AUTHOR=Zhang Weike , Peng Lin , Wang Jiawei , Guo Chunli , Chan Siew Hwa , Zhang Lan 

TITLE=High Electrochemical Performance of Bi2WO6/Carbon Nano-Onion Composites as Electrode Materials for Pseudocapacitors

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00577

DOI=10.3389/fchem.2020.00577

ISSN=2296-2646

ABSTRACT=<p>Bi<sub>2</sub>WO<sub>6</sub>/CNO (CNO, carbon nano-onion) composites are synthesized via a facile low-cost hydrothermal method and are used pseudocapacitor electrode material. X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N<sub>2</sub> adsorption-desorption techniques, and X-ray photoelectron spectroscopy (XPS) measurements are used to characterize the synthesized composite powders. The electrochemical performances of the composite electrodes are studied by cycle voltammetry, charge-discharge, and electrochemical impedance spectroscopy. The results indicate that the specific capacitance of the Bi<sub>2</sub>WO<sub>6</sub>/CNO composite materials reaches up to 640.2 F/g at a current density of 3 mA/cm<sup>2</sup> and higher than that of pristine Bi<sub>2</sub>WO<sub>6</sub>, 359.1 F/g. The capability of the prepared pseudocapacitor remains 90.15% after 1,000 cycles of charge-discharge cycling measurement. The cell performance and stability can be enhanced by further optimization and modification of the composition and microstructure of the electrode of the cell.</p>