Boosting electrochemical nitrite-ammonia conversion properties by a Cu foam@Cu2O catalyst

Electrocatalytic reduction of nitrite (NO2-) to ammonia (NH3) can simultaneously achieve wastewater treatment and ammonia production, but it needs efficient catalysts. Herein, Cu2O particles self-supported on Cu foam with enriched oxygen vacancies are developed to enable selective NO2- reduction to NH3, exhibiting a maximum NH3 yield rate of 7510.73 mu g h(-1) cm(-2) and high faradaic efficiency of 94.21% at -0.6 V in 0.1 M PBS containing 0.1 M NaNO2. Density functional theory calculations reveal the vital role of oxygen vacancies during the nitrite reduction process, as well as the reaction mechanisms and the potential limiting step involved. This work provides a new avenue to the rational design of Cu-based catalysts for NH3 electrosynthesis.

Automated summary

In this study, Cu2O particles self-supported on Cu foam with enriched oxygen vacancies were developed as efficient catalysts for selective reduction of nitrite to ammonia. The catalyst exhibited a high NH3 yield rate and Faradaic efficiency under experimental conditions, providing a new approach for rational design of Cu-based catalysts for NH3 electrosynthesis.