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Galvanic-replacement Mediated Synthesis of Copper-Nickel Nitrides as Electrocatalyst for Hydrogen Evolution Reaction

Abstract

Electrochemica water splitting is considered to be the one of most promising strategies produce hydrogen to ease the energy crisis. In this paper, we demonstrate a galvanic-replacement mediated synthesis of copper-nickel bimetallic nitrides on partially sacrificial nickel foams (CuxNi4-xN/NF) as the direct catalytic electrode for hydrogen evolution reaction (HER). Ni foam not only serves as the cathodic electrode substrate, but also the only Ni precursor for the CuxNi4-xN catalyst, which could be galvanically replaced by Cu (I) ion. The obtained CuxNi4-xN/NF exhibits excellent electrocatalytic performance towards HER in both acidic and alkaline media, with very low overpotential of ~110 mV at current density of 100 mA cm-2 in 0.5 M H2SO4 and 1 M KOH solution. The electrode presents a good long-term working stability, particularly reflecting in more than 65 h of consistent galvanostatic electrolysis in 0.5 M H2SO4. The CuNi bimetallic nitrides are intrinsically metallic, allowing for enhanced charge transport and excellent electrical conductivity. Combined experimental result and theoretical calculation further reveal that the electrocatalytic active sites are primarily originated from nickel species.

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Publication details

The article was received on 22 Sep 2017, accepted on 06 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08392K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Galvanic-replacement Mediated Synthesis of Copper-Nickel Nitrides as Electrocatalyst for Hydrogen Evolution Reaction

    Y. Ma, Z. D. He, Z. Wu, B. Zhang, Y. Zhang, C. Xiao and S. Ding, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08392K

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