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Single Tungsten Atoms Supported on MOF‐Derived N‐Doped Carbon for Robust Electrochemical Hydrogen Evolution
Author(s) -
Chen Wenxing,
Pei Jiajing,
He ChunTing,
Wan Jiawei,
Ren Hanlin,
Wang Yu,
Dong Juncai,
Wu Konglin,
Cheong WengChon,
Mao Junjie,
Zheng Xusheng,
Yan Wensheng,
Zhuang Zhongbin,
Chen Chen,
Peng Qing,
Wang Dingsheng,
Li Yadong
Publication year - 2018
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.201800396
Subject(s) - tafel equation , overpotential , materials science , scanning transmission electron microscopy , x ray absorption fine structure , density functional theory , catalysis , tungsten , carbon fibers , electrochemistry , chemistry , nanotechnology , spectroscopy , transmission electron microscopy , computational chemistry , organic chemistry , electrode , physics , quantum mechanics , metallurgy , composite material , composite number
Tungsten‐based catalysts are promising candidates to generate hydrogen effectively. In this work, a single‐W‐atom catalyst supported on metal–organic framework (MOF)‐derived N‐doped carbon (W‐SAC) for efficient electrochemical hydrogen evolution reaction (HER), with high activity and excellent stability is reported. High‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) and X‐ray absorption fine structure (XAFS) spectroscopy analysis indicate the atomic dispersion of the W species, and reveal that the W 1 N 1 C 3 moiety may be the favored local structure for the W species. The W‐SAC exhibits a low overpotential of 85 mV at a current density of 10 mA cm −2 and a small Tafel slope of 53 mV dec −1 , in 0.1 m KOH solution. The HER activity of the W‐SAC is almost equal to that of commercial Pt/C. Density functional theory (DFT) calculation suggests that the unique structure of the W 1 N 1 C 3 moiety plays an important role in enhancing the HER performance. This work gives new insights into the investigation of efficient and practical W‐based HER catalysts.