Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes
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...
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| Format: | Article |
| Language: | English |
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American Chemical Society
2023
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| Online Access: | http://umpir.ump.edu.my/id/eprint/38986/ http://umpir.ump.edu.my/id/eprint/38986/1/Explorationof%20Charge%20Storage%20Behavior%20of%20Binder-Free%20EDLCapacitors%20in%20Aqueous%20Electrolytes.pdf |
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| author | Pal, Bhupender Sarkar, Kalyan Jyoti Wu, Bing Děkanovský, Lukáš Mazánek, Vlastimil Rajan, Jose Sofer, Zdeněk |
| author_facet | Pal, Bhupender Sarkar, Kalyan Jyoti Wu, Bing Děkanovský, Lukáš Mazánek, Vlastimil Rajan, Jose Sofer, Zdeněk |
| author_sort | Pal, Bhupender |
| building | UMP Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T03:32:19Z |
| format | Article |
| id | ump-38986 |
| institution | Universiti Malaysia Pahang |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T03:32:19Z |
| publishDate | 2023 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | ump-389862023-10-24T00:38:14Z http://umpir.ump.edu.my/id/eprint/38986/ Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes Pal, Bhupender Sarkar, Kalyan Jyoti Wu, Bing Děkanovský, Lukáš Mazánek, Vlastimil Rajan, Jose Sofer, Zdeněk HD Industries. Land use. Labor T Technology (General) TP Chemical technology 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. American Chemical Society 2023 Article PeerReviewed pdf en cc_by_4 http://umpir.ump.edu.my/id/eprint/38986/1/Explorationof%20Charge%20Storage%20Behavior%20of%20Binder-Free%20EDLCapacitors%20in%20Aqueous%20Electrolytes.pdf 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) https://doi.org/10.1021/acsomega.2c07143 10.1021/acsomega.2c07143 |
| spellingShingle | HD Industries. Land use. Labor T Technology (General) TP Chemical technology Pal, Bhupender Sarkar, Kalyan Jyoti Wu, Bing Děkanovský, Lukáš Mazánek, Vlastimil Rajan, Jose Sofer, Zdeněk Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title | Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title_full | Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title_fullStr | Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title_full_unstemmed | Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title_short | Exploration of Charge Storage Behavior of Binder-Free EDL Capacitors in Aqueous Electrolytes |
| title_sort | exploration of charge storage behavior of binder-free edl capacitors in aqueous electrolytes |
| topic | HD Industries. Land use. Labor T Technology (General) TP Chemical technology |
| url | http://umpir.ump.edu.my/id/eprint/38986/ http://umpir.ump.edu.my/id/eprint/38986/ http://umpir.ump.edu.my/id/eprint/38986/ http://umpir.ump.edu.my/id/eprint/38986/1/Explorationof%20Charge%20Storage%20Behavior%20of%20Binder-Free%20EDLCapacitors%20in%20Aqueous%20Electrolytes.pdf |