Intermetallic compounds with high hydrogen evolution reaction performance:a case study of a MCo2 (M= Ti, Zr, Hf and Sc) series
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초록
내용
Noble metals (e.g. Ru, Ir and Pt) or their derivatives exhibit very appealing activity toward hydrogen evolution reaction (HER), however, the high price and low reserve all impede their widely use. Herein, we propose a strategy that through the manipulation of crystal and electronic structure, one can turn common metal to have Pt-like performance of HER. To achieve this goal, a series of MCo2 (M = Ti, Zr, Hf and Sc) has been synthesized by using rapid arc-melting method. TiCo2 exhibits comparable HER activity to that of Pt/C, which it only requires -70 mV (V vs RHE) to reach 10 mA/ cm2 with Tafel slope of 33 mV•decade-1 in 1.0 M KOH. This case study offers a good illustration to transfer non-noble metal to behave like noble metal toward HER and potentially can be applied in other aspects.