Electron Density Modulation of MoO 2 /Ni to Produce Superior Hydrogen Evolution and Oxidation Activities

作者：Wanli Liang, Pengyu Dong, Zhichen Le, Xinyi Lin, Xiyu Gong, Fangyan Xie, Hao Zhang, Jian Chen, Nan Wang, Yanshuo Jin, Hui Meng · 发表于：ACS Applied Materials & Interfaces · 年份：2021 · DOI：10.1021/acsami.1c11025 · 被引用次数：42 · 研究领域：Electrocatalysts for Energy Conversion、Catalytic Processes in Materials Science、Advanced Photocatalysis Techniques

Hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) have aroused great interest, but the high price of platinum group metals (PGMs) limits their development. The electronic reconstruction at the interface of a heterostructure is a promising strategy to enhance their catalytic performance. Here, MoO 2 /Ni heterostructure was synthesized to provide effective HER in an alkaline electrolyte and exhibit excellent HOR performance. Theoretical and experimental analyses prove that the electron density around the Ni atom is reduced. The electron density modulation optimizes the hydrogen adsorption and hydroxide adsorption free energy, which can effectively improve the activity of both HER and HOR. Accordingly, the prepared MoO 2 /Ni@NF catalyst reveals robust HER activity (η 10 = 50.48 mV) and HOR activity ( j 0 = ∼1.21 mA cm –2 ). This work demonstrates an effective method to design heterostructure interfaces and tailor the surface electronic structure to improve HER/HOR performance.