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One-Step Electro-Precipitation of Nanocellulose Hydrogels on Conducting Substrates and Its Possible Applications: Coatings, Composites, and Energy Devices
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 42019 (English)In: ACS sustainable chemistry & engineering, ISSN 2168-0485, Vol. 7, no 24, p. 19415-19425Article in journal (Refereed) Published
Abstract [en]

TEMPO-oxidized cellulose nanofibrils (TOCN) are pH-responsive biopolymers which undergo sol-gel transition at acidic conditions (pH < 4) due to charge neutralization. Electronically conducting materials can be coated by such gels during aqueous electrolysis, when an electrochemical reaction generates a local pH decrease at the electrode surface. In this work, electro-precipitation of different TOCN gels has been performed on oxygen evolving anodes. We demonstrate that TOCN hydrogels can be electrochemically coated on the surface of any conductive material with even complex 3D shape. Further, not only TOCN but also micro- or nanosized particles containing TOCN composites can be coated on the electrode surface, and coatings containing multiple layers of different composites can be also produced. We demonstrate that this simple and facile electrocoating technique can be subject to various applications, such as coatings making electrodes selective for the hydrogen evolution reaction, as well as a new eco-friendly aqueous-based synthesis of Li-ion battery electrodes.

Place, publisher, year, edition, pages
2019. Vol. 7, no 24, p. 19415-19425
Keywords [en]
Cellulose, TEMPO-oxidized cellulose, Electro-precipitation, pH-responsive hydrogel, Stimuli-responsive hydrogel, Green & Sustainable Science & Technology
National Category
Chemical Sciences Nano Technology
Identifiers
URN: urn:nbn:se:su:diva-177438DOI: 10.1021/acssuschemeng.9b04171ISI: 000503330400011OAI: oai:DiVA.org:su-177438DiVA, id: diva2:1385906
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-15Bibliographically approved

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Kim, HyeyunSalazar-Alvarez, Germán
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