Transition metal compounds are attractive for their significant applications in supercapacitors and as non-noble metal catalysts for electrochemical water splitting. Herein, we develop Ni_3S_2 nanorods growing directly on Ni foam, which act as multifunctional additive-free Ni_3S_2@Ni electrode for supercapacitor and overall water splitting. Based on PVA-KOH gel electrolyte, the assembled all-solid-state Ni_3S_2@Ni//AC asymmetric supercapacitor delivers a high areal energy density of 0.52 mWh cm~(–2) at an areal power density of 9.02 mW cm~(–2...
