催化作用
材料科学
正交晶系
铂金
过渡金属
硒化物
相(物质)
无机化学
化学工程
吸附
离解(化学)
结晶学
化学
物理化学
有机化学
晶体结构
冶金
硒
工程类
作者
Jun Zhang,Chuanqi Cheng,Liyang Xiao,Cong Han,Xueru Zhao,Pengfei Yin,Cunku Dong,Hui Liu,Xi‐Wen Du,Jing Yang
标识
DOI:10.1002/adma.202401880
摘要
Abstract Cost‐effective transition metal chalcogenides (TMCs) are highly promising electrocatalysts for both alkaline and acidic hydrogen evolution reactions (HER). However, unsatisfactory HER kinetics and stability have severely hindered their applications in industrial water electrolysis. Herein, a nanoflowers‐shaped W‐doped cubic/orthorhombic phase‐mixed CoSe 2 catalyst ((c/o)‐CoSe 2 ‐W) is reported. The W doping induces spontaneous phase transition from stable phase cubic CoSe 2 to metastable phase orthorhombic CoSe 2 , which not only enables precise regulation of the ratio of two phases, but also realizes W doping at the interfaces of two phases. The (c/o)‐CoSe 2 ‐W catalyst exhibits a Pt‐like HER activity in both alkaline and acidic media, with record‐low HER overpotentials of 29.8 mV (alkaline) and 35.9 mV (acidic) at 10 mA cm −2 , respectively, surpassing the vast majority of previously reported non‐precious metal electrocatalysts for both alkaline and acidic HER. The Pt‐like HER activities originate from the formation of Co‐Se‐W active species on the c‐CoSe 2 side at the phase interface, which effectively modulates electron structures of active sites, not only enhancing H 2 O adsorption and dissociation at Co sites, but also optimizing H * adsorption to Δ G H* ≈ 0 at W sites. Benefiting from the abundant phase interfaces, the catalyst also displays outstanding long‐term durability in both acidic and alkaline media. This article is protected by copyright. All rights reserved
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