Abstract
In this study, the relation between structural, ion transport and ionic conductivity of solid biopolymer electrolyte (SBE) is discussed in details. The SBE containing 2-hydroxyethyl cellulose (2-HEC) doped with ammonium nitrate (AN) and plasticized with ethylene carbonate (EC) are prepared via solution casting method and studied according to different weight percentage (wt.%) of EC. X-ray diffraction (XRD) analysis reveals amorphous nature of SBE while Fourier transforms infrared spectroscopy (FTIR) and Transference number measurement (TNM) are used for complexation and ionic species confirmation respectively. Based on these investigations, the enhancement of ionic conductivity, σ at room temperature can be deduced due to higher amorphous nature. The addition of EC with sufficient amount has increased the flexibility of 2-HEC chain to facilitate free H+ ion transport. A weak bonding created through EC … NH4+ allows easier movement of H+ ion from one site to another complex site of 2-HEC, which is also validated theoretically via Gaussian analysis software. This has increased the mobility, μ and diffusion coefficient, D of H+ ions, as proven from TNM analysis and thus enhance the ionic conductivity, σ of plasticized 2-HEC SBE to about 10−3 Scm−1.
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