“…Moreover, this heterogeneous structure remained stable after 10 cycles. Therefore, the study of bimetallic oxides is the focus of the current research on metal oxides, such as Cu-Co oxides, 78,113,114,119,123 Cu-Ni oxides, 124 Fe-Ni oxides, 42,125 and Co-Mn oxides, 126 whose excellent catalytic performance in electrochemical nitrate reduction is not only due to the excellent catalytic performance of the transition metals themselves but also because of the role of the heterojunction. The Ni 0.8 Cu 0.2 O@CuO@NF composites prepared by Hu et al 124 In addition, the oxygen vacancies (O v s) in metal oxides can achieve faster electron transfer 127 and stronger adsorption of oxygen atoms in nitrate, whereas O v s provide electrons for nitrogen in nitrate to promote adsorption and activation, thereby enhancing the catalytic performance.…”