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Coordination modulation of iridium single-atom catalyst maximizing water oxidation activity
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...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8748886/ https://www.ncbi.nlm.nih.gov/pubmed/35013202 http://dx.doi.org/10.1038/s41467-021-27664-z |
Sumario: | 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 (Ir(1)/NFS), which delivers a high water oxidation activity. The Ir(1)/NFS catalyst offers a low overpotential of ~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 1.0 M KOH solution. At the same time, the Ir(1)/NFS catalyst exhibits a high stability performance, reaching a lifespan up to 350 hours at a current density of 100 mA cm(−2). First-principles 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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