The electrochemical reduction of nitrate (NO3RR) has become an emerging technique to simultaneously remove nitrate from polluted water and produce valuable products like ammonia. Recently, there has been a growing interest in creating Cu-based metal-organic framework (MOF) and covalent-organic framework (COF) electrocatalysts for the NO3RR because of their attractive properties such as high activity, porosity, and large surface area. This review will summarize and evaluate the recent developments of Cu-MOF/COF electrocatalysts for the NO3RR to ammonia and discuss the future perspectives of the field. The ammonia selectivity of monometallic Cu-MOFs/COFs has remained inferior to other reported monometallic MOFs/COFs. However, strategies to enhance their electrocatalytic performance such as by incorporating electron-withdrawing groups, bimetallic units, or Cu clusters have demonstrated promising results, establishing the basis for future NO3RR research.
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