The development of cheap and highly active electrocatalysts
for
efficient water splitting is crucial for the production of green hydrogen
at a low cost. In this work, we proposed a two-step method including
hydrothermal and nitridation reactions to in situ synthesize NiMoN
nanorod arrays with abundant active sites and a fast electron transfer
rate on nickel foam substrate. The optimal tailoring of the Ni/Mo
ratio leads to a high concentration of active Mo3+ species
and suitable Ni doping content in the NiMoN catalyst, which shows
superior hydrogen evolution reaction performance. The overpotentials
at the current densities of 10 and 100 mA/cm2 are only
20 and 46 mV, which are better than those of the most reported NiMoN-based
catalysts and even the commercial benchmark material of Pt/C. Additionally,
the electrocatalyst also shows excellent long-term stability after
24 h tests at densities of 10 and 100 mA/cm2, possessing
great potential for industrial applications for water splitting to
produce hydrogen.
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