“…Taking these considerations into mind, tremendous efforts have been devoted to the effective modulation of MOFs to improve their electrocatalytic activity, such as metal doping, heterostructure construction, morphology design, defect engineering, and hybridization of conductive functional materials. 18–20 Among these methods, heteroatom doping is an effective strategy to enhance the electrochemical properties of catalysts since the doped elements can adjust the electronic structure and increase the number of active sites. 21–24 For example, Sun et al synthesized NiFeV hydroxide nanosheet arrays directly grown on Ni foam.…”