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Low‐Iridium‐Content IrNiTa Metallic Glass Films as Intrinsically Active Catalysts for Hydrogen Evolution Reaction
Author(s) -
Wang ZiJian,
Li MingXing,
Yu JiHao,
Ge XingBo,
Liu YanHui,
Wang WeiHua
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201906384
Subject(s) - overpotential , catalysis , materials science , iridium , amorphous metal , tafel equation , amorphous solid , metal , chemical engineering , alloy , precious metal , hydrogen , nanotechnology , metallurgy , electrochemistry , chemistry , crystallography , organic chemistry , electrode , engineering
Although various catalytic materials have emerged for hydrogen evolution reaction (HER), it remains crucial to develop intrinsically effective catalysts with minimum uses of expensive and scarce precious metals. Metallic glasses (MGs) or amorphous alloys show up as attractive HER catalysts, but have so far limited to material forms and compositions that result in high precious‐metal loadings. Here, an Ir 25 Ni 33 Ta 42 MG nanofilm exhibiting high intrinsic activity and superior stability at an ultralow Ir loading of 8.14 µg cm −2 for HER in 0.5 m H 2 SO 4 is reported. With an overpotential of 99 mV for a current density of 10 mA cm −2 , a small Tafel slope of 35 mV dec −1 , and high turnover frequencies of 1.76 and 19.3 H 2 s −1 at 50 and 100 mV overpotentials, the glassy film is among the most intrinsically active HER catalysts, outcompetes any reported MG, representative sulfides, and phosphides, and compares favorably with other precious‐metal‐containing catalysts. The outstanding HER performance of the Ir 25 Ni 33 Ta 42 MG film is attributed to the synergistic effect of the novel alloy system and amorphous structure, which may inspire the development of multicomponent alloys for heterogeneous catalysis.