Projects per year
Abstract
One of the key challenges in the development of energy storage devices relates to material sourcing in harmony with clean technologies. Herein, cellulose nanocrystals (CNC) extracted from brewery residues are used as transparent hydrogel electrolyte after physical cross-linking with aluminum ions (Al3+). The hydrogel electrolyte (Al-CNC) exhibits an ultrahigh ionic conductivity (∼24.9 mS cm−1), high optical transmittance (∼92.9% at 550 nm wavelength), outstanding compression strength (3.9 MPa at a 70% strain), and tolerates to various deformations (e.g., twisting, folding, rolling). Meanwhile, animal bone biowaste is used to synthesize porous carbon (PC) electrodes (∼879 m2 g−1) that are effective in delivering an outstanding specific capacitance (∼804 F g−1 at 1 A g−1). A fully renewable flexible symmetric supercapacitor is assembled by sandwiching the Al-CNC hydrogel between two bone-derived PC electrodes (PC//Al-CNC//PC). The obtained flexible device displays a high energy density (18.2 Wh kg−1 at 1 425 W kg−1), exceptional power density (20 833 W kg−1 at 7.1 Wh kg−1), and ∼92% capacitance retention after 6 000 cycles at 5 A g−1. We further demonstrated the biowaste-derived high-performance flexible supercapacitors for their mechanical durability and reliable electrochemical performance under bending cycles. All combined, the devices are shown to be ideally suited for renewable energy storage applications.
Original language | English |
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Article number | 135058 |
Number of pages | 11 |
Journal | Chemical Engineering Journal |
Volume | 435 |
Issue number | 3 |
Early online date | 10 Feb 2022 |
DOIs | |
Publication status | Published - 1 May 2022 |
MoE publication type | A1 Journal article-refereed |
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H-Cel: Gas-driven technology for cost-efficient production of cellulose nanocrystals
Kontturi, E., Kähkönen, O. & Pääkkönen, T.
01/01/2021 → 31/12/2022
Project: Business Finland: New business from research ideas (TUTLI)
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BioELCell: Bioproducts Engineered from Lignocelluloses: from plants and upcycling to next generation materials
Majoinen, J., Rojas Gaona, O., Dufau Mattos, B., Klockars, K., Abidnejad, R., Garcia Greca, L., Bhattarai, M., Ajdary, R., Johansson, L., Zhu, Y., Zhao, B., Ressouche, E., Tardy, B., Robertson, D., Kämäräinen, T. & Reyes Torres, G.
30/07/2018 → 31/07/2023
Project: EU: ERC grants
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CERES: Competence Center for the materials Bioeconomy: A Flagship for our Sustainable Future
01/05/2018 → 31/12/2022
Project: Academy of Finland: Other research funding