“…Due to the natural abundance and better physicochemical properties, nanomaterials containing nickel element have attracted much interest in recent years, such as Ni [23], NiO [24,25], Ni(OH) 2 [26,27], NiF 2 [28], Ni 2 P [29], etc. Among them, Ni 2 P nanoparticles have been synthesized via high-temperature reduction at 500 C with NiS 2 as the precursor and investigated the corresponding electrochemical properties [30].…”