论文简介 |
Abstract
Flexible electrode materials show many advantages and hold great prospects for energy storage
application. But, the synthesis processes of these kind of materials are always complicated, are
low in efficiency and high in cost. Here, we propose a facile and cost-effective two-step synthesis
strategy of a flexible electrode by growing ultrathin and vertical CoNi2S4 nanosheets on
nitrogen-doped carbon foam (CoNi2S4 NSs@NCF). The NCF is obtained by direct carbonization
of the melamine foam. When evaluated as binder-free electrode material for supercapacitor in
three-electrode system, the CoNi2S4 NSs@NCF exhibits an excellent specific capacitance of
1576.8 F g−1 and a superior cycling stability (91.5% capacitance retention at the 5000th cycle).
Then, an asymmetrical supercapacitor was fabricated using the as-synthesized material as the
positive electrode and activated carbon as the negative electrode, which delivers a high energy
density of 42.8 Wh kg−1 at a power density of 399.7Wkg−1, remarkable rate capability and
satisfactory cycling stability (85.3% capacitance retention at the 5000th cycle). In brief, our work
offers a low-cost and facile approach to prepare promising flexible electrode materials for highperformance
supercapacitors.
Keywords: CoNi2S4 nanosheets, nitrogen-doped carbon foam, binder-free, flexible electrode
material, supercapacitors |