Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors
In the endeavour to increase the energy density and to widen the potential window of aqueous alkaline electrochemical capacitors (EC), this study explores the role of carbon dots (CDs) as an additive in potassium hydroxide electrolyte. The CDs with an average size of ∼2.2 nm and negative surface pot...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English English |
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Elsevier Ltd
2024
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| Online Access: | http://umpir.ump.edu.my/id/eprint/42547/ http://umpir.ump.edu.my/id/eprint/42547/1/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer.pdf http://umpir.ump.edu.my/id/eprint/42547/2/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer%20in%20aqueous%20alkaline%20electrochemical%20capacitors.pdf |
| _version_ | 1848826640436559872 |
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| author | Ganesh, Gayathry Sunil, Vaishak Ling, JinKiong Qamar, Ummiya Izan Izwan, Misnon Kuila, Biplab Kumar Das, Santanu Yang, Chun-Chen Jose, Rajan |
| author_facet | Ganesh, Gayathry Sunil, Vaishak Ling, JinKiong Qamar, Ummiya Izan Izwan, Misnon Kuila, Biplab Kumar Das, Santanu Yang, Chun-Chen Jose, Rajan |
| author_sort | Ganesh, Gayathry |
| building | UMP Institutional Repository |
| collection | Online Access |
| description | In the endeavour to increase the energy density and to widen the potential window of aqueous alkaline electrochemical capacitors (EC), this study explores the role of carbon dots (CDs) as an additive in potassium hydroxide electrolyte. The CDs with an average size of ∼2.2 nm and negative surface potential are synthesized from a dispersion of palm kernel shell powder in water using a low-temperature hydrothermal process. Electrochemical measurements show that the CD–electrolyte ion (K+) interaction has improved counter ion adsorption in porous carbon electrodes via lowering the characteristic resistances and time constants, which significantly improved the fraction of adsorbed charges than diffusively stored. The improved ionic conductivity is attributed to the improved wettability introduced by the hydrophilic functional groups in the CDs. These parametric changes widened the potential window and marked an 80 % increase in the specific energy and over a 10 % increase in specific power in a practical EC with similar mass-loading as commercial devices. The device with CDs demonstrated superior cycling stability and Coulombic efficiency than the control device without them. These findings underscore the potential of CDs as a promising avenue for advancing the performance parameters of aqueous electrolyte EC, aligning with the overarching goal of realising economical, environmentally friendly, and sustainable energy storage solutions. |
| first_indexed | 2025-11-15T03:48:02Z |
| format | Article |
| id | ump-42547 |
| institution | Universiti Malaysia Pahang |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T03:48:02Z |
| publishDate | 2024 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | ump-425472024-09-10T00:29:50Z http://umpir.ump.edu.my/id/eprint/42547/ Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors Ganesh, Gayathry Sunil, Vaishak Ling, JinKiong Qamar, Ummiya Izan Izwan, Misnon Kuila, Biplab Kumar Das, Santanu Yang, Chun-Chen Jose, Rajan HD28 Management. Industrial Management In the endeavour to increase the energy density and to widen the potential window of aqueous alkaline electrochemical capacitors (EC), this study explores the role of carbon dots (CDs) as an additive in potassium hydroxide electrolyte. The CDs with an average size of ∼2.2 nm and negative surface potential are synthesized from a dispersion of palm kernel shell powder in water using a low-temperature hydrothermal process. Electrochemical measurements show that the CD–electrolyte ion (K+) interaction has improved counter ion adsorption in porous carbon electrodes via lowering the characteristic resistances and time constants, which significantly improved the fraction of adsorbed charges than diffusively stored. The improved ionic conductivity is attributed to the improved wettability introduced by the hydrophilic functional groups in the CDs. These parametric changes widened the potential window and marked an 80 % increase in the specific energy and over a 10 % increase in specific power in a practical EC with similar mass-loading as commercial devices. The device with CDs demonstrated superior cycling stability and Coulombic efficiency than the control device without them. These findings underscore the potential of CDs as a promising avenue for advancing the performance parameters of aqueous electrolyte EC, aligning with the overarching goal of realising economical, environmentally friendly, and sustainable energy storage solutions. Elsevier Ltd 2024 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/42547/1/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer.pdf pdf en http://umpir.ump.edu.my/id/eprint/42547/2/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer%20in%20aqueous%20alkaline%20electrochemical%20capacitors.pdf Ganesh, Gayathry and Sunil, Vaishak and Ling, JinKiong and Qamar, Ummiya and Izan Izwan, Misnon and Kuila, Biplab Kumar and Das, Santanu and Yang, Chun-Chen and Jose, Rajan (2024) Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors. Journal of Energy Storage, 94 (112465). pp. 1-10. ISSN 2352-152X. (Published) https://doi.org/10.1016/j.est.2024.112465 10.1016/j.est.2024.112465 |
| spellingShingle | HD28 Management. Industrial Management Ganesh, Gayathry Sunil, Vaishak Ling, JinKiong Qamar, Ummiya Izan Izwan, Misnon Kuila, Biplab Kumar Das, Santanu Yang, Chun-Chen Jose, Rajan Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title | Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title_full | Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title_fullStr | Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title_full_unstemmed | Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title_short | Carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| title_sort | carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors |
| topic | HD28 Management. Industrial Management |
| url | http://umpir.ump.edu.my/id/eprint/42547/ http://umpir.ump.edu.my/id/eprint/42547/ http://umpir.ump.edu.my/id/eprint/42547/ http://umpir.ump.edu.my/id/eprint/42547/1/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer.pdf http://umpir.ump.edu.my/id/eprint/42547/2/Carbon%20dots%20as%20a%20sustainable%20electrolyte%20enhancer%20in%20aqueous%20alkaline%20electrochemical%20capacitors.pdf |