Journal
ELECTROCHIMICA ACTA
Volume 250, Issue -, Pages 167-173Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.08.047
Keywords
Metal-organic frameworks; Ni0.67Co0.33Se2/C; Hydrogen evolution reaction (HER); Oxygen evolution reaction (OER); Water-splitting electrocatalysis
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Funding
- National Natural Science Foundation of China [51372212]
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In this work, we demonstrate that the electrocatalytic activity of transition metal chalcogenides can be greatly enhanced by simultaneously engineering the active sites, surface area, and conductivity. Using metal-organic frameworks-derived (Ni,Co)Se-2/C hollow rhombic dodecahedra (HRD) as a demonstration, we show that the incorporation of Ni into CoSe2 could generates additional active sites, the hierarchical hollow structure promotes the electrolyte diffusion, the in-situ hybridization with C improves the conductivity. As a result, the (Ni,Co)Se-2/C HRD exhibit superior performance toward the overall water-splitting electrocatalysis in 1 M KOH with a cell voltage as low as 1.58 V at the current density of 10 mA cm(-2), making the (Ni,Co)Se-2/C HRD as a promising alternative to noble metal catalysts for water splitting. (C) 2017 Elsevier Ltd. All rights reserved.
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