Oral presentation

9.Invited – Supramolecular structure of isolated cellulose I according to CP/MAS 13C-NMR

Tomas Larsson

Adjunct professor

KTH Royal Institute of Technology / WWSC

Supercapacitors employing electrochemical double layer capacitance (EDLC) for charge storage require electrode materials with high specific surface areas and narrow, nanoscale pore size distributions.[1,2] Activated carbons, which are cost-effective to produce and have the necessary surface area and pore geometries, are often used for this purpose.[2] Abundant biopolymers such as cellulose are interesting sources for activated carbon as their nanocrystalline forms can act as lyotropic liquid crystals in aqueous suspension, self-assembling into chiral nematic phases.[3] This helical structure can be maintained in aerogel materials,[4] permitting the construction of highly ordered scaffolds. In previous work, we exploited this behavior to develop porous hierarchically-ordered activated carbon aerogels from cellulose nanocrystals for use as supercapacitor electrodes.[5] While this work represented the first example of an activated carbon aerogel with chiral nematic CNC-derived hierarchical order, optimization of surface area and pore geometry was not performed. In this presentation, I will demonstrate our recent efforts to optimize the electrochemical performance of activated carbon aerogels. These materials may offer environmentally friendly energy storage solutions in the future.

References:

[1] Poonam, K. Sharma, A. Arora, S. K. Tripathi, J. Energy Storage 2019, 21, 801.[2] P. Simon, Y. Gogotsi, Nat. Mater. 2008, 7, 845.
[3] B. Frka-Petesic, T. G. Parton, C. Honorato-Rios, A. Narkevicius, K. Ballu, Q. Shen, Z. Lu, Y. Ogawa, J. S. Haataja, B. E. Droguet, R. M. Parker, S. Vignolini, Chem. Rev. 2023, 123, 12595.
[4] Y.-T. Xu, Y. Dai, T.-D. Nguyen, W. Y. Hamad, M. J. MacLachlan, Nanoscale 2018, 10, 3805.
[5] L. J. Andrew, E. R. Gillman, C. M. Walters, E. Lizundia, M. J. MacLachlan, Small 2023, 19, 2301947.

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