High-performance aqueous asymmetric supercapacitors based on the cathode of one-step electrodeposited cracked bark-shaped nickel manganese sulfides on activated carbon cloth

In this work,we report a high-performance self-standing supercapacitor electrode of mixed nickel manganese sulfides (NMSs)with a cracked-bark shape grown by one-step electrochemical deposition on activated carbon cloth (ACC).The electrode possesses outstanding electrochemical properties,including a high specific capacitance of up to 3142.8 F gat 1.0 A g,the high-rate performance (～1206.8 F gat 60.0 A g),and cycle stability (～92.3%capacitance retention after 8000 cycles at8 A g).An asymmetric supercapacitor assembled using NMSs on ACC as the cathode,activated carbon on carbon cloth as the anode and 1.0 mol LKOH as the electrolyte delivers a high energy density of 111.2 W h kgat 800.0 W kgand the prominent cycling performance of～93.2%capacitance retention after 10000 cycles at 5 A gwith the Columbic efficiency of around 100%during these 10000 cycles.The high performance and facile preparation indicate that the NMSs on ACC hold a huge potential as the electrode for supercapacitors.