过电位
电催化剂
催化作用
电子转移
氧化还原
材料科学
化学工程
电化学
甲醇
化学
无机化学
合金
电极
光化学
物理化学
冶金
有机化学
工程类
生物化学
作者
Hongdong Li,Yi Han,Huan Zhao,Wenjing Qi,Dan Zhang,Yaodong Yu,Wenwen Cai,Shaoxiang Li,Jianping Lai,Bolong Huang,Lei Wang
标识
DOI:10.1038/s41467-020-19277-9
摘要
Abstract Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and ultrasmall (~3.4 nm) high-entropy alloys (HEAs) Pt 18 Ni 26 Fe 15 Co 14 Cu 27 nanoparticles are synthesized by a simple low-temperature oil phase strategy at atmospheric pressure. The Pt 18 Ni 26 Fe 15 Co 14 Cu 27 /C catalyst exhibits excellent electrocatalytic performance for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The catalyst shows ultrasmall overpotential of 11 mV at the current density of 10 mA cm −2 , excellent activity (10.96 A mg −1 Pt at −0.07 V vs. reversible hydrogen electrode) and stability in the alkaline medium. Furthermore, it is also the efficient catalyst (15.04 A mg −1 Pt ) ever reported for MOR in alkaline solution. Periodic DFT calculations confirm the multi-active sites for both HER and MOR on the HEA surface as the key factor for both proton and intermediate transformation. Meanwhile, the construction of HEA surfaces supplies the fast site-to-site electron transfer for both reduction and oxidation processes.
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