Abstract

Cuprous oxide on copper foil electrodes prepared via electrochemical deposition and thermal annealing are investigated towards CO2 electrochemical reduction at low overpotential. The thickness of the electrochemical deposited Cu2O was controlled by varying the constant-current deposition time. The surface morphology and roughness were examined with SEM and CV respectively. The electrode fabricated by cuprous oxide deposited for 20 min demonstrated the best faradic efficiency (7.02%) and specific activity (0.123 mA/cm2) towards format/formic acid formation at -0.5 V vs. RHE in CO2 saturated 0.5 M K2CO3 among studied samples.

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