催化作用
铂金
材料科学
杰纳斯
质子交换膜燃料电池
氧化物
化学工程
异质结
锡
电化学
氧化锡
纳米材料基催化剂
纳米技术
纳米颗粒
化学
电极
冶金
物理化学
有机化学
光电子学
工程类
作者
Boyan Zhang,Peiyu Ma,Ruyang Wang,Heng Cao,Jun Bao
出处
期刊:Small
[Wiley]
日期:2024-10-02
标识
DOI:10.1002/smll.202405234
摘要
Abstract Designing efficient and durable electrocatalysts for oxygen reduction reaction (ORR) is essential for proton exchange membrane fuel cells (PEMFCs). Platinum‐based catalysts are considered efficient ORR catalysts due to their high activity. However, the degradation of Pt species leads to poor durability of catalysts, limiting their applications in PEMFCs. Herein, a Janus heterostructure is designed for high durability ORR in acidic media. The Janus heterostructure composes of crystalline platinum and cassiterite tin oxide nanoparticles with carbon support (J‐Pt@SnO 2 /C). Based on the synchrotron fine structure analysis and electrochemical investigation, the crystalline reconstruction and charge redistribution at the interface of Janus structure are revealed. The tightly coupled interface could optimize the valance states of Pt and the adsorption/desorption of oxygenated intermediates. As a result, the J‐Pt@SnO 2 /C catalyst possesses distinguishing long‐term stability during the accelerated durability test without obvious degradation after 40 000 cycles and keeps the majority of activity after 70 000 cycles. Meanwhile, the catalyst exhibits outstanding activity with half‐wave potential at 0.905 V and a mass activity of 0.355 A mg Pt −1 (2.7 times higher than Pt/C). The approach of the Janus catalyst paves an avenue for designing highly efficient and stable Pt‐based ORR catalyst in the future implementation.
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