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Yang Nilsson, Ting
Publications (2 of 2) Show all publications
Rebis, T., Yang Nilsson, T. & Inganäs, O. (2016). Hybrid materials from organic electronic conductors and synthetic-lignin models for charge storage applications. Journal of Materials Chemistry A, 4(5), 1931-1940
Open this publication in new window or tab >>Hybrid materials from organic electronic conductors and synthetic-lignin models for charge storage applications
2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 5, p. 1931-1940Article in journal (Refereed) Published
Abstract [en]

Homopolymers and copolymers of the monolignols syringol (S) and guaiacol (G) were prepared as well-defined lignin model compounds. Polymerisation was performed by phenol-formaldehyde condensation, also including the monomer hydroquinone (HQ) to extend the range of redox processes in these synthetic lignins (SLig). The chemical structures of the SLig samples were characterized by C-13 and quantitative P-31 NMR, and the molecular weight was monitored by size exclusion chromatography (SEC). Subsequently, SLig were incorporated into two different electron-conducting matrix - single-wall carbon nanotubes (SWNT) and polypyrrole (PPy), respectively. As a result, the hybrid materials, with a controlled amount of SWNT or with an unknown amount of PPy, were assembled and compared. The charge storage properties in the investigated materials are attributed to contributions from both the double-layer capacitance of the conducting matrix, and the faradaic reactions provided by quinone groups immobilized in the electrodes. The results indicate a considerable improvement of charge capacity, with the synthetic lignins incorporated in the hybrid materials. With a PPy carrying S, G and HQ, better performance is obtained than has previously been obtained with lignin derivatives, showing a maximum capacity of 94 mA h g(-1). Moreover, a low amount of electronic conductor (20% wt of SWNT) is adequate to perform efficient electron communication between redox active quinones and the electrode surface, providing 72 mA h g(-1).

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2016
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-125324 (URN)10.1039/c5ta06821e (DOI)000368839200045 ()
Note

Funding Agencies|Knut and Alice Wallenberg Foundation through project Power Papers

Available from: 2016-02-24 Created: 2016-02-19 Last updated: 2017-11-30
Yang Nilsson, T., Wagner, M. & Inganäs, O. (2015). Lignin Modification for Biopolymer/Conjugated Polymer Hybrids as Renewable Energy Storage Materials. ChemSusChem, 8(23), 4081-4085
Open this publication in new window or tab >>Lignin Modification for Biopolymer/Conjugated Polymer Hybrids as Renewable Energy Storage Materials
2015 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 8, no 23, p. 4081-4085Article in journal (Refereed) Published
Abstract [en]

Lignin derivatives, which arise as waste products from the pulp and paper industry and are mainly used for heating, can be used as charge storage materials. The charge storage function is a result of the quinone groups formed in the lignin derivative. Herein, we modified lignins to enhance the density of such quinone groups by covalently linking monolignols and quinones through phenolation. The extra guaiacyl, syringyl, and hydroquinone groups introduced by phenolation of kraft lignin derivatives were monitored by P-31 nuclear magnetic resonance and size exclusion chromatography. Electropolymerization in ethylene glycol/tetraethylammonium tosylate electrolyte was used to synthesize the kraft lignin/polypyrrole hybrid films. These modifications changed the phenolic content of the kraft lignin with attachment of hydroquinone units yielding the highest specific capacity (around 70mAhg(-1)). The modification of softwood and hardwood lignin derivatives yielded 50% and 23% higher charge capacity than the original lignin, respectively.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2015
Keywords
electrochemistry; energy storage; lignin; phenolation; renewable resources
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:liu:diva-123753 (URN)10.1002/cssc.201500570 (DOI)000366016300021 ()26507942 (PubMedID)
Note

Funding Agencies|Knut and Alice Wallenberg Foundation

Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2017-11-30Bibliographically approved
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