过电位
塔菲尔方程
电催化剂
催化作用
双金属片
电解质
分解水
材料科学
化学工程
电化学
无机化学
化学
物理化学
电极
有机化学
光催化
工程类
作者
Mengya Yang,Long Jiao,Huilong Dong,Liujiang Zhou,Changqing Teng,Dongming Yan,Tian‐Nan Ye,Xiaoxin Chen,Yi Liu,Hai‐Long Jiang
标识
DOI:10.1016/j.scib.2020.06.036
摘要
The rational design and construction of inexpensive and highly active electrocatalysts for hydrogen evolution reaction (HER) is of great importance for water splitting. Herein, we develop a facile approach for preparation of porous carbon-confined Ru-doped Cu nanoparticles (denoted as Ru-Cu@C) by direct pyrolysis of the Ru-exchanged Cu-BTC metal-organic framework. When served as the electrocatalyst for HER, strikingly, the obtained Ru-Cu@C catalyst exhibits an ultralow overpotential (only 20 mV at 10 mA cm-2) with a small Tafel slope of 37 mV dec-1 in alkaline electrolyte. The excellent performance is comparable or even superior to that of commercial Pt/C catalyst. Density functional theory (DFT) calculations confirm that introducing Ru atoms into Cu nanocrystals can significantly alter the desorption of H2 to achieve a close-to-zero hydrogen adsorption energy and thereby boost the HER process. This strategy gives a fresh impetus to explore low-cost and high-performance catalysts for HER in alkaline media.
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