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Research on growth and supercapacitance of NiCo based electrode materials regulated by halogen ions
Received date: 2021-11-17
Online published: 2022-08-11
Supercapacitors are potential electrochemical energy storage devices whose performance depends on electrode materials.The morphology，phase and chemical composition of NiCo-bsaed supercapacitor electrode materials could be easily controlled by hydrothermal method by changing the kinds of added halogen ions（F-，Cl-，Br-）.The results of X-ray diffraction（XRD） and scanning electron microscopy（SEM） showed that nanosheet?support?nanowire arrays with a stable NiCo LDH structure were synthesized by the induce of F-，nanowires and the main ingredient Co2（CO3）（OH）2·H2O were synthesized by the induce of Cl- or Br-.The electrochemical results indicated that the morphology and crystal shape had significant influence on electrochemical performance.The performance was optimal at Cl- doping and reaction at 120 ℃ for 3 h，under this condition，the morphology was nanowires，and the crystal form changed into amorphous structure.The best sample not only exhibited a maximum specific capacitance of 2 940 mF/cm2 at 2 mA/cm2，but also the devices assembled with the electrode and cathode activated carbon had a voltage window of 1.8 V and exhibited an excellent cycling stability.
Tiantian JIANG , Xuetang XU , Fan WANG . Research on growth and supercapacitance of NiCo based electrode materials regulated by halogen ions[J]. Inorganic Chemicals Industry, 2022 , 54(8) : 66 -73 . DOI: 10.19964/j.issn.1006-4990.2021-0695
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