Effect of NaCIO4 dopant on chemical bond and ionic conductivity of benzoyl kappa-carrageenan gel biopolymer electrolyte

Gel biopolymer electrolytes based on benzoyl kappa-carrageenan (Bz-Kcar) as polymer host and sodium perchlorate (NaC104) as dopant was successfully produced. The concentration of NaC104 was varied from 0.5 to 3.0 wt.% in order to investigate its effects on the chemical bonds and the ionic conductivities (o) of the electrolytes. Characterizations were performed by Fourier-transform infrared spectroscopy (FTIR) and electrochemical impedance analysis (EIS). Significant changes in the FTIR spectra were detected indicated chemical interactions between Bz-kcar and NaC104. The ionic conductivity of the gel electrolytes increased with higher concentration of NaC104, suggesting that NaC104 was an effective charge carrier in the system. The highest o of the gel electrolyte attained at ambient temperature (298 K) was 1.29 x 10-3 S cm-I . The temperature dependence of conductivity is Arrhenian in the studied temperature range and achieved elevated o of 7.90 x 10-3 S cm -I at 100 o c with small values in the activation energy (Ea) were observed in all the electrolytes prepared