-N-C支物中增强催化剂稳定性的机制.

主要方法:

在酸性和基本性介质中的电化学电位循环.
在现场感应合等离子体质谱 (ICP-MS) 用于测量溶解.
密度功能理论 (DFT) 计算以分析金属基板相互作用和电子结构.

主要成果:

与Pt/Fe-N-C相比,Pt/Fe-N-C具有更高的电化学表面积保留.
的溶解率是Pt/Fe-N-C的三倍,而不是Pt/C.
DFT计算显示了Fe-N-C的强烈金属基板相互作用和减少氧化物形成.

结论:

Fe-N-C为纳米颗粒提供了更稳定的支,减少溶解并提高耐用性.
这种增强的稳定性归因于Fe-N-C的强烈金属基底相互作用和有利的电子特性.
选择合适的碳支是开发燃料电池耐用的白金电催化剂的关键.

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