Pan Hai-Rui, Tang Tang, Jiang Zhe, Ding Liang, Xu Cailing, Hu Jin-Song
State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
J Phys Chem Lett. 2024 Mar 21;15(11):3011-3022. doi: 10.1021/acs.jpclett.4c00027. Epub 2024 Mar 11.
The severe performance degradation of low-temperature hydrogen fuel cells upon exposure to trace amounts of carbon monoxide (CO) impurities in reformate hydrogen fuels is one of the challenges that hinders their commercialization. Despite significant efforts that have been made, the CO-tolerance performance of electrocatalysts for the hydrogen oxidation reaction (HOR) is still unsatisfactory. This Perspective discusses the path forward for the rational design of CO-tolerant HOR electrocatalysts. The fundamentals of the CO-tolerant mechanisms on commercialized platinum group metal (PGM) electrocatalysts via either promoting CO electrooxidation or weakening CO adsorption are provided, and comprehensive discussions based on these strategies are presented with typical examples. Given the recent progress, some emerging strategies, including blocking CO diffusion with a barrier layer and developing non-PGM HOR catalysts, are also discussed. We conclude with a discussion of the strengths and limitations of these strategies along with the perspectives of the major challenges and opportunities for future research on CO-tolerant HOR electrocatalysts.
低温氢燃料电池在暴露于重整氢燃料中痕量一氧化碳（CO）杂质时性能严重下降，这是阻碍其商业化的挑战之一。尽管已经付出了巨大努力，但用于氢氧化反应（HOR）的电催化剂的抗CO性能仍不尽人意。本文探讨了合理设计耐CO的HOR电催化剂的前进方向。介绍了通过促进CO电氧化或减弱CO吸附作用实现商业化铂族金属（PGM）电催化剂耐CO机制的基本原理，并结合典型实例对这些策略进行了全面讨论。鉴于最近的进展，还讨论了一些新兴策略，包括用阻挡层阻止CO扩散和开发非PGM HOR催化剂。我们最后讨论了这些策略的优缺点，以及未来耐CO的HOR电催化剂研究面临的主要挑战和机遇。
