Robust electrocatalytic nitrate-to-N 2 conversion enabled by an engineered Bi 2 O 3 –Cu 2 O heterojunction on Cu foam under high-salinity and wide-pH conditions

The Bi 2 O 3 –Cu 2 O heterojunction on Cu foam (Bi–Cu@CF) demonstrates a reduction–oxidation process for robust electrocatalytic nitrate removal to N 2 in high-salt wastewater.