电催化剂
氧还原反应
金属间化合物
氧还原
材料科学
纳米技术
还原(数学)
析氧
化学
冶金
电化学
电极
物理化学
数学
几何学
合金
作者
Zhiping Deng,Zhe Gong,Mingxing Gong,Xiaolei Wang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-03-22
标识
DOI:10.1021/acs.nanolett.4c00583
摘要
Transforming the Pt–M alloy into an ordered intermetallic is an effective strategy to improve the electrocatalytic activity and stability toward the oxygen reduction reaction (ORR). However, the synthesis of nanosized intermetallics remains challenging. Herein, we report an efficient ORR electrocatalyst, consisting of a monodisperse nanosized PtCu intermetallic on hollow mesoporous carbon spheres (HMCS). As predicted by theoretical calculations, PtCu intermetallics exhibit beneficial electronic structure, with a low theoretical overpotential of 0.33 V and enhanced Cu stability. Resulting from the multiscale modulation of catalyst structure, the O-PtCu/HMCS catalyst delivers a high mass activity of 2.73 A cm–2Pt at 0.9 V and remarkable stability. Identical location transmission electron microscopy (IL-TEM) investigations demonstrate that the rate of carbon corrosion is alleviated on HMCS, which contributes to the long-term durability. This work provides a promising design strategy for an ORR electrocatalyst, and the IL-TEM investigations offer new perspectives for the performance enhancement mechanism.
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