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- Title
Non‐metal Single‐Iodine‐Atom Electrocatalysts for the Hydrogen Evolution Reaction.
- Authors
Zhao, Yongqiang; Ling, Tao; Chen, Shuangming; Jin, Bo; Vasileff, Anthony; Jiao, Yan; Song, Li; Luo, Jun; Qiao, Shi‐Zhang
- 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.
- Subjects
HYDROGEN evolution reactions; IODINE; SCANNING transmission electron microscopy; X-ray absorption; CYCLIC voltammetry; X-ray spectroscopy
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 35, p12380
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201905554