异质结
催化作用
材料科学
合金
质子交换膜燃料电池
电化学
溶解
氧还原反应
化学工程
钴
燃料电池
纳米技术
无机化学
化学
电极
光电子学
物理化学
冶金
工程类
生物化学
作者
Jinli Chen,Guangfu Qian,Bingxian Chu,Zexing Jiang,Kexin Tan,Lin Luo,Bin Li,Shibin Yin
出处
期刊:Small
[Wiley]
日期:2022-01-22
卷期号:18 (12)
被引量:55
标识
DOI:10.1002/smll.202106773
摘要
The development of efficient and stable Pt-based catalysts is significant but challenging for fuel cells. Herein, Sn and Co elements are introduced into Pt to form PtCo-PtSn/C heterostructure for enhancing the oxygen reduction reaction (ORR). Electrochemical results indicate that it has remarkable ORR intrinsic activity with a high mass activity (1,158 mA mg-1 Pt) at 0.9 V in HClO4 solution, which is 2.18-, 6.81-, and 9.98-fold higher than that of PtCo/C, PtSn/C, and Pt/C. More importantly, the catalytic activity attenuation for PtCo-PtSn/C is only 27.4% after 30 000 potential cycles, showing high stability. Furthermore, theoretical calculations reveal that the enhancement is attributed to charge transfer and the unique structure of PtCo-PtSn/C heterostructure, which regulate the d-band center of Pt and prevent non-noble metals from further dissolution. This work thus opens a way to design and prepare highly efficient Pt-based alloy catalysts for proton exchange membrane fuel cells.
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