Abstract
A simple and economical synthetic route for direct one-step growth of bimetallic Ni2Mo3N nanoparticles on Ni foam substrate (Ni2Mo3N/NF) and its catalytic performance during an oxygen evolution reaction (OER) are reported. The Ni2Mo3N/NF catalyst was obtained by annealing a mixture of a Mo precursor, Ni foam, and urea at 600 °C under N2 flow using one-pot synthesis. Moreover, the Ni2Mo3N/NF exhibited high OER activity with low overpotential values (336.38 mV at 50 mA cm−2 and 392.49 mV at 100 mA cm−2) and good stability for 5 h in Fe-purified alkaline electrolyte. The Ni2Mo3N nanoparticle surfaces converted into amorphous surface oxide species during the OER, which might be attributed to the OER activity.
Highlights
Hydrogen (H2 ) is a promising energy carrier due to its high mass-specific energy density (142 MJ kg−1 ), high utilization efficiency, and zero carbon emission when generated from renewable energy sources
The Ni2 Mo3 N nanoparticle surfaces converted into amorphous surface oxide species during the oxygen evolution reaction (OER), which might be attributed to the OER activity
Water splitting consists of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER)
Summary
Hydrogen (H2 ) is a promising energy carrier due to its high mass-specific energy density (142 MJ kg−1 ), high utilization efficiency, and zero carbon emission when generated from renewable energy sources. Electrochemical water splitting from renewables such as solar or wind energy is considered a clean and efficient route for hydrogen production [1,2,3,4]. 4e− ) are kinetically sluggish relative to the two electrons involved in HER, requiring large overpotential values [5,6,7,8,9]. Ir- and Ru-based materials are typical catalysts for OER, but their high cost and scarcity restrict their widespread application [10,11,12]. Developing alternative OER electrocatalysts based on low-cost and abundant materials is urgent for the large-scale proliferation of water-splitting systems
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