Nanoflower-like metallic conductive MoO2 as a high-performance non-precious metal electrocatalyst for the hydrogen evolution reaction†
Searching for non-precious metal electrocatalysts with high activity and stability for the hydrogen evolution reaction (HER) has attracted considerable attention. Herein, we report the synthesis of nanoflower-like MoO2 on nickel foam (NFL MoO2/NF). Remarkably, as a HER electrocatalyst operating in alkaline electrolytes, NFL MoO2/NF exhibits high stability and activity. The onset potential of NFL MoO2/NF is almost 0 V versus the reversible hydrogen electrode (RHE) and bubbles can be produced on the surface of NFL MoO2/NF under a static overpotential of only 10 mV, comparable to commercial Pt/C. NFL MoO2/NF needs overpotentials of only about 55 and 80 mV to achieve current densities of 10 and 20 mA cm−2, respectively. NFL MoO2/NF has superior stability in the long-term electrochemical process and retains 94.3 percent of its initial current density after 25 hours.