Electrochromic and Electrochemical Properties of Co3O4 Nanosheets Prepared by Hydrothermal Method

Abstract

In this paper, Co3O4 nanosheets were prepared by the hydrothermal method. The structure of the material was analyzed by morphological characterization and physical phase analysis, which confirmed the preparation of the product, Co3O4, showing a nanosheet structure. By studying the electrochromic properties of the prepared products, the results show that the transmittance modulation range of the Co3O4 nanosheet is 75% at 780 nm. The coloring response time and bleaching response time is about 3.8 s and 3.4 s, respectively. Electrochemical tests show that the Co3O4 nanosheets have good capacitive properties. Their specific capacitance reaches 1850 F/g when the current density is 1 A/g. When the current density is 5 A/g, the specific capacitance can still maintain 99.6% after 5000 cycles. In addition, Co3O4//CNTs devices can provide a maximum energy density of 79.52 Wh/kg (1 A/g) and a maximum power density of 11,000 W/kg (15 A/g), showing good energy storage capacity. The above data results indicate that the prepared Co3O4 nanosheets can be used as good candidates for supercapacitors. This paper provides a new idea and method for preparing Co3O4 materials.

Polymer template assisted construction of spherical Co3O4@meso-SiO2 yolk-shell nanoreactors for catalytic combustion of volatile organic compounds

“…The non-rectangular shapes of the obtained voltammograms indicate the pseudocapacitive nature of the tested materials [51]. At increasing scan rate, from 25 m V s -1 to 500 m V s -1, the integral areas of CV curves increase and the redox peaks are getting more visible, showing the redox process is a reversible reaction [52]. Only a slight shift towards lower potentials for cathodic peaks and higher potentials for anodic peaks is observed due to increasing polarization and ohmic resistance at higher scan rates.…”

Engineering of Co3O4 electrode via Ni and Cu-doping for supercapacitor application

“…Moreover, in the measurement glassy carbon electrode, Ag/AgCl and Pt were used as a working, reference and counter electrode, respectively (Yadav et al, 2017). Figure 6 The formation of a bigger enclosed area for the supercapacitor's electrodes is crucial for the transfer of charges and improves the specific capacitance values (Geng et al, 2017;Yue et al, 2022). The CV curves of 0.05 M Ni and Cu doped Co 3 O 4 NPs with scan rates of 100 mV/s and a potential window of 0-1.5 V are shown in Figure 6.…”

Surface dynamics and electrochemical examination of Co3O4 films by iron doping

“…Among TMOs, Co 3 O 4 is so attractive with its superior theoretical specific capacitance (3560 F g −1 ) and mixed valence with chemical stability. It is also often used in paramagnetic, solar cells, electrochromic devices and rechargeable batteries [7][8][9]. The nano-and microstructures of the Co 3 O 4 electrodes prepared by different methods have electrochemical performance that varies according to each other.…”