High-temperature annealing improves Pt utilization of proton exchange membrane fuel cell cathode catalysts

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-05-13 DOI:10.1007/s40843-024-2871-1

Junjie Li (, ), Zirui Li (, ), Shuai Li (, ), Cong Xu (, ), Ang Li (, ), Lei Tong (, ), Haiwei Liang (, )

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Abstract

High-temperature annealing is widely recognized as an effective way to improve the durability of Pt/C cathode catalysts used in proton exchange membrane fuel cells (PEMFCs), yet systematic studies on its effects on PEMFC performance are still lacking. Herein, we explore the effect of high-temperature annealing on the PEMFC performance, based on a thorough comparative analysis of Pt/C catalysts annealed at temperatures ranging from 500–900°C. Our results reveal that high-temperature annealing not only enhances the catalyst durability but also substantially increases Pt utilization, which in turn drives the increase in mass activity and the enhancement of low-current-density performance. Based on an array of electrochemical and physical characterization results, we infer that the increased utilization of Pt might stem from nanoparticle migration induced by high-temperature annealing, leading to closer proximity between Pt nanoparticles and ionomers. This reduced distance potentially enhances the accessibility of protons to the Pt nanoparticles, thereby improving the Pt utilization.

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高温退火提升质子交换膜燃料电池阴极催化剂的铂利用率

高温退火被公认为是提高质子交换膜燃料电池（PEMFC）中使用的铂/镍阴极催化剂耐久性的有效方法，但目前仍缺乏有关高温退火对 PEMFC 性能影响的系统研究。在此，我们基于对在 500-900°C 温度下退火的 Pt/C 催化剂的全面比较分析，探讨了高温退火对 PEMFC 性能的影响。我们的研究结果表明，高温退火不仅能提高催化剂的耐久性，还能大幅提高铂的利用率，进而推动质量活性的提高和低电流密度性能的增强。根据一系列电化学和物理表征结果，我们推断铂利用率的提高可能源于高温退火引起的纳米粒子迁移，导致铂纳米粒子和离子体之间的距离更近。距离的缩短可能会提高质子与铂纳米粒子的接触机会，从而提高铂的利用率。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.