Electrical impedance and conduction mechanism analysis of biopolymer electrolytes based on methyl cellulose doped with ammonium iodide

• Published in: Ionics 2016-11, Vol.22 (11), p.2157-2167
• Main Authors: Salleh, N. S., Aziz, Shujahadeen B., Aspanut, Z., Kadir, M. F. Z.
• Format: Article
• Language: English
• Subjects: Biopolymers; Cellulose; Chemistry; Chemistry and Materials Science; Complex permittivity; Condensed Matter Physics; Debye temperature; Degree of crystallinity; Electrical impedance; Electrochemistry; Electrolytes; Emission analysis; Energy Storage; Field emission microscopy; High temperature; Optical and Electronic Materials; Original Paper; Renewable and Green Energy; Room temperature; Temperature dependence; Thermal conductivity
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-016-1731-0

In the present study, the potential of methyl cellulose (MC) as biopolymer electrolyte (BPE) will be studied extensively by means of conductivity and the conduction mechanism. BPE films based on MC doped with ammonium iodide (NH 4 I) salt were prepared by solution-casting method. X-ray diffraction (XRD) explains that the conductivity enhancement of the electrolytes is affected by the degree of crystallinity. Field emission scanning electron microscopy (FESEM) analysis shows the difference in the electrolyte’s surface with respect to NH 4 I. On addition of 40 wt.% of NH 4 I, the highest room temperature conductivity of (5.08 ± 0.04) × 10 −4  S cm −1 was achieved. The temperature dependence relationship for the salted electrolyte was found to obey the Arrhenius rule where R 2 ∼1 from which the activation energy ( E a ) was evaluated. The dielectric study analyzed using complex permittivity ε* for the sample with the highest conductivity at elevated temperature shows a non- Debye behavior. These salted electrolytes follow the correlated barrier hopping (CBH) model.