Abstract
Bi2WO6/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), N2 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 Bi2WO6/CNO composite materials reaches up to 640.2 F/g at a current density of 3 mA/cm2 and higher than that of pristine Bi2WO6, 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.
Highlights
According to the BP Statistical Review of World Energy 2018, renewable power hit a new high of 3.6% in that year
The crystalline phases of BWO and Carbon nano-onions (CNOs) were detected in the prepared composite materials, which means the BWO/6CNOs had been successfully synthesized by this low-cost hydrothermal method and that the phase formation of BWO had not been affected by CNOs
The microstructure and chemical composition were studied by SEM, transmission electron microscopy (TEM), BET, and X-ray photoelectron spectroscopy (XPS) measurements, and the results show heterojunction formation between BWO and CNOs
Summary
According to the BP Statistical Review of World Energy 2018, renewable power (solar, wind, tide, etc.) hit a new high of 3.6% in that year. Compared with EDLC, pseudocapacitors using metal oxide as the electrode, which could obtain higher specific capacitance, have attracted more attention. Pech et al (2010) proved that, compared with CNT and carbon black, CNOs have low electrical resistance because of the open-surface system, which contributed to the migration of ions (Tian et al, 2020). Overall, these characteristics of CNOs are favorable for electrochemical application. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) measurements were used to investigate the electrochemical performance of samples
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