Paper-Based Energy-Storage Devices Comprising Carbon Fiber-Reinforced Polypyrrole-Cladophora Nanocellulose Composite Electrodes
2012 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 2, no 4, 445-454 p.Article in journal (Refereed) Published
Composites of polypyrrole (PPy) and Cladophora nanocellulose, reinforced with 8 mu m-thick chopped carbon filaments, can be used as electrode materials to obtain paper-based energy-storage devices with unprecedented performance at high charge and discharge rates. Charge capacities of more than 200 C g-1 (PPy) are obtained for paper-based electrodes at potential scan rates as high as 500 mV s-1, whereas cell capacitances of 6070 F g-1 (PPy) are reached for symmetric supercapacitor cells with capacitances up to 3.0 F (i.e.,0.48 F cm-2) when charged to 0.6 V using current densities as high as 31 A g-1 based on the PPy weight (i.e., 99 mA cm-2). Energy and power densities of 1.75 Wh kg-1 and 2.7 kW kg-1, respectively, are obtained when normalized with respect to twice the PPy weight of the smaller electrode. No loss in cell capacitance is seen during charging/discharging at 7.7 A g-1 (PPy) over 1500 cycles. It is proposed that the nonelectroactive carbon filaments decrease the contact resistances and the resistance of the reduced PPy composite. The present straightforward approach represents significant progress in the development of low-cost and environmentally friendly paper-based energy-storage devices for high-power applications.
Place, publisher, year, edition, pages
2012. Vol. 2, no 4, 445-454 p.
energy-storage devices, polypyrrole, Cladophora cellulose, carbon filaments, supercapacitors
Engineering and Technology Nano Technology
Research subject Engineering Science with specialization in Nanotechnology and Functional Materials
IdentifiersURN: urn:nbn:se:uu:diva-174379DOI: 10.1002/aenm.201100713ISI: 000302347100008OAI: oai:DiVA.org:uu-174379DiVA: diva2:527765