过电位
塔菲尔方程
催化作用
材料科学
分解水
制氢
氢
无机化学
化学工程
化学
物理化学
电极
电化学
光催化
工程类
生物化学
有机化学
作者
Hongming Sun,Zhenhua Yan,Caiying Tian,Li Cha,Xinliang Feng,Rong Huang,Yinghui Lan,Jing Chen,Chengpeng Li,Zhihong Zhang,Miao Du
标识
DOI:10.1038/s41467-022-31561-4
摘要
The active-site density, intrinsic activity, and durability of Ni-based catalysts are critical to their application in industrial alkaline water electrolysis. This work develops a kind of promoters, the bixbyite-type lanthanide metal sesquioxides (Ln2O3), which can be implanted into metallic Ni by selective high-temperature reduction to achieve highly efficient Ni/Ln2O3 hybrid electrocatalysts toward hydrogen evolution reaction. The screened Ni/Yb2O3 catalyst shows the low overpotential (20.0 mV at 10 mA cm-2), low Tafel slope (44.6 mV dec-1), and excellent long-term durability (360 h at 500 mA cm-2), significantly outperforming the metallic Ni and benchmark Pt/C catalysts. The remarkable hydrogen evolution activity and stability of Ni/Yb2O3 are attributed to that the Yb2O3 promoter with high oxophilicity and thermodynamic stability can greatly enlarge the active-site density, reduce the energy barrier of water dissociation, optimize the free energy of hydrogen adsorption, and avoid the oxidation corrosion of Ni.
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