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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...

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Main Authors: Ganesh, Gayathry, Sunil, Vaishak, Ling, JinKiong, Qamar, Ummiya, Izan Izwan, Misnon, Kuila, Biplab Kumar, Das, Santanu, Yang, Chun-Chen, Jose, Rajan
Format: Article
Language:English
English
Published: Elsevier Ltd 2024
Subjects:
HD28 Management. Industrial Management
Online Access: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
http://umpir.ump.edu.my/id/eprint/42547/
https://doi.org/10.1016/j.est.2024.112465
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spelling my.ump.umpir.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
institution Universiti Malaysia Pahang Al-Sultan Abdullah
building UMPSA Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang Al-Sultan Abdullah
content_source UMPSA Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
English
topic HD28 Management. Industrial Management
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
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.
format Article
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
title 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_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_sort carbon dots as a sustainable electrolyte enhancer in aqueous alkaline electrochemical capacitors
publisher Elsevier Ltd
publishDate 2024
url 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
http://umpir.ump.edu.my/id/eprint/42547/
https://doi.org/10.1016/j.est.2024.112465
_version_ 1822924657735499776
score 13.235362

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