过电位
催化作用
氢溢流
电化学
可逆氢电极
电极
密度泛函理论
电极电位
氢
溢出效应
吸附
化学物理
化学
纳米技术
材料科学
参比电极
计算化学
物理化学
有机化学
经济
微观经济学
作者
Shangguo Liu,Zijian Li,Yaxiang Chang,Min Gyu Kim,Haeseong Jang,Jaephil Cho,Liqiang Hou,Xien Liu
标识
DOI:10.1002/anie.202400069
摘要
Abstract Although great efforts on the delicate construction of a built‐in electric field (BIEF) to modify the electronic properties of active sites have been conducted, the substantial impact of BIEF coupled with electrode potential on the electrochemical reactions has not been clearly investigated. Herein, we designed an alkaline hydrogen evolution reaction (HER) catalyst composed of heterogeneous Ru−CoP urchin arrays on carbon cloth (Ru−CoP/CC) with a strong BIEF with the guidance of density functional theory (DFT) calculations. Impressively, despite its unsatisfactory activity at 10 mA cm −2 (overpotential of 44 mV), Ru−CoP/CC exhibited better activity (357 mV) than the benchmark Pt/C catalyst (505 mV) at 1 A cm −2 . Experimental and theoretical studies revealed that strong hydrogen adsorption on the interfacial Ru atoms created a high energy barrier for hydrogen desorption and spillover, resulting in unsatisfactory activity at low current densities. However, as the electrode potential became more negative (i.e., the current density increased), the barrier for hydrogen spillover from the interfacial Ru to the Co site, which had near‐zero hydrogen adsorption energy, significantly decreased, thus greatly accelerating the whole alkaline HER process. This explains why the activity of Ru−CoP is relatively susceptible to the electrode potential compared to Pt/C.
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