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Abstract
As a new class of pseudocapacitive material, metal sulfides possess high electrochemical performance. However, their cycling performance as conventional electrodes is rather poor for practical applications. In this article, we report an original composite electrode based on NiCo2S4@NiO core-shell nanowire arrays (NWAs) with enhanced cycling stability. This three-dimensional electrode also has a high specific capacitance of 12.2 F cm−2 at the current density of 1 mA cm−2 and excellent cycling stability (about 89% retention after 10,000 cycles). Moreover, an all-solid-state asymmetric supercapacitor (ASC) device has been assembled with NiCo2S4@NiO NWAs as the positive electrode and active carbon (AC) as the negative electrode, delivering a high energy density of 30.38 W h kg−1 at 0.288 KW kg−1 and good cycling stability (about 109% retention after 5000 cycles). The results show that NiCo2S4@NiO NWAs are promising for high-performance supercapacitors with stable cycling based on the unique core-shell structure and well-designed combinations.
Highlights
Capacitive materials may be a good way to meet the requirement of high-performance supercapacitors[20,21,22,23,24]
NiO is widely studied for supercapacitors as the positive electrode material due to its high theoretical specific capacitance of 2573 F g−1 within 0.5 V25, good electrochemical stability[26], practical availability, environmentally benign nature and low cost
The results demonstrate that NiCo2S4@NiO NWAs are the kind of promising electrode with enhanced cycling stability for high performance supercapacitor applications
Summary
Capacitive materials may be a good way to meet the requirement of high-performance supercapacitors[20,21,22,23,24]. The results demonstrate that NiCo2S4@NiO NWAs are the kind of promising electrode with enhanced cycling stability for high performance supercapacitor applications.
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