期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 12, 页码 13267-13278出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c02792
关键词
graphene; cobalt selenide; hollow nanostructure; nanocomposite; supercapacitor
资金
- Natural Science Foundation of Hebei Province [B2019402082, F2020402010, E2021402004]
- Science and Technology Project of Hebei Education Department [QN2020214, ZD2018213]
- Hebei Talent Project Training Funds [A201803003]
The study presents a feasible approach to engineer hollow cobalt selenide-graphene nanocomposites with enhanced electrochemical performance for supercapacitors. The synthesized hollow CoSe2@rGO nanocomposites demonstrate high specific capacity, excellent cyclic stability, and great potential for practical applications in asymmetric supercapacitor cells.
Transition-metal selenides (TMSs) as electrode materials for super-capacitors (SCs) are suffering from low rate capacities and poor cyclic stability due to their easy aggregation and structural instability over charge/discharge cycles. Herein, reduced graphene oxide (rGO) nanosheet-wrapped hollow cobalt selenide (CoSe2) nanocubes are synthesized using a sacrificial-template method combined with a selenization treatment. In such nanocomposites, hollow CoSe2 nanocubes with porous shells are featured by abundant electroactive sites, easy ion diffusion, and enough buffering space. More importantly, the wrapping of rGO nanosheets around hollow CoSe2 nanocubes not only endows the nanocomposites with higher electrical conductivity but also restrains the aggregation of hollow CoSe2 nanocubes as well as maintains the structural stability during cycles. Consequently, the synthesized hollow CoSe2@rGO nanocomposites demonstrate a specific capacity of up to 856 C g(-1) at 2 A g(-1), 76% capacity retention at 20 A g(-1), and 95% capacity retention over 5000 cycles at 10 A g(-1). Moreover, an asymmetric supercapacitor cell with hollow CoSe2@rGO nanocomposites as the positive electrode achieves an energy density of 53.0 W h kg(-1) at a power density of 800 W kg(-1), suggesting a great potential for their practical applications. This work showcases a feasible approach to engineer hollow TMS-graphene nanocomposites as electrode materials for SCs.
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