Nurul Faeqah MazalanMohd Ibnu Haikal Ahmad SohaimyAzwani Sofia Ahmad KhiarWan Mohd Khairul Wan Mohamed ZinMd Uwaisulqarni OsmanMohammad Fakhratul Ridwan ZulkifliRafizah RahamathullahMuthiah MuthuvinayagamMohd Ikmar Nizam Mohamad Isa2025-01-282025-01-2820252025-1-24Nurul Faeqah Mazalan1, Mohd Ibnu Haikal Ahmad Sohaimy1, Azwani Sofia Ahmad Khiar, Wan Mohd Khairul Wan Mohamed Zin, Md Uwaisulqarni Osman, Mohammad Fakhratul Ridwan Zulkifli, Rafizah Rahamathullah, MuthiahMuthuvinayagam & Mohd Ikmar Nizam Mohamad Isa . (2025). The Effect of NH4Br Composition on Electrical Behaviour of 2-Hydroxyethyl Cellulose Solid Biopolymer Electrolytes. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 126(1), 98–109. https://doi.org/10.37934/arfmts.126.1.981092289-78792334-9810.37934/arfmts.126.1.98109https://oarep.usim.edu.my/handle/123456789/26179https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/13454/11632Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Volume 126 Issue 1Page (98–109)In this study, solid biopolymer electrolytes (SBEs) were developed as an alternative to liquid electrolytes for battery applications. 2-hydroxyethyl cellulose (2HEC) served as the polymer host in the preparation of SBE films, incorporating varying amounts of ammonium bromide (NH4Br). The films were then analysed using electrical impedance spectroscopy (EIS) to investigate its electrical properties. The system containing 20 wt.% of NH4Br achieved the highest conductivity at 3.9510-5 Scm-1 at ambient temperature of 303 K. The 2HEC-NH4Br SBE film system was subjected to temperature variations between 303 K – 373 K in increments of 10 °C, revealing an increase in conductivity with rising temperature. This observation suggests that the SBE system adheres to the Arrhenius law, enabling the determination of the activation energy (Ea) through temperature dependence plotting. The Ea for the most conductive system reflects the lowest energy, indicating minimal energy required for the excitation process within the polymer chain. This Ea value offers a deeper insight into the transport parameters, including the number of mobile ions, ions mobility and diffusion coefficient, as determined through the Rice and Roth method.en-USSolid biopolymer electrolyte2-hydroxyethyl celluloseammonium bromidetransport parameteractivation energytext::journal::journal article::research article981081261