Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 880, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114899
Keywords
Hydrothermal carbonization; Biomass waste; Phosphoric acid; Nitrogen doping; Activated carbon; Supercapacitor
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Funding
- MICINN, FEDER [RTI2018095291-B-I00]
- Generalitat Valenciana [GRISOLIA/2018/105]
- MICINN [IJCI-2016-27636]
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This study employed H3PO4-assisted hydrothermal carbonization to prepare activated carbons from hemp residues, demonstrating high porosity development and energy density through nitrogen group functionalization and heat treatment.
Biomass upgrading is a promising approach to face the current energy consumption and chemicals production. Lignocellulosic biomass residues have taken the lead in this field. In this study, hemp residue-based activated carbons (ACs) were prepared by H3PO4-assisted hydrothermal carbonization (HTC) using a low concentration of H3PO4 (25 wt%). ACs with a high porosity development were obtained (SBET > 1200 m2 g?1), and they were subsequently functionalized with nitrogen groups using mild conditions. As-synthesized ACs were also heat-treated to enhance the electrical conductivity, improving the electrochemical performance. As a proof of concept, electrochemical capacitors (ECs) based on as-prepared ACs in aqueous and organic electrolytes, showing energy densities comparable to those of a capacitor based on an AC used in commercial capacitors. The most attractive outcome of this study is the straightforward, cost-effective, and sustainable methodology to prepare high added-value functional ACs with great potential for energy and environmental applications.
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