One-step O2 plasma synthesis of oxygen-vacancy-rich Cu2O on Cu foam for enhanced nitrate-to-ammonia electroreduction.

Cu2O electrodes are well documented for outstanding performance in the NO3RR. However, rational construction of high-performance Cu2O electrodes remains challenging. We propose a one-step O2-plasma to make vacancy-rich Cu2O within 20 min, achieving 91.5% NH3 FE with a yield of 6.6 mg h-1 cm-2 and 12 h stability for green fast electrode synthesis.