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Non-metal Single-Iodine-Atom Electrocatalysts for the Hydrogen Evolution Reaction
Yongqiang Zhao1, Tao Ling2, Shuangming Chen3
1Center for Materials in Energy and Catalysis, School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA, 5005, Australia.
We developed a novel single-atom nickel iodide catalyst (SANi-I) for efficient hydrogen evolution reactions (HER). This common-metal catalyst uses atomically dispersed iodine for enhanced electrocatalysis.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Designing common-metal-based single-atom catalysts (SACs) is challenging due to complex synthesis.
- Atomically dispersed non-metal atoms offer unique catalytic properties.
Purpose of the Study:
- To report a novel single-atom nickel iodide (SANi-I) electrocatalyst.
- To investigate its structure and electrocatalytic activity for the hydrogen evolution reaction (HER).
Main Methods:
- Simple vacuum calcination and cyclic voltammetry activation for SANi-I synthesis.
- Aberration-corrected HAADF-STEM and synchrotron-based XAS for structural characterization.
- In situ Raman spectroscopy to study reaction intermediates.
Main Results:
- SANi-I features atomically dispersed iodine atoms isolated by oxygen.
- The catalyst exhibits structural stability and exceptional HER electrocatalytic activity.
- In situ Raman confirmed I-Hads intermediate formation on single iodine atoms.
Conclusions:
- A facile synthesis method for SANi-I was established.
- The SANi-I catalyst demonstrates high efficiency for the hydrogen evolution reaction.
- Single iodine atoms play a crucial role in promoting the HER via I-Hads intermediates.
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