卤离子调控的镍钴基电极材料生长及电容影响研究

doi:10.19964/j.issn.1006-4990.2021-0695

Abstract

Abstract:

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.

Key words: morphology, halogen ions regulation, hydrothermal treatment, NiCo-based, supercapacitor

CLC Number:

TQ138.1

JIANG Tiantian,XU Xuetang,WANG Fan. Research on growth and supercapacitance of NiCo based electrode materials regulated by halogen ions[J]. Inorganic Chemicals Industry, 2022, 54(8): 66-73.

Figures/Tables 8

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Table 1

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Research on growth and supercapacitance of NiCo based electrode materials regulated by halogen ions

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