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Multi-Responsive Supercapacitors from Chiral Nematic Cellulose Nanocrystal-Based Activated Carbon Aerogels.
- Source :
-
Small (Weinheim an der Bergstrasse, Germany) [Small] 2023 Aug; Vol. 19 (34), pp. e2301947. Date of Electronic Publication: 2023 Apr 24. - Publication Year :
- 2023
-
Abstract
- The development of long-lived electrochemical energy storage systems based on renewable materials is integral for the transition toward a more sustainable society. Supercapacitors have garnered considerable interest given their impressive cycling performance, low cost, and safety. Here, the first example of a chiral nematic activated carbon aerogel is shown. Specifically, supercapacitor materials are developed based on cellulose, a non-toxic and biodegradable material. The chiral nematic structure of cellulose nanocrystals (CNCs) is harnessed to obtain free-standing hierarchically ordered activated carbon aerogels. To impart multifunctionality, iron- and cobalt-oxide nanoparticles are incorporated within the CNC matrix. The hierarchical structure remains intact even at nanoparticle concentrations of ≈70 wt%. The aerogels are highly porous, with specific surface areas up to 820 m <superscript>2</superscript> g <superscript>-1</superscript> . A maximum magnetization of 17.8 ± 0.1 emu g <superscript>-1</superscript> with superparamagnetic behavior is obtained, providing a base for actuator applications. These materials are employed as symmetric supercapacitors; owing to the concomitant effect of the hierarchically arranged carbon skeleton and KOH activation, a maximum C <subscript>p</subscript> of 294 F g <superscript>-1</superscript> with a capacitance retention of 93% after 2500 cycles at 50 mV s <superscript>-1</superscript> is achieved. The multifunctionality of the composite aerogels opens new possibilities for the use of biomass-derived materials in energy storage and sensing applications.<br /> (© 2023 The Authors. Small published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1613-6829
- Volume :
- 19
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 37093171
- Full Text :
- https://doi.org/10.1002/smll.202301947