期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-27664-z
关键词
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资金
- National Key Research and Development Program of China [2017YFA0402802]
- National Natural Science Foundation of China [21776265, 51902304, 52072358]
- Anhui Provincial Natural Science Foundation [1908085ME122]
- Fundamental Research Funds for the Central Universities [Wk2060140026, WK3430000005]
- PetroChina
This article presents a method to fabricate high surface distribution density iridium single-atom catalysts and investigates their activity and stability in water oxidation reactions. The results show that the fabricated iridium single-atom catalyst exhibits low overpotential and high turnover frequency in 1.0M KOH solution, as well as high stability.
Single-atom catalysts (SACs) have attracted tremendous research interests in various energy-related fields because of their high activity, selectivity and 100% atom utilization. However, it is still a challenge to enhance the intrinsic and specific activity of SACs. Herein, we present an approach to fabricate a high surface distribution density of iridium (Ir) SAC on nickel-iron sulfide nanosheet arrays substrate (Ir1/NFS), which delivers a high water oxidation activity. The Ir1/NFS catalyst offers a low overpotential of similar to 170 mV at a current density of 10 mA cm(-2) and a high turnover frequency of 9.85 s(-1) at an overpotential of 300 mV in 1.0M KOH solution. At the same time, the Ir1/NFS catalyst exhibits a high stability performance, reaching a lifespan up to 350 hours at a current density of 100 mA cm(-2). Firstprinciples calculations reveal that the electronic structures of Ir atoms are significantly regulated by the sulfide substrate, endowing an energetically favorable reaction pathway. This work represents a promising strategy to fabricate high surface distribution density single-atom catalysts with high activity and durability for electrochemical water splitting.
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