Ni3S2/Co3S4 with controlled surface electron arrangement for high-performance aqueous energy storage

Ni 3 S 2 /Co 3 S 4 -Sv is prepared as an electrode material of Ni–Zn battery and supercapacitors. It displays lowered OH − adsorption energy and high DOS value due to combined effect of the heterostructure and sulfur vacancies as reflected from DFT results.