Abstract
The sluggish kinetics of oxygen evolution reaction (OER) hampers the conversion of renewable energies into hydrogen through an electrocatalytic process. Then, the hydrazine oxidation reaction (HzOR) is a promising anodic reaction to substitute OER, which can decrease the water-splitting voltage. Herein, self-supported ruthenium-doped cuprous oxide nanochains were synthesized on commercial copper foam (Ru-Cu2O/CF). The Ru-Cu2O/CF provides superior hydrogen evolution reaction (HER) and HzOR performances owing to its specific morphology, superhydrophilic surface, porous support and Ru doping. When used in alkaline or neutral electrolytes, the Ru-Cu2O/CF is capable of driving 10 mA cm−2 only at 31 and 51 mV, respectively. In HzOR, it is possible to achieve a superlow potential of − 41 mV at 10 mA cm−2. In an electrolytic cell with a Ru-Cu2O/CF both as cathode and anode, a voltage of 17.4 mV is needed to reach 10 mA cm−2, which is powered by renewable energies.
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