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One-step synthesis of hierarchical porous CoFe layered double hydroxide nanosheets with optimizing composition for enhanced oxygen evolution electrocatalysis

Abstract

Hierarchical porous CoFe-LDHs composed of ultrathin nanosheets is successfully prepared by a simple one-step precipitation process of Co2+ and Fe3+ ions, avoiding the multiple tedious steps. The optimized composition and the hierarchical porous structure design endow CoFe-LDHs with high activity for OER in alkaline media (1 M KOH). Benefiting from the synergistic catalytic effects of the controllable composition and the structural features of CoFe-LDHs, the superior OER performance of hierarchical porous Co8Fe1-LDH nanosheets with the optimal composition is achieved with the smallest overpotential (262 mV at 10 mA cm−2), lowest Tafel slope (42 mV per decade), and excellently long-term stability, which is superior to the previously reported LDH-derived and the commercial iridium dioxide (IrO2) electrocatalysts, suggesting its promising application as an efficient electrode for OER.

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Publication details

The article was received on 27 Oct 2019, accepted on 24 Nov 2019 and first published on 25 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01394F
Inorg. Chem. Front., 2019, Accepted Manuscript

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    One-step synthesis of hierarchical porous CoFe layered double hydroxide nanosheets with optimizing composition for enhanced oxygen evolution electrocatalysis

    J. Zhao, X. Wang, F. Chen, C. He, X. wang, Y. Li , R. Liu, X. Chen, Y. hao, M. Yang and F. Li, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI01394F

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