“…In Figure b, the lattice fringes of 0.205 and 0.253 nm can be observed, corresponding to the XRD results of Ni 3 Fe(111) and FeV 2 O 4 (311), respectively. There is an obvious interface between Ni 3 Fe and FeV 2 O 4 due to the different enthalpies of Ni, Fe, and V to form the heterojunction, which could result in the rearrangement of electrons at the interface, forming electron-rich and electron-poor species, attracting H + /H 2 O and OH – adsorption energy, and thus promoting the activity. , This special structure could effectually fabricate enough defects provide abundant active sites, reduce electron/ion transmission distance, and facilitate bubble desorption. The energy dispersive spectroscopy (EDS) mappings reveal the uniform distribution of Fe, Ni, V, C, and O elements on the surface of nanosheets (Figure f–j).…”