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Phase-pure Pentlandite Ni4.3Co4.7S8 Binary Sulfide as Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Hydrogen Evolution

Abstract

Developing an efficient non-noble bifunctional electrocatalyst for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in same electrolyte is significant to lower the cost for electrochemical water splitting. Herein, a phase-pure pentlandite Ni4.3Co4.7S8 bifunctional electrocatalyst was synthesized via a hydrothermal process using commercial nickel foam as nickel source. Active metallic nickel source and chelating agent ethylenediamine play important roles in the formation of phase-pure pentlandite Ni4.3Co4.7S8 binary sulfide. Physicochemical characterizations, electrochemical measurements and density functional theory (DFT) computations illustrate that the exposed high indexed (022) surface with biomimetic hydrogenase-like structure, the metallic characteristics of pentlandite phase with next-neighbor metal-metal bonds, as well as the synergistic effect between Ni and Co ions in the high overlap of density of state (DOS) on Fermi-level, the elevation of d-state center (from -2.84 to -1.52 eV) and the high occupation of anti-bonding eg ( and ) d-orbitals, endow the Ni4.3Co4.7S8 bifunctional electrocatalyst higher catalytic activity for OER than RuO2, comparative activity for HER to commercial Pt/C and low over-potential for all water splitting in alkaline electrolyte. The studies here provide a novel strategy to synthesis phase-pure pentlandite nickel cobalt binary sulfides and boost their applications in electrochemical water splitting.

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Publication details

The article was received on 23 Mar 2018, accepted on 15 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8NR02402B
Citation: Nanoscale, 2018, Accepted Manuscript
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    Phase-pure Pentlandite Ni4.3Co4.7S8 Binary Sulfide as Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Hydrogen Evolution

    Y. Tang, H. Yang, J. Sun, M. Xia, W. Guo, L. Yu, J. Yan, J. Zheng, L. Chang and F. Gao, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02402B

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