过电位
材料科学
电催化剂
磷化物
铂金
双金属片
离解(化学)
化学工程
解吸
催化作用
密度泛函理论
过渡金属
纳米技术
无机化学
吸附
物理化学
电极
金属
计算化学
化学
电化学
冶金
工程类
生物化学
作者
Yeshu Tan,Jianrui Feng,Haobo Dong,Longxiang Liu,Siyu Zhao,Feili Lai,Tianxi Liu,Ying Bai,Ivan P. Parkin,Guanjie He
标识
DOI:10.1002/adfm.202209967
摘要
Abstract Platinum (Pt) is regarded as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its application in an alkaline medium is limited by the activation energy of water dissociation, diffusion of H + , and desorption of H*. Moreover, the formation of effective structures with a low Pt usage amount is still a challenge. Herein, guided by the simulation discovery that the edge effect can boost local electric field (LEF) of the electrocatalysts for faster proton diffusion, platinum nanocrystals on the edge of transition metal phosphide nanosheets are fabricated. The unique heterostructure with ultralow Pt amount delivered an outstanding HER performance in an alkaline medium with a small overpotential of 44.5 mV and excellent stability for 80 h at the current density of −10 mA cm −2 . The mass activity of as‐prepared electrocatalyst is 2.77 A mg −1 Pt , which is 15 times higher than that of commercial Pt/C electrocatalysts (0.18 A mg −1 Pt ). The density function theory calculation revealed the efficient water dissociation, fast adsorption, and desorption of protons with hybrid structure. The study provides an innovative strategy to design unique nanostructures for boosting HER performances via achieving both synergistic effects from hybrid components and enhanced LEF from the structural edge effect.
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