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FexNiy/CeO2 Loaded on N-doped Nanocarbon as an Advanced Bifunctional Electrocatalyst for the Overall Water Splitting

Abstract

Developing the highly efficient and cost-effiective electrocatalyst for catalyzing hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is fundamentally important for the practical application of overall water splitting technique. Herein, a bifunctional electrocatalyst constituted by FexNiy and CeO2 nanoparticles supported on the N-doped nanocarbon (NC) is fabricated by a simple one-pot pyrolysis of the homogeneous mixture of Fe, Ni, Ce nitrates and melamine. The synergistic effect of each component in the FexNiy/CeO2/NC gives rise to outstanding electrocatalytic activities and stability toward HER and OER. For hydrogen evolution, the FexNiy/CeO2/NC shows a smaller overpotential of 260 mV to achieve a current density of 50 mA cm-2 in 1 M KOH electrolyte. More significantly, a small overpotential of 240 mV for FexNiy/CeO2/NC to afford an oxygen evolution current density of 10 mA cm-2, far lower than that of the benchmark IrO2. The practicability and electrocatalytic activity of the prepared FexNiy/CeO2/NC under the practical operation conditions is also investigated. Specially, the FexNiy/CeO2/NC-based overall water splitting cell only needs a cell voltage of 1.70 V to output 10 mA cm-2 in alkaline electrolyte, comparable to that of IrO2 || Pt/C cell. The present study may pioneer a new avenue for developing the novelly bifunctional electrocatalysts with high-performance and low cost for water splitting.

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Publication details

The article was received on 27 Sep 2019, accepted on 06 Nov 2019 and first published on 07 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01251F
Inorg. Chem. Front., 2019, Accepted Manuscript

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    FexNiy/CeO2 Loaded on N-doped Nanocarbon as an Advanced Bifunctional Electrocatalyst for the Overall Water Splitting

    L. Chen, H. Jang, M. G. Kim, Q. Qin, X. Liu and J. Cho, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI01251F

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