The performance of Zn2+doped sulfide/hydroxide heterogeneous structure
In order to improve the rate capability and cycling stability of sulfides,a two-step electrodeposition method is used to prepare transition metal sulfide/hydroxide heterogeneous structure composite electrodes.A nickel layer is electrodeposited on the carbon cloth to improve the contact activity between the active substance and the carbon cloth.Zn(NO3)2·7H2O is added to thioacetamide to prepare the Zn2+doped transition metal sulfide/hydroxide heterogeneous structure(NCS-Zn-2).The specific capacitance of NCS-Zn-2 reaches 2 703 F/g at a current of 1 A/g,and the specific capacitance at a high current of 150 A/g is 40.8%of that at 1 A/g,showing good rate capability.A high voltage aqueous asymmetric supercapacitor assembled with NCS-Zn-2 and activated carbon with an operating voltage of 1.6 V has a specific energy of 79.9 W·h/kg at a specific power of 794 W/kg,the capacitance retention rate is 98.7%after 20 000 cycles in 0-1.6 V and a current of 20 A/g.
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