金属间化合物
电催化剂
铂金
铜
磷酸盐
质子交换膜燃料电池
材料科学
化学
无机化学
冶金
催化作用
电极
电化学
合金
有机化学
物理化学
作者
Wenrui Zhang,Shengming Xu,Yunxu Yang,Qingwei Gao,Sheng Zhu,Kan Ding,Qiaoxia Li,Penghui Shi,Yulin Min
标识
DOI:10.1016/j.cej.2024.150348
摘要
In high-temperature proton exchange membrane fuel cells (HT-PEMFC), phosphate anions act as a poisonous 'spectator species', binding strongly to the Pt surface through PtO bonds similarly to O2. This blocks the Pt active sites, resulting in slow ORR kinetics. Herein, we synthesized ultrafine L11-PtCu intermetallic compound nanoparticles (O-PtCu/S-C) loaded on an S-doped carbon support with an average size of about 3 nm through wet impregnation followed by hydrogen annealing, which showed high resistance to phosphate poisoning. The introduction of S notably improved the metal-support interaction and prevented particle growth during annealing, which is beneficial for the uniform distribution of nanoparticles and prevents detachment and agglomeration during ADT. The pronounced Cu-Pt electronic interaction in O-PtCu/S-C induced electron transfer from Cu to Pt, which effectively modified the electronic structure of Pt and weakened the adsorption energy of phosphate anions on the catalyst surface. In addition, the phosphate poisoning test results from both room temperature RDE and high-temperature RDE demonstrate that O-PtCu/S-C possesses excellent phosphate tolerance, superior ORR activity, and remarkable stability. It exhibits a superior peak power density of 800.5 mW cm−2 in 160℃ H2-O2 HT-PEMFC with Pt loading of 0.5 mg cm−2. This research offers a novel approach to designing phosphate-resistant electrocatalysts for HT-PEMFC.
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