Cation substituted Ni3S2 nanosheets wrapped Zn0.76Co0.24S nanowire arrays prepared with in-situ oxidative etching strategy for high performance solid-state asymmetric supercapacitors

•An interface bridging connection is constructed between the Zn0.76Co0.24S and Zn.Co-doped Ni3S2 by in-situ oxidative etching ni foam to provide ni source and followed sulfidation process to form sulfides.•The obtained ZCS@ZCNS-2 electrode exhibits the high capacitance of 6.4 f cm−2 at 2 mA cm−1, with high-rate capability of 64% due to the structural features.•The possible structure and composition evolution mechanisms were presented.