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Hollow Ni–V–Mo Chalcogenide Nanopetals as Bifunctional Electrocatalyst for Overall Water Splitting
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posted on 2018-12-04, 00:00 authored by Huafeng Fan, Jun Huang, Guangliang Chen, Wei Chen, Rui Zhang, Sijun Chu, Xingquan Wang, Chaorong Li, Kostya Ken OstrikovRational
design of noble-metal-free electrocatalysts with excellent
performance for both hydrogen evolution reaction (HER) and oxygen
evolution reaction (OER) is critical for next-generation industrial
applications of water electrolysis. Here, a simple and robust preparation
method of three-dimensional (3D) nanostructured catalysts made of
abundant metals is presented. The 3D hydrangea-like microspheres made
of nickel–vanadium double hydroxide nanosheets are first prepared
on the Ni–Co foam (NCF) followed by the hydroxides exchange
with (MoS4)2– ions to form Chevrel-phase
Ni–V–Mo sulfide. Benefiting from the 3D holey nanostructures
with a large surface area, low adsorption free energy values, and
fast electronic transport, the overpotentials of the optimized Ni8V2(Mo3S4)11/NCF
catalyst for HER and OER at a current density 10 mA cm–2 are as low as 129 and 330 mV, respectively. The amounts of H2 and O2 generated at a current density of 10 mA
cm–2 are about 517 and 342 μmol h–1, which is very competitive with most advanced research results reported
for non-noble-metal electrodes in alkaline medium. The Chevrel-phase
chalcogenide also features excellent long-term stability under prolonged
HER and OER cycling conditions. Our results suggest that Chevrel-phase
materials are promising as low-cost and efficient bifunctional electrocatalysts
for overall water splitting in alkaline electrolytes.
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Keywords
surface areaChevrel-phase materialsdensitynanostructured catalystshydroxide nanosheetsenergy valueshydrogen evolution reactionMoS 4water electrolysisChevrel-phase chalcogenide3 D hydrangea-like microspheresnon-noble-metal electrodesH 2cmoxygen evolution reactionOER cycling conditionsnoble-metal-free electrocatalystshydroxides exchangeBifunctional ElectrocatalystO 2optimized Ni 8 V 2mAHERMo 3 S 4330 mV3 D holey nanostructurespreparation methodWater Splitting Rational designresearch resultswater splittingbifunctional electrocatalystsNCF