Crystalline and amorphous metal sulfide composite electrode materials with long cycle life:Preparation and performance of hybrid capacitors
Crystalline@amorphous NiCo2S4@MoS2(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realized the defect regulation of crystal NiCo2S4 in the core.Taking advantage of the flexible protection of an amor-phous shell and the high capacity of a conductive core with defects,the v-NCS@MS electrode exhibited high specif-ic capacity(1 034 mAh·g-1 at 1 A·g-1)and outstanding rate capability.Moreover,a hybrid supercapacitor was assembled with v-NCS@MS as cathode and activated carbon(AC)as anode,which can achieve remarkably high specific energy of 111 Wh·kg-1 at a specific power of 219 W·kg-1 and outstanding capacity retention of 80.5％after 15 000 cycling at different current densities.
crystalline@amorphous heterostructureNiCo2S4@MoS2hybrid supercapacitordefect designlong cycle life
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