| 1. |
- Ajjan, Fátima, et al.
(författare)
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High performance PEDOT/lignin biopolymer composites for electrochemical supercapacitors
- 2016
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Ingår i: Journal of Materials Chemistry A. - : ROYAL SOC CHEMISTRY. - 2050-7488 .- 2050-7496. ; 4:5, s. 1838-1847
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Navarro Suárez, Adriana, 1983, et al.
(författare)
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Hybrid biopolymer electrodes for lithium- and sodium-ion batteries in organic electrolytes
- 2018
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Ingår i: Sustainable Energy and Fuels. - : Royal Society of Chemistry (RSC). - 2398-4902. ; 2:4, s. 836-842
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Tidskriftsartikel (refereegranskat)abstract
- The use of earth abundant and renewable materials is encouraging for the future development of environmentally clean, safe and affordable electrodes for lithium-and sodium-ion batteries. Biohybrid electrodes based on lignin and several conducting polymers have been studied mainly for supercapacitor applications. Here, we show that biohybrid electrodes containing natural lignin and a PEDOT conjugated polymer serve as electroactive materials for lithium-and sodium-ion batteries using liquid organic electrolytes. A reversible discharge capacity of 74 mA h g(-1), at C/20 (4 mA g(-1)) rate, was achieved in the voltage range between 1 V and 4.5 V, with peak values of up to 159 mA h g(-1). These properties make the natural lignin-PEDOT hybrid material a suitable organic positive electrode for Li- and Na-ion batteries.
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