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Sheet-like NiCo-layered double hydroxide anchored on N self-doped hierarchical porous carbon aerogel from chitosan for high-performance supercapacitors

2022; Elsevier BV; Volume: 921; Linguagem: Inglês

10.1016/j.jallcom.2022.166036

1873-4669

Kai Zhao, Xiaolin Sun, Zihao Wang, Chuanfeng Huang, Da Li, Jingquan Liu,

Advanced battery technologies research

Smart use of renewable and biodegradable biomass materials to partially replace other synthetic materials can bring huge economic benefit and environmental improvement. Herein, a highly graphitized N self-doped hierarchical porous carbon aerogel (HPCA) conductive frame is prepared using biomass chitosan particle as the precursor. Subsequently, nickel-cobalt layered double hydroxide (NiCo-LDH) nanosheets with desired pseudocapacitance properties are uniformly anchored on HPCA. Generally, a porous carbon skeleton with high conductivity and a large surface area brings a lot of active sites and channels for rapid electron and ion transport, and can control the growth morphology of NiCo-LDH nanosheets. As a result, compared with NiCo-LDH/HPCA-10, NiCo-LDH/HPCA-50 and pure NiCo-LDH, the optimized NiCo-LDH/HPCA-30 composite exhibits a large specific capacitance (1504 F g −1 at 1 A g −1 ) and excellent capacitance retention rate (85.9% after 5000 cycles) in a three-electrode system. In addition, the assembled NiCo-LDH/HPCA-30//AC asymmetric supercapacitor can bring a high energy density (33.33 Wh kg −1 ) and an outstanding cycle retention rate (90.76% after 3000 cycles). Therefore, the new NiCo-LDH/HPCA-30 composite with excellent electrochemical properties is expected to give full play to the application advantages of high-performance energy storage devices. The composite material of NiCo-LDH ultra-thin nanosheets uniformly grown on highly graphitized N self-doped HPCA conductive substrate shows outstanding electrochemical storage performance. • Chitosan (Cs) is biomass material which is biodegradable, resource-rich and low-cost. • HPCA has a high specific surface area and can control the even dispersion and growth of NiCo-LDH nanosheets. • The NiCo-LDH/HPCA-30 electrode shows excellent supercapacitor characteristics.