Normal view MARC view ISBD view

Characterization of alginate-pva doped with ammonium iodide based bio polymer electrolytes / Muhammad Ammar Hairul Nizam

By:

Muhammad Ammar Hairul Nizam [author.]

Material type: Text

text

Media type:

unmediated

Carrier type:

volume

ISBN:

THE0010793 (Local)

Subject(s):

Dissertation note: Thesis (Master of Science) -- Universiti Malaysia Pahang - 2026 Abstract: Polymer electrolytes have attracted significant attention in recent years due to their potential applications in next-generation electrochemical devices, offering flexibility, lightweight design, and enhanced safety compared to liquid electrolytes. However, conventional polymer electrolytes often suffer from low ionic conductivity, while biobased polymer electrolytes, despite being environmentally friendly, typically exhibit poor mechanical strength and limited ionic transport performance, which restrict their practical applications. Among them, bio-based polymer electrolytes are particularly appealing, as they combine environmental sustainability with desirable electrochemical performance. This thesis focuses on the development of bio-polymer blend electrolytes (BBEs) composed of alginate and polyvinyl alcohol (PVA) doped with varying concentrations of ammonium iodide (NH₄I). The main objective is to investigate the effect of NH₄I doping on the physicochemical and ionic transport properties of the BBEs. The samples were synthesized via the solution casting technique, and characterized using Fourier Transform Infrared (FTIR) spectroscