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Asymmetric Electrodes with Transition Metal Disulfides Heterostructure and Amorphous Bimetallic Hydroxide for Effective Alkaline Water Electrolysis

Abstract

Idiographic asymmetric electrodes (Ni3S2/MoS2-CC and NiFe(OH)x@Ni3S2/MoS2-CC) with transition metal disulfides (TMDs) heterostructure and amorphous bimetallic hydroxide are prepared for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by hydrothermal method, electrodeposition, and in-situ growth strategy. Synthesized electrodes demonstrate first-rate performances with enhanced durability for electrolysis. Individually, Ni3S2/MoS2-CC affords the overpotential (η) of 173 mV (at 100 mA cm-2) in HER, and NiFe(OH)x@Ni3S2/MoS2-CC affords η of 309 mV (at 100 mA cm-2) in OER. Tight interstratification between nanosheets (NSs) array and amorphous bimetallic hydroxide lead to enhanced affinity for OH−/H+, improved conductivity and charge transfer, and richer active sites. Two-electrode alkaline (1.0 M KOH) electrolyzer (NMC//NFNMC) requires a low overall voltage (ΔV) of 1.55 and 1.71 V to reach 10 and 100 mA cm-2. Rational combination of TMDs and TMDs/NiFe(OH)x delivers useful methodology for designing and constructing low-cost hierarchical transition-metal-based composite catalysts with high performance for water electrolysis.

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Publication details

The article was received on 31 Oct 2018, accepted on 02 Jan 2019 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA10458A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Asymmetric Electrodes with Transition Metal Disulfides Heterostructure and Amorphous Bimetallic Hydroxide for Effective Alkaline Water Electrolysis

    X. H. Wang, Y. Ling, B. L. Li, X. L. Li, G. Chen, B. X. Tao, L. Li, N. Li and H. Q. Luo, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA10458A

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