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Type: Journal article
Title: Non-metal single-iodine-atom electrocatalysts for the hydrogen evolution reaction
Author: Zhao, Y.
Ling, T.
Chen, S.
Jin, B.
Vasileff, A.
Jiao, Y.
Song, L.
Luo, J.
Qiao, S.Z.
Citation: Angewandte Chemie International Edition, 2019; 58(35):12252-12257
Publisher: Wiley
Issue Date: 2019
ISSN: 1433-7851
Statement of
Yongqiang Zhao, Tao Ling, Shuangming Chen, Bo Jin, Anthony Vasileff, Yan Jiao, Li Song, Jun Luo, and Shi-Zhang Qiao
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 (Hads ) is adsorbed by a single iodine atom, forming the I-Hads intermediate, which promotes the HER process.
Keywords: Iodine; non-metal single-atom catalysts; hydrogen evolution reaction; overall water splitting; single-atom catalysts
Rights: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/anie.201905554
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Chemical Engineering publications

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