Polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly (AM-co-ECA-co-AMPS): Broadband dielectric spectroscopy investigations

In this study, the dielectric behavior of polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) was investigated by broadband dielectric spectroscopy (BDS). The dielectric spectra obtained from −70 to 70 °C showed a superposition of three dist...

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Bibliographic Details
Published in:International journal of biological macromolecules 2023-03, Vol.232, p.123443-123443, Article 123443
Main Authors: Darwish, Abdelfattah, El-Sayed, Naglaa Salem, Al Kiey, Sherief A., Kamel, Samir, Turky, Gamal
Format: Article
Language:English
Subjects:
Alginates
Dielectric Spectroscopy
Electricity
Electrode polarization
Hydrogels
Poly A
Superabsorbent hydrogel
Supercapacitor specific capacitance
Thermal analysis
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Summary:In this study, the dielectric behavior of polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) was investigated by broadband dielectric spectroscopy (BDS). The dielectric spectra obtained from −70 to 70 °C showed a superposition of three distinctive processes, electrode polarization, charge carrier's transport, and a molecular relaxation process. These dynamic processes were further analyzed along with the effect of both temperature and reduced graphene oxide (rGO) content. The development of a clear electrochemical double layer (ECDL) at the electrode/hydrogel interface strongly supports its possible application in supercapacitors' forms of energy storage. TGA, DSC, rheology, and electrochemical properties were studied. Furthermore, when the composite hydrogel with rGO content of 2.5 % was assembled into a symmetric supercapacitor, it displayed a specific capacitance of 756 F.g−1 at 1 A.g−1 and 704 F.g−1 after 5000 cycles with high capacitance retention of 93.2 %. The superior conductivity and porous structure of the rGO composite hydrogel are credited with the hydrogel's excellent electrochemical capabilities.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2023.123443