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Non‐metal Single‐Iodine‐Atom Electrocatalysts for the Hydrogen Evolution Reaction
Author(s) -
Zhao Yongqiang,
Ling Tao,
Chen Shuangming,
Jin Bo,
Vasileff Anthony,
Jiao Yan,
Song Li,
Luo Jun,
Qiao ShiZhang
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201905554
Subject(s) - electrocatalyst , iodide , hydrogen iodide , chemistry , materials science , hydrogen , inorganic chemistry , electrochemistry , organic chemistry , electrode
Abstract Common‐metal‐based single‐atom catalysts (SACs) are quite difficult to design due to the complex synthesis processes required. Herein, we report a single‐atom nickel iodide (SANi‐I) electrocatalyst with atomically dispersed non‐metal iodine atoms. The SANi‐I is prepared via a simple calcination step in a vacuum‐sealed ampoule and subsequent cyclic voltammetry activation. Aberration‐corrected high‐angle annular dark‐field scanning transmission electron microscopy and synchrotron‐based X‐ray absorption spectroscopy are applied to confirm the atomic‐level dispersion of iodine atoms and detailed structure of SANi‐I. Single iodine atoms are found to be isolated by oxygen atoms. The SANi‐I is structural stable and shows exceptional electrocatalytic activity for the hydrogen evolution reaction (HER). In situ Raman spectroscopy reveals that the hydrogen adatom (H ads ) is adsorbed by a single iodine atom, forming the I‐H ads intermediate, which promotes the HER process.