Pal, Bhupender and Sarkar, Kalyan Jyoti and Wu, Bing and Děkanovský, Lukáš and Mazánek, Vlastimil and Rajan, Jose and Sofer, Zdeněk (2023) Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes. ACS Omega, 8 (2). pp. 2629-2638. ISSN 2470-1343. (Published)
|
Pdf
Explorationof Charge Storage Behavior of Binder-Free EDLCapacitors in Aqueous Electrolytes.pdf Available under License Creative Commons Attribution. Download (7MB) | Preview |
Abstract
Charge storage in electrochemical double-layer capacitors (EDLCs) is via the adsorption of electrolyte counterions in their positive and negative electrodes under an applied potential. This study investigates the EDLC-type charge storage in carbon nanotubes (CNT) electrodes in aqueous acidic (NaHSO4), basic (NaOH), and neutral (Na2SO4) electrolytes of similar cations but different anions as well as similar anions but different cations (Na2SO4 and Li2SO4) in a two-electrode Swagelok-type cell configuration. The physicochemical properties of ions, such as mobility/diffusion and solvation, are correlated with the charge storage parameters. The neutral electrolytes offer superior charge storage over the acidic and basic counterparts. Among the studied ions, SO42– and Li+ showed the most significant capacitance owing to their larger solvated ion size. The charge stored by the anions and cations follows the order SO42– > HSO4– > OH– and Li+ > Na+, respectively. Consequently, the CNT//Li2SO4//CNT cell displayed outstanding charge storage indicators (operating voltage ∼0–2 V, specific capacitance ∼122 F·g–1, specific energy ∼67 W h·kg–1, and specific power ∼541 W·kg–1 at 0.5 A·g–1) than the other cells, which could light a red light-emitting diode (2.1 V) for several minutes. Besides, the CNT//Li2SO4//CNT device showed exceptional rate performance with a capacitance retention of ∼95% at various current densities (0.5–2.5 A·g–1) after 6500 cycles. The insights from this work could be used to design safer electrochemical capacitors of high energy density and power density.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Binder-Free, EDL Capacitors, Aqueous Electrolytes, Electrochemical energy storage |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor T Technology > T Technology (General) T Technology > TP Chemical technology |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Miss Amelia Binti Hasan |
| Date Deposited: | 24 Oct 2023 00:38 |
| Last Modified: | 24 Oct 2023 00:38 |
| URI: | http://umpir.ump.edu.my/id/eprint/38986 |
| Download Statistic: | View Download Statistics |
Actions (login required)
 |
View Item |