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Study on high-performance supercapacitors based on Fe2O3/biomass carbon composites
Received date: 2021-05-31
Online published: 2022-03-18
To improve the low specific capacitance of carbon materials as well as the poor electrical conductivity and low cyclic stability of ferric oxide(Fe2O3),Fe2O3 was used to modify the surface of biomass-derived carbon to prepare Fe2O3/bio-mass carbon composites,which achieved higher specific capacitance and better stability by the synergistic effect of Fe2O3 and biomass-derived carbon.The samples were characterized by scanning electron microscopy(SEM)、X-ray photoelectron spec-troscopy(XPS) and Raman spectra.The results demonstrated that the prepared composites had a certain pore struc-ture,with Fe2O3 nanoparticles anchored on the carbon surface.When the mass ratio of Fe2O3 and biomass-derived carbon was 1:1,the prepared composites possessed the best electrochemical performance,showing a high specific capacitance of 430.8 F/g(1.0 A/g) in 3.0 mol/L KOH.The capacitance retention was still greater than 60% when the current density was increased by 20 times.The asymmetric supercapacitor constructed by using it as the negative electrode had a high voltage window(0~1.6 V) and achieved a high energy density of 39.1 W·h/kg.While,it also exhibited excellent cycling stability with 111% capacitance retention after 5 000 cycles at 10 A/g.
Key words: biomass; Fe2O3; composite materials; specific capacitance; supercapacitor
Dian WANG , Qiong SU , Shaofeng PANG , Shijun CAO , Lihui KANG , Lichun LIANG , Yanbin WANG , Zhaoxia LI . Study on high-performance supercapacitors based on Fe2O3/biomass carbon composites[J]. Inorganic Chemicals Industry, 2022 , 54(3) : 59 -65 . DOI: 10.19964/j.issn.1006-4990.2021-0352
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