Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

Shear exfoliated few-layer graphene and cellulose nanocrystal composite as biocompatible anode with efficient charge transfer




Julkaisun tekijät: Lund Sara, Björnvik Elisabeth, Wang Qingbo, Wang Xiaoju, Vajravel Sindhujaa, Wey Laura T., Allahverdiyeva Yagut, Kauppila Jussi, Smått Jan-Henrik, Peltonen Jouko, Latonen Rose-Marie, Lindfors Tom

Kustantaja: Elsevier Ltd

Julkaisuvuosi: 2022

Journal: Carbon Trends

Tietokannassa oleva lehden nimi: Carbon Trends

Volyymi: 9

ISSN: 2667-0569

DOI: http://dx.doi.org/10.1016/j.cartre.2022.100210

Verkko-osoite: https://www.sciencedirect.com/science/article/pii/S2667056922000669?via%3Dihub

Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/176522998


Tiivistelmä

Electroconductive composites of graphene and cellulose nanocrystals (CNC) were prepared by direct exfoliation of natural flake graphite in CNC suspensions. Using the scalable high-shear exfoliation method, we show that the environmentally friendly CNC is an excellent graphene stabilizer as we prepared aqueous graphene-CNC dispersions with a high concentration (4.0 mg ml−1) and yield (4.0%) after only 2 h exfoliation time. With this fast and facile method, we exfoliated graphite using CNC with different amounts of negatively charged sulfate ester groups. We found that the graphene concentration is proportional to zeta potential of the CNC suspension suggesting that electrostatic repulsion plays a key role in graphene stabilization. Albeit the insulating nature of CNC, the spray-coated composite films were electrically conductive with conductivity up to 280 S m−1, depending on the CNC amount. Cyclic voltammetry measurements showed a reversible redox response for the Fe(CN)63-/4− couple proving that the electron transfer was efficient in the composite film. Furthermore, biocompatibility studies with photosynthetic microorganisms revealed no toxic effects as the cells maintained their photosynthetic performance and growth when placed in direct contact with the composite. The cytocompatibility, electroactivity and good water-stability make the composite film a promising anode for bioelectrochemical applications.


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Last updated on 2022-05-10 at 10:30