Sheet-like NiCo-layered double hydroxide anchored on N self-doped hierarchical porous carbon aerogel from chitosan for high-performance supercapacitors
Journal of Alloys and Compounds(2022)
摘要
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.
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关键词
Layered double hydroxide,Chitosan,Hierarchical porous carbon aerogels,Nitrogen self-doping,Asymmetric supercapacitors
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