X射线光电子能谱
催化作用
材料科学
纳米颗粒
电催化剂
化学工程
可逆氢电极
氧气
X射线吸收光谱法
电化学
纳米技术
吸收光谱法
电极
化学
物理化学
工作电极
生物化学
物理
有机化学
量子力学
工程类
作者
Hua‐Yi Kuang,Zhiyuan Xu,Xin Tan,Ke Yu,Chen Chen
出处
期刊:Small
[Wiley]
日期:2024-01-14
标识
DOI:10.1002/smll.202308421
摘要
Abstract High‐entropy alloys nanoparticles (HEAs NPs) have gained considerable attention due to their extensive compositional tunability and intriguing catalytic properties. However, the synthesis of highly dispersed ultrasmall HEAs NPs remains a formidable challenge due to their inherent thermodynamic instability. In this study, highly dispersed ultrasmall ( ca . 2 nm) PtCuGaFeCo HEAs NPs are synthesized using a one‐pot solution‐based method at 160 °C and atmospheric pressure. The PtCuGaFeCo NPs exhibit good catalytic activity for the oxygen reduction reaction (ORR). The half‐wave potential relative to the reversible hydrogen electrode (RHE) reaches 0.88 V, and the mass activity and specific activity are approximately six times and four times higher than that of the commercial Pt/C catalyst. Based on X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption spectroscopy (XAS) analyses, the surface strain and optimized coordination environments of PtCuGaFeCo have led to high ORR activities in acidic media. Moreover, the ultrasmall size also plays an important role in enhancing catalytic performance. The work presents a facile and viable synthesis strategy for preparing the ultrasmall HEAs NPs, offering great potential in energy and electrocatalysis applications through entropy engineering.
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