University of Oulu

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), 59.

Sustainable supercapacitors based on polypyrrole-doped activated biochar from wood waste electrodes

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Author: Lima, Ravi Moreno Araujo Pinheiro1; dos Reis, Glaydson Simões2; Lassi, Ulla3,4;
Organizations: 1Institute of Materials Science, Federal University of Sao Francisco Valley, Juazeiro 48902-300, Bahia, Brazil
2Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, Biomass Technology Centre, SE-90183 Umeå, Sweden
3Research Unit of Sustainable Chemistry, University of Oulu, FI-90014 Oulu, Finland
4Unit of Applied Chemistry, University of Jyvaskyla, Kokkola University Consortium Chydenius, Talonpojankatu 2B, FI-67100 Kokkola, Finland
5Institute of Chemistry, Federal University of Rio Grande do Sul–UFRGS, Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre 91501-970, RS, Brazil
6Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria 97105–900, RS, Brazil
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.2 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2023
Publish Date: 2023-06-13


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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Series: C. Journal of carbon research
ISSN: 2311-5629
ISSN-E: 2311-5629
ISSN-L: 2311-5629
Volume: 9
Issue: 2
Article number: 59
DOI: 10.3390/c9020059
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
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 information: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (