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Cobalt Molybdenum Oxide Derived High-Performance Electrocatalyst for the Hydrogen Evolution Reaction
The design and synthesis
of high-performance hydrogen evolution
reaction (HER) catalysts requires an overall consideration of intrinsic
activity and number of active sites as well as electric conductivity.
We herein report a facile synthesis of a cost-effective catalyst that
can simultaneously address these key issues. A cobalt molybdenum oxide
hydrate (CoMoO<sub>4</sub>·<i>n</i>H<sub>2</sub>O)
with a 3D hierarchical nanostructure can be readily grown on nickel
foam using a hydrothermal method. Calcination treatment of this precursor
material under a reductive atmosphere resulted in the formation of
Co nanoparticles on the Co<sub>2</sub>Mo<sub>3</sub>O<sub>8</sub> surface,
which worked in concert to act as active sites for the HER. In addition,
the resulting Co<sub>2</sub>Mo<sub>3</sub>O<sub>8</sub> from the dehydration
and reduction reactions of CoMoO<sub>4</sub>·<i>n</i>H<sub>2</sub>O showed remarkable increases in both active surface
area and electrical conductivity. As a consequence of these favorable
attributes, the catalyst exhibited electrocatalytic performance comparable
to that of the commercial Pt/C catalyst for the HER in alkaline solution,
which is promising for practical water-splitting applications