High performance PEDOT/lignin biopolymer composites for electrochemical supercapacitors
2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 5, 1838-1847 p.Article in journal (Refereed) PublishedText
Developing sustainable organic electrode materials for energy storage applications is an urgent task. We present a promising candidate based on the use of lignin, the second most abundant biopolymer in nature. This polymer is combined with a conducting polymer, where lignin as a polyanion can behave both as a dopant and surfactant. The synthesis of PEDOT/Lig biocomposites by both oxidative chemical and electrochemical polymerization of EDOT in the presence of lignin sulfonate is presented. The characterization of PEDOT/Lig was performed by UV-Vis-NIR spectroscopy, FTIR infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, cyclic voltammetry and galvanostatic charge-discharge. PEDOT doped with lignin doubles the specific capacitance (170.4 F g(-1)) compared to reference PEDOT electrodes (80.4 F g(-1)). The enhanced energy storage performance is a consequence of the additional pseudocapacitance generated by the quinone moieties in lignin, which give rise to faradaic reactions. Furthermore PEDOT/Lig is a highly stable biocomposite, retaining about 83% of its electroactivity after 1000 charge/discharge cycles. These results illustrate that the redox doping strategy is a facile and straightforward approach to improve the electroactive performance of PEDOT.
Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2016. Vol. 4, no 5, 1838-1847 p.
IdentifiersURN: urn:nbn:se:liu:diva-125323DOI: 10.1039/c5ta10096hISI: 000368839200035OAI: oai:DiVA.org:liu-125323DiVA: diva2:906104
Funding Agencies|Power Papers project from the Knut and Alice Wallenberg foundation; Wallenberg Scholar grant from the Knut and Alice Wallenberg foundation; Marie Curie network Renaissance (NA); European Research Council by Starting Grant Innovative Polymers for Energy Storage (iPes) ; Basque Government2016-02-232016-02-192016-02-23