Abstract
Mesoporous C@FexSy composite as a negative electrode for supercapacitors was synthesized via a one-step hydrothermal treatment followed by an electrodeposition process and its electrochemical properties were studied. Compared with bare carbon sphere, the electrochemical performance of C@FexSy composite was significantly improved, with a high specific capacitance (267.45 F/g), good rate performance (201.08 F/g at 2.5 A/g), and superior cycling stability (almost no capacitance degradation after 1000 cycles). The results show that the obtained C@FexSy composite is a promising negative electrode material for supercapacitors
Highlights
Supercapacitors have attracted tremendous attention in recent years owing to their high power density, short charging time, and good stability [1,2,3]
The electrical performance of C@FexSy was investigated, and the results indicated that the C@FexSy composite exhibited a significantly improved electrochemical performance than bare Carbon spheres (CS)
These CSs exhibit smooth surfaces and they are connected with each other. This provides high volumetric specific surface area and good mass transport property, which are useful for supercapacitor application
Summary
Supercapacitors have attracted tremendous attention in recent years owing to their high power density, short charging time, and good stability [1,2,3]. Carbonaceous materials exhibit limited double-layer capacitance, which limits further development of high energy density supercapacitors [4,5]. The electrical performance of C@FexSy was investigated, and the results indicated that the C@FexSy composite exhibited a significantly improved electrochemical performance than bare CS.
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