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Phase‐Separated Mo–Ni Alloy for Hydrogen Oxidation and Evolution Reactions with High Activity and Enhanced Stability
Author(s) -
Song Jidong,
Jin Yan Qi,
Zhang Lei,
Dong Pengyu,
Li Jiawang,
Xie Fangyan,
Zhang Hao,
Chen Jian,
Jin Yanshuo,
Meng Hui,
Sun Xueliang
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003511
Subject(s) - materials science , alloy , exchange current density , catalysis , intermetallic , density functional theory , reversible hydrogen electrode , hydrogen , electrochemistry , bimetallic strip , electrolyte , electron transfer , nanoparticle , chemical engineering , metal , inorganic chemistry , electrode , chemistry , nanotechnology , metallurgy , working electrode , biochemistry , computational chemistry , organic chemistry , engineering , tafel equation
The development of alkaline polymer electrolyte fuel cells and alkaline water electrolysis requires nonprecious metal catalysts for the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). Herein, it is reported a phase‐separated Mo–Ni alloy (PS‐MoNi) that is composed of Mo metal and embedded Ni metal nanoparticles. The PS‐MoNi shows excellent hydrogen electrode activity with a high exchange current density (−4.883 mA cm −2 ), which is comparable to the reported highest value for non‐noble catalysts. Moreover, the amorphous phase‐separated Mo–Ni alloy has better structural and electrochemical stability than the intermetallic compound Mo–Ni alloy (IC‐MoNi). The breakdown potential of PS‐MoNi is as high as 0.32 V, which is much higher than that of reported IC‐MoNi. The X‐ray absorption near edge structure (XANES) and density functional theory (DFT) calculations indicate the electrons transfer from Mo to Ni for PS‐MoNi, leading to suitable adsorption free energies of H* (Δ G H* ) on the surface of Mo. This means that the electron density modulation of Mo metal by embedded Ni metal nanoparticles can produce excellent HOR and HER performance.