Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors

Chirag Mevada; Aapo Kattainen; Vijay Singh Parihar; Amit Tewari; Jari Keskinen; Matti Mäntysalo

doi:10.1109/FLEPS65444.2025.11105683

Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

3 Citations (Scopus)

7 Downloads (Pure)

Abstract

Employing indigo to functionalize commercial activated carbon (CAC) for screen-printed electrodes represents an innovative approach to enhance the electrochemical characteristics of CAC, making it suitable for applications in supercapacitors (SCs). The indigofunctionalized activated carbon (IAC) electrode material was successfully synthesized through a solvothermal method. Various material characterization techniques, such as X-ray diffraction, thermogravimetric analysis, BET surface area analysis and Raman spectroscopy confirmed the successful functionalization of indigo onto the CAC. Screen-printed SCs fabricated with aqueous electrolyte exhibit a specific capacitance of 32.7Fg⁻¹ at a current density of 0.5Ag⁻¹ which is higher than the CAC (10.8Fg⁻¹). This work presents a promising pathway for developing printed, sustainable, and non-toxic SCs for low power wireless sensors and IoT devices.

Original language	English
Title of host publication	FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings
Publisher	IEEE
Number of pages	4
ISBN (Electronic)	979-8-3315-0999-6
ISBN (Print)	979-8-3315-1000-8
DOIs	https://doi.org/10.1109/FLEPS65444.2025.11105683
Publication status	Published - 2025
Publication type	A4 Article in conference proceedings
Event	IEEE International Conference on Flexible and Printable Sensors and Systems - , Singapore Duration: 22 Jun 2025 → 25 Jun 2025

Publication series

Name	IEEE International Conference on Flexible and Printable Sensors and Systems
ISSN (Print)	2832-8248
ISSN (Electronic)	2832-8256

Conference

Conference	IEEE International Conference on Flexible and Printable Sensors and Systems
Country/Territory	Singapore
Period	22/06/25 → 25/06/25

Publication forum classification

Publication forum level 1

Access to Document

10.1109/FLEPS65444.2025.11105683

Indigo-Functionalized ActivatedAccepted author manuscript, 3.57 MBLicence: CC BY

https://urn.fi/URN:NBN:fi:tuni-202508148247Licence: CC BY

Laboratory for Future Electronics – LFE
Mäntysalo, M. (Contact), Majumdar, S. (Contact), Berger, P. (Contact), Lupo, D. (Contact) & Keskinen, J. (Contact)
Electrical Engineering
Facility/equipment: Research infrastructure
Tampere Microscopy Center
Vippola, M. (Manager), Honkanen, M. (Operator) & Salminen, T. (Operator)
Faculty of Engineering and Natural Sciences
Facility/equipment: Research infrastructure

Cite this

Mevada, C., Kattainen, A., Parihar, V. S., Tewari, A., Keskinen, J., & Mäntysalo, M. (2025). Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors. In FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings (IEEE International Conference on Flexible and Printable Sensors and Systems). IEEE. https://doi.org/10.1109/FLEPS65444.2025.11105683

@inproceedings{403686b8980f491a894bf2addd4aac1b,

title = "Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors",

abstract = "Employing indigo to functionalize commercial activated carbon (CAC) for screen-printed electrodes represents an innovative approach to enhance the electrochemical characteristics of CAC, making it suitable for applications in supercapacitors (SCs). The indigofunctionalized activated carbon (IAC) electrode material was successfully synthesized through a solvothermal method. Various material characterization techniques, such as X-ray diffraction, thermogravimetric analysis, BET surface area analysis and Raman spectroscopy confirmed the successful functionalization of indigo onto the CAC. Screen-printed SCs fabricated with aqueous electrolyte exhibit a specific capacitance of 32.7Fg−1 at a current density of 0.5Ag−1 which is higher than the CAC (10.8Fg−1). This work presents a promising pathway for developing printed, sustainable, and non-toxic SCs for low power wireless sensors and IoT devices.",

author = "Chirag Mevada and Aapo Kattainen and Parihar, \{Vijay Singh\} and Amit Tewari and Jari Keskinen and Matti M{\"a}ntysalo",

year = "2025",

doi = "10.1109/FLEPS65444.2025.11105683",

language = "English",

isbn = "979-8-3315-1000-8",

series = "IEEE International Conference on Flexible and Printable Sensors and Systems",

publisher = "IEEE",

booktitle = "FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings",

address = "United States",

note = "IEEE International Conference on Flexible and Printable Sensors and Systems ; Conference date: 22-06-2025 Through 25-06-2025",

