材料科学
催化作用
质子交换膜燃料电池
合金
溶解
耐久性
过渡金属
空位缺陷
兴奋剂
电催化剂
相(物质)
氢
可逆氢电极
铂金
化学工程
电化学
电极
冶金
化学
物理化学
复合材料
结晶学
工作电极
光电子学
生物化学
有机化学
工程类
作者
Xiaoke Li,Xiao Duan,Siao Zhang,Chuanjie Wang,Hua Ke,Zejin Wang,Yongkang Wu,Jia Li,Jianguo Liu
标识
DOI:10.1002/anie.202400549
摘要
The stability of platinum‐based alloy catalysts is crucial for the future development of proton exchange membrane fuel cells, considering the potential dissolution of transition metals under complex operating conditions. Here, we report on a Rh‐doped Pt3Co alloy that exhibits strong interatomic interactions, thereby enhancing the durability of fuel cells. The Rh‐Pt3Co/C catalyst demonstrates exceptional catalytic activity for oxygen reduction reactions (ORR) (1.31 A mgPt‐1 at 0.9 V vs. the reversible hydrogen electrode (RHE) and maintaining 92% of its mass activity after 170,000 potential cycles). Long‐term testing has shown direct inhibition of Co dissolution in Rh‐Pt3Co/C. Furthermore, tests on proton exchange membrane fuel cells (PEMFC) have shown excellent performance and long‐term durability with low Pt loading. After 50,000 cycles, there was no voltage loss at 0.8 A cm‐2 for Rh‐Pt3Co/C, while Pt3Co/C experienced a loss of 200 mV. Theoretical calculations suggest that introducing transition metal atoms through doping creates a stronger compressive strain, which in turn leads to increased catalytic activity. Additionally, Rh doping increases the energy barrier for Co diffusion in the bulk phase, while also raising the vacancy formation energy of the surface Pt. This ensures the long‐term stability of the alloy over the course of the cycle.
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