Facile autoreduction synthesis of core-shell Bi-Bi2O3/CNT with 3-dimensional neural network structure for high-rate performance supercapacitor

doi:10.1016/j.jmst.2020.02.007

Abstract

Abstract:

Core-shell Bi-Bi₂O₃/CNT (carbon nanotube) with 3-dimensional neural network structure where Bi-Bi₂O₃ nanospheres act as cell bodies supported by a 3-dimensional network of CNTs acting as synapses is designed and prepared by simple solvothermal method and subsequent annealing autoreduction treatment, and this structure facilitates the efficient transport of electrons. It can provide two electron transfer paths due to the double contact of Bi₂O₃ shell with CNT and metal Bi core which enhances the efficiency of the electrochemical reaction. The Bi-Bi₂O₃/CNT electrode shows a high gravimetric capacitance of 850 F g^-1 (1 A g^-1), and the specific capacitance of Bi-Bi₂O₃/CNT can be still 714 F g^-1 at 30 A g^-1 indicating excellent rate performance. The asymmetric supercapacitor is assembled with Bi-Bi₂O₃/CNT as the negative electrode and Ni(OH)₂/CNT as the positive electrode, delivering a high energy density of 36.7 Wh kg^-1 and a maximum power density of 8000 W kg^-1. Therefore, the core-shell Bi-Bi₂O₃/CNT with 3-dimensional neural network structure as the negative electrode of supercapacitor shows great potential in the field of energy storage in the future.

Key words: Electrochemical energy-storage, Asymmetric supercapacitor, 3-Dimensional neural network structure, Core-shell structure, Bismuth oxide, Bismuth metal, Carbon nanotube

Han Wu, Jingdong Guo, De’an Yang. Facile autoreduction synthesis of core-shell Bi-Bi₂O₃/CNT with 3-dimensional neural network structure for high-rate performance supercapacitor[J]. J. Mater. Sci. Technol., 2020, 47: 169-176.

Figures/Tables 6

Fig. 1. The schematic diagram of synthesis process.

Fig. 2. SEM images of (a) pure Bi2O3, (b) Bi2O3/CNT and (c, d) Bi-Bi2O3/CNT. (e) TEM images of Bi-Bi2O3/CNT. (f) HRTEM images (inset: SAED pattern) of Bi-Bi2O3/CNT. (g) HAADF-STEM image and corresponding elemental mapping images of Bi, C, and O of Bi-Bi2O3/CNT.

Fig. 3. (a) XRD patterns of CNT, Bi2O3, Bi2O3/CNT, and Bi-Bi2O3/CNT. (b) Nitrogen adsorption-desorption isotherms, (c) Pore-size distribution plots of Bi2O3, Bi2O3/CNT, Bi-Bi2O3/CNT. (d) XPS Survey spectrum of Bi-Bi2O3/CNT. (e) Bi 4f and (f) O 1s spectrum of Bi-Bi2O3/CNT.

Fig. 4. (a, b, c) CV curves of Bi2O3, Bi2O3/CNT, Bi-Bi2O3/CNT at different rates. (d, e, f) GCD curves of Bi2O3, Bi2O3/CNT, Bi-Bi2O3/CNT at various current density.

Fig. 5. (a) SC valve of Bi2O3, Bi2O3/CNT, Bi-Bi2O3/CNT at various current density. (b) EIS of Bi2O3/CNT, Bi-Bi2O3/CNT. (c) Scheme illustrating the benefits of core-shell Bi-Bi2O3/CNT neural network nanostructure.

Fig. 6. (a) Comparison CV curves of Bi-Bi2O3/CNT electrode and Ni(OH)2/CNT electrode at a scan rate of 20 mV/s. (b) CV curves at different scan rates (10-200 mV/s). (c) GCD curves at different current densities. (d) Specific Capcitance at different current densities. (e) Cycle performance of ASC device(inset: photograph of the ignited LED from Bi-Bi2O3/CNT//Ni(OH)2/CNT ASC device). (f) Ragone plots of the Bi-Bi2O3/CNT//Ni(OH)2/CNT ASC device. The values reported for other ASCs are added for comparison.

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Facile autoreduction synthesis of core-shell Bi-Bi₂O₃/CNT with 3-dimensional neural network structure for high-rate performance supercapacitor

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