Low-nitrite generation Cu–Co/Ti cathode materials for electrochemical nitrate reduction

Recent Progress and Perspectives on Transition Metal-Based Electrocatalysts for Efficient Nitrate Reduction

“…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.…”

“…Currently, many types of carrier materials are used for electrocatalytic nitrate reduction, including catalyst carrier materials such as oxides, nickel foams, copper foams, and carbon materials, which play an important role in promoting and improving electrocatalytic performance. Oxide carriers (such as titanium oxides − ,, ) are widely used as catalyst carriers because of their desirable properties, such as large surface area, high porosity, and chemical stability. In addition, the abundance of hydroxyl groups on the surface of oxide carriers can influence the loading of metals on the carriers through interactions with metal precursors .…”

Selective Nitrate Electroreduction to Ammonia on CNT Electrodes with Controllable Interfacial Wettability

“…A variety of advanced electrocatalysts using either noble metals (e.g., Pt, Ru, and Pd) − or transition metals (e.g., Cu, Fe, Co, and Ni) − have demonstrated considerable activity for the NO 3 RR. In this regard, a majority of the related studies investigated the electrocatalysts in terms of their interfacial geometry and electronic structure.…”

Enhancing electro-reduction of nitrite to ammonia by loading Co3O4on CuO to construct elecrocatalytic dual-sites

“…Besides, although numerous research studies have showed that Cu-Co oxide composites offered excellent activity towards NARA, there are little discussions about the reaction intermediates. 15,16,[21][22][23][24] Among several explanations for the enhanced activity in NARA on the Cu-Co composite, 14,[17][18][19][20] the dual-site mechanism proposed by He et al may be more suitable for the composite structure, where the nitrite ion was found to be the reduction intermediate. 14 However, our preliminary works showed that the Cu-Co-O system also provided excellent electro-catalytic performance for NIRA, which lack nitrate ions.…”

“…Recently, some researchers have noticed that copper and cobalt oxide composites (Cu-Co-O) could offer excellent electro-catalytic activity for nitrate reduction to ammonia (NARA). [14][15][16][17][18][19][20] He et al first proposed a dual-site catalytic mechanism of Cu-Co oxide and hydroxides for the electrocatalytic NARA reaction. 14 However, the rather complex synthetic procedure of CuCoSP may have hindered the thorough understanding of the dual-site catalytic mechanism.…”