Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (1): 20210556.doi: 10.7503/cjcu20210556

• Article • Previous Articles     Next Articles

Synthesis and Supercapacitor Properties of Biimidazole-modified {SiW12O40} Hybrid

LIANG Yu, LIU Huan, GONG Lige, WANG Chunxiao, WANG Chunmei, YU Kai, ZHOU Baibin()   

  1. Key Laboratory of Photonic and Electronic Bandgap Materials,Ministry of Education,School of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China
  • Received:2021-08-08 Online:2022-01-10 Published:2021-10-30
  • Contact: ZHOU Baibin E-mail:zhou_bai_bin@163.com
  • Supported by:
    the National Natural Science Foundation of China(21571044);the Central Government’s Plan to Support the Talent Training Project of the Reform and Development Fund of Local Universities, China(1401120002);the Natural Science Foundation of Heilongjiang Province of China(ZD2021B002);the Excellent Scientific Research Team Project of Harbin Normal University, China(XKYT2020001)

Abstract:

H4SiW12O40 was used as a precursor to synthesize biimidazole-modified supramolecular hybrid under hydrothermal condition, and its chemical formula was determined to be [Co(bim)2(H2O)2][H2SiW12O40]·2H2O(1)(bim=biimidazole) by elemental composition and thermal gravity(TG) analysis. Single-crystal diffraction analysis shows that, the compound is composed of [H2SiW12O402?, [Co(bim)2(H2O)22+ and two H2O. At the same time, the components form 1D to 3D structures through hydrogen bond and supramolecular interaction. Using glassy carbon, carbon cloth and nickel foam as the current collectors, when the current density is 1 A/g, in the three-electrode system, compound 1 shows the specific capacitance(350.09, 107.02 and 186.83 F/g), better than most literature reports, and with capacitance retention of 94.5%, 92.8% and 95.1% after 5000 cycles. The kinetic analysis shows that the charge storage mechanism of the compound is dominated by surface-controlled electric charges. And simulataneously in the foamed nickel two-electrode system, the compound shows the specific capacitance 80.00 F/g at 1 A/g current density, an energy density of 9.41 W·h/kg for a power density of 130.83 W/kg in a voltage window of 0.75 V, and an outstanding cycle stability with 92.4% capacitance retention after 5000 cycles. It is shown that the synthetic hybrid is a better candidate material for supercapacitor electrodes.

Key words: Polyoxometalate, [SiW12O404?, Hydrothermal synthesis, Supercapacitor performance

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