过电位
电催化剂
催化作用
钌
化学
密度泛函理论
交换电流密度
氢
吉布斯自由能
无机化学
物理化学
电化学
计算化学
电极
热力学
有机化学
塔菲尔方程
物理
作者
Yuanmeng Zhao,Xuewei Wang,Zhen Li,Pingping Zhao,Congliang Tao,Gongzhen Cheng,Wei Luo
标识
DOI:10.1016/j.cclet.2021.05.038
摘要
Exploring highly efficient electrocatalysts and understanding the reaction mechanisms for hydrogen electrocatalysis, including hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) in alkaline media are conducive to the conversion of hydrogen energy. Herein, we reported a new strategy to boost the HER/HOR performances of ruthenium (Ru) nanoparticles through nitrogen (N) modification. The obtained N-Ru/C exhibit remarkable catalytic performance, with normalized HOR exchange current density and mass activity of 0.56 mA/cm2 and 0.54 mA/µg, respectively, about 4 and 4.5 times higher than those of Ru/C, and even twofold enhancement compared to commercial Pt/C. Moreover, at the overpotential of 50 mV, the normalized HER current density of N-Ru/C is 5.5 times higher than that of Ru/C. Experimental and density functional theory (DFT) results verify the electronic regulation of Ru after N incorporation, resulting in the optimized hydrogen adsorption Gibbs free energy (ΔGH*) and hence enhancing the HOR/HER performance.
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