}

Mevada, C , Kattainen, A , Parihar, VS , Tewari, A , Keskinen, J & Mäntysalo, M 2025, Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors. in FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings. IEEE International Conference on Flexible and Printable Sensors and Systems, IEEE, IEEE International Conference on Flexible and Printable Sensors and Systems, Singapore, 22/06/25. https://doi.org/10.1109/FLEPS65444.2025.11105683

Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors. / Mevada, Chirag ; Kattainen, Aapo ; Parihar, Vijay Singh et al.
FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings. IEEE, 2025. (IEEE International Conference on Flexible and Printable Sensors and Systems).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors

AU - Mevada, Chirag

AU - Kattainen, Aapo

AU - Parihar, Vijay Singh

AU - Tewari, Amit

AU - Keskinen, Jari

AU - Mäntysalo, Matti

PY - 2025

Y1 - 2025

N2 - Employing indigo to functionalize commercial activated carbon (CAC) for screen-printed electrodes represents an innovative approach to enhance the electrochemical characteristics of CAC, making it suitable for applications in supercapacitors (SCs). The indigofunctionalized activated carbon (IAC) electrode material was successfully synthesized through a solvothermal method. Various material characterization techniques, such as X-ray diffraction, thermogravimetric analysis, BET surface area analysis and Raman spectroscopy confirmed the successful functionalization of indigo onto the CAC. Screen-printed SCs fabricated with aqueous electrolyte exhibit a specific capacitance of 32.7Fg−1 at a current density of 0.5Ag−1 which is higher than the CAC (10.8Fg−1). This work presents a promising pathway for developing printed, sustainable, and non-toxic SCs for low power wireless sensors and IoT devices.

AB - Employing indigo to functionalize commercial activated carbon (CAC) for screen-printed electrodes represents an innovative approach to enhance the electrochemical characteristics of CAC, making it suitable for applications in supercapacitors (SCs). The indigofunctionalized activated carbon (IAC) electrode material was successfully synthesized through a solvothermal method. Various material characterization techniques, such as X-ray diffraction, thermogravimetric analysis, BET surface area analysis and Raman spectroscopy confirmed the successful functionalization of indigo onto the CAC. Screen-printed SCs fabricated with aqueous electrolyte exhibit a specific capacitance of 32.7Fg−1 at a current density of 0.5Ag−1 which is higher than the CAC (10.8Fg−1). This work presents a promising pathway for developing printed, sustainable, and non-toxic SCs for low power wireless sensors and IoT devices.

U2 - 10.1109/FLEPS65444.2025.11105683

DO - 10.1109/FLEPS65444.2025.11105683

M3 - Conference contribution

SN - 979-8-3315-1000-8

T3 - IEEE International Conference on Flexible and Printable Sensors and Systems

BT - FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings

PB - IEEE

T2 - IEEE International Conference on Flexible and Printable Sensors and Systems

Y2 - 22 June 2025 through 25 June 2025

ER -

Mevada C , Kattainen A , Parihar VS , Tewari A , Keskinen J , Mäntysalo M. Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors. In FLEPS 2025 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings. IEEE. 2025. (IEEE International Conference on Flexible and Printable Sensors and Systems). doi: 10.1109/FLEPS65444.2025.11105683

Indigo-Functionalized Activated Carbon Electrode for Screen-Printed Eco-Friendly Supercapacitors

Abstract

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Equipment

Laboratory for Future Electronics – LFE

Tampere Microscopy Center

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