Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes

Abstract
The synthesis of high-performance carbon-based materials from biomass residues for electrodes has been considered a challenge to achieve in supercapacitor-based production. In this work, activated biochar has been prepared as the active electrode material for supercapacitors (SCs), and an effective method has been explored to boost its capacitive performance by employing polypyrrole (PPy) as a biochar dopant. The results for physicochemical characterization data have demonstrated that PPy doping affects the biochar morphology, specific surface area, pore structure, and incorporation of surface functionalities on modified biochar. Biochar-PPy exhibited a surface area of 87 m2 g−1, while pristine biochar exhibited 1052 m2 g−1. The SCs were assembled employing two electrodes sandwiched with PVA solid-state film electrolyte as a separator. The device was characterized by standard electrochemical assays that indicated an improvement of 34% in areal capacitance. The wood electrodes delivered high areal capacitances of 282 and 370 mF cm−2 at 5 mA cm−2, for pure biochar and biochar doped with PPy, respectively, with typical retention in the capacitive response of 72% at the end of 1000 cycles of operation of the supercapacitor at high current density, indicating that biochar-PPy-based electrode devices exhibited a higher energy density when compared to pure biochar devices.
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Format
Articles Research article
Published
2023
Series
Subjects
Publication in research information system
Publisher
MDPI AG
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202306073571Use this for linking
Review status
Peer reviewed
ISSN
2311-5629
DOI
https://doi.org/10.3390/c9020059
Language
English
Published in
C.
Citation
  • Lima, R. M. A. P., dos Reis, G. S., Lassi, U., Lima, E. C., Dotto, G. L., & de Oliveira, H. P. (2023). Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes. C., 9(2), Article 59. https://doi.org/10.3390/c9020059
License
CC BY 4.0Open Access
Additional information about funding
Dr. dos Reis thanks Bio4Energy—a Strategic Research Environment appointed by the Swedish government and the Swedish University of Agricultural Sciences (SLU), for the funding support. This research was also funded by CAPES, FACEPE, FAPESB, and CNPq.
Copyright© 2023 by the authors. Licensee MDPI, Basel, Switzerland.

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author Lima, Ravi Moreno Araujo Pinheiro dos Reis, Glaydson Simões Lassi, Ulla Lima, Eder Claudio Dotto, Guilherme Luiz de Oliveira, Helinando Pequeno
author_facet Lima, Ravi Moreno Araujo Pinheiro dos Reis, Glaydson Simões Lassi, Ulla Lima, Eder Claudio Dotto, Guilherme Luiz de Oliveira, Helinando Pequeno
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description The synthesis of high-performance carbon-based materials from biomass residues for electrodes has been considered a challenge to achieve in supercapacitor-based production. In this work, activated biochar has been prepared as the active electrode material for supercapacitors (SCs), and an effective method has been explored to boost its capacitive performance by employing polypyrrole (PPy) as a biochar dopant. The results for physicochemical characterization data have demonstrated that PPy doping affects the biochar morphology, specific surface area, pore structure, and incorporation of surface functionalities on modified biochar. Biochar-PPy exhibited a surface area of 87 m2 g−1, while pristine biochar exhibited 1052 m2 g−1. The SCs were assembled employing two electrodes sandwiched with PVA solid-state film electrolyte as a separator. The device was characterized by standard electrochemical assays that indicated an improvement of 34% in areal capacitance. The wood electrodes delivered high areal capacitances of 282 and 370 mF cm−2 at 5 mA cm−2, for pure biochar and biochar doped with PPy, respectively, with typical retention in the capacitive response of 72% at the end of 1000 cycles of operation of the supercapacitor at high current density, indicating that biochar-PPy-based electrode devices exhibited a higher energy density when compared to pure biochar devices.
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spellingShingle Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes Lima, Ravi Moreno Araujo Pinheiro dos Reis, Glaydson Simões Lassi, Ulla Lima, Eder Claudio Dotto, Guilherme Luiz de Oliveira, Helinando Pequeno wood waste wood electrodes wood-based supercapacitors polypyrrole pseudocapacitance puu (luonnonmateriaalit) biohiili puuhiili superkondensaattorit elektrodit jätteet C.
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title Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes
title_full Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes
title_fullStr Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes
title_full_unstemmed Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes
title_short Sustainable Supercapacitors Based on Polypyrrole-Doped Activated Biochar from Wood Waste Electrodes
title_sort Sustainable Supercapacitors Based on PolypyrroleDoped Activated Biochar from Wood Waste Electrodes
topic wood waste wood electrodes wood-based supercapacitors polypyrrole pseudocapacitance puu (luonnonmateriaalit) biohiili puuhiili superkondensaattorit elektrodit jätteet
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