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Facile Synthesis of Carbon Nanosphere/NiCo2O4 Core-shell Sub-microspheres for High Performance Supercapacitor

2015; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/srep12903

2045-2322

Delong Li, Youning Gong, Yupeng Zhang, Chengzhi Luo, Weiping Li, Qiang Fu, Chunxu Pan,

Advanced battery technologies research

Abstract This paper introduced a process to prepare the carbon nanosphere (CNS)/NiCo 2 O 4 core-shell sub-microspheres. That is: 1) CNSs were firstly prepared via a simple hydrothermal method; 2) a layer of NiCo 2 O 4 precursor was coated on the CNS surface; 3) finally the composite was annealed at 350 °C for 2 hours in the air and the CNS/NiCo 2 O 4 core-shell sub-microspheres were obtained. This core-shell sub-microsphere was prepared with a simple, economical and environmental-friendly hydrothermal method and was suitable for large-scale production, which expects a promising electrode candidate for high performance energy storage applications. Electrochemical experiments revealed that the composite exhibited remarkable electrochemical performances with high capacitance and desirable cycle life at high rates, such as: 1) the maximum specific capacitance was up to 1420 F/g at 1 A/g; 2) about 98.5% of the capacitance retained after 3000 charge-discharge cycles; 3) the capacitance retention was about 72% as the current density increase from 1 A/g to 10 A/g.