Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 39, Pages 16516-16522Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03332a
Keywords
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Funding
- National Basic Research Program of China [2012CB932500]
- National Natural Science Foundation of China [51073062]
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By using the in situ polymerization of aniline in an aqueous solution of sodium alginate, we prepared reinforced conducting hydrogels (PANI-SA) with good conductivity (similar to 10(-3) S cm(-1)). SEM images indicated that the microstructure of PANI-SA hydrogels was a typical 3D nano-fiber network formed by the entanglement of the PANI and SA molecular chains, leading to a good compressive strength (similar to 41 kPa). Because the system does not contain any adhesives and conducting filters, the PANI-SA conducting hydrogels with self-supported structures can be directly employed as electrode materials for supercapacitors. A study of cyclic voltammograms indicated that the currents of the cathodic peak significantly increased with an increase in the scan rate, indicating that the electrode materials possess good responsiveness. As a reference, traditional compressive tablet electrodes were also prepared by mixing the powder of PAN 1-SA xerogels, adhesive and conducting filler. The results of galvanostatic charge/discharge and impedance show that PAN 1-SA hydrogels possess longer discharge times, higher specific capacitance and lower electronic resistance in comparison with compressive tablet electrodes. After 1000 cycles of charge/discharge, there is almost no difference in the retained specific capacitance between PANI-SA hydrogels electrodes and compressive tablet electrodes. The easily fabricated PANI-SA conducting hydrogels show great potential as electrode materials for supercapacitors.
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