Atomic iridium@cobalt nanosheets for dinuclear tandem water oxidation
- 7 March 2019
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 7 (14), 8376-8383
- https://doi.org/10.1039/c9ta01088b
Abstract
Atomization of noble metals enable their electrocatalysis applications with low cost, whereas the isolated mononuclear site after atomization might lead leads to limited performance. Herein, we present a general strategy of atomically confined alloying (ACA) to synthesize an electrocatalyst of single atom iridium-trapping cobalt nanosheets with dual-reactive Ir–Co sites. The atomic Ir@Co nanosheets (1.7 wt% Ir) exhibit excellent oxygen evolution reaction (OER) performance with a small overpotential (273 mV at 10 mA cm−2) and high stability, higher than that of the Ir/C catalyst (290 mV at 10 mA cm−2). More importantly, density functional theory (DFT) calculations combined with experiments demonstrated that water oxidation proceeded on atomic Ir@Co nanosheets via a dinuclear tandem mechanism, in which Ir–Co dual sites cooperatively worked in favour of the sequential transfer from Co–OH* to Ir–O* via a Co–O–Ir intermediate, and stabilization of OOH* species by hydrogen bonding interaction. The cooperative mechanism based on a dinuclear electrocatalyst by ACA is hoped to open up more possibilities of single atom noble metal electrocatalysts for various applications.Keywords
Funding Information
- Chinese Academy of Sciences (XDB20000000)
- National Natural Science Foundation of China (21601190, 21501173)
- Natural Science Foundation of Fujian Province (2018J05030)
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