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. 2023 Sep 6;13(38):26744-26754.
doi: 10.1039/d3ra04478e. eCollection 2023 Sep 4.

High-performance hybrid supercapacitor-immobilized Wells-Dawson polyoxometalates on activated carbon electrodes

Madhusree J E  1 , Pranay R Chandewar  2 , Debaprasad Shee  2 , Sib Sankar Mal  1
Affiliations

High-performance hybrid supercapacitor-immobilized Wells-Dawson polyoxometalates on activated carbon electrodes

Madhusree J E et al. RSC Adv. .

Abstract

The nanofabrication of electroactive hybrid materials for next-generation energy storage devices is becoming increasingly significant as supercapacitor (SC) technology develops rapidly. The present study utilizes activated carbon (AC) templates reinforced with Wells-Dawson polyoxotungstates (POMs) to produce nanohybrid electrodes for high-performance supercapacitors. This study analyzes Wells-Dawson polyoxotungstates (P2W18) for the first time integrated with AC, and its structural and electrochemical performances are discussed. First, the electrochemical performances of symmetric supercapacitors were characterized in an acidic aqueous electrolyte (0.5 M H2SO4). It was observed that a supercapacitor cell containing the 5 wt% AC-P2W18 hybrid symmetric displayed a noteworthy specific capacitance of 289 F g-1 and a remarkable energy density of 40 W h kg-1. Moreover, 5% AC-P2W18 symmetric supercapacitor cells showed 89% cyclic stability over 4000 cycles. Three LED lights were charged onto the electrode. The LEDs continued to illuminate continuously for red until 160 seconds, yellow until 20 seconds, and blue until 10 seconds after removing the electrode from the electrochemical workstation, demonstrating the device's power and energy density.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1. FTIR spectra of pure P2W18, 5%, 10%, and 15% of AC-P2W18.
Fig. 2
Fig. 2. XRD patterns of pure P2W18, 5%, 10%, and 15% of AC-P2W18.
Fig. 3
Fig. 3. XPS spectra of AC-P2W18 (a) C 1s, (b) O 1s, (c) W 4f, and (d) P 2p.
Fig. 4
Fig. 4. (a) N2 adsorption and desorption isotherms of AC and AC-P2W18, (b) pore size distribution of AC and AC-P2W18.
Fig. 5
Fig. 5. (a) FESEM image of pure P2W18, (b) 5% AC-P2W18.
Fig. 6
Fig. 6. Cyclic voltammetry graphs (a) 5% AC-P2W18, (b) 10% AC-P2W18, (c) 15% AC-P2W18, and (d) comparison graph of all three symmetric SC cells.
Fig. 7
Fig. 7. GCD graphs of (a) 5% AC-P2W18, (b) 10% AC-P2W18, and (c) 15% AC-P2W18, (d) specific capacitance vs. current density for 5%, 10%, and 15% of AC-P2W18, (e) Ragone plot for all three nanohybrids and (f) comparison graph for all three symmetric SC cells.
Fig. 8
Fig. 8. (a) Nyquist plot and cyclic stability of (b) 5% AC-P2W18, (c) 10% AC-P2W18, and (d) 15% AC-P2W18.
Fig. 9
Fig. 9. LED images of blue light using 5% AC-P2W18 as the electrode material.
See this image and copyright information in PMC

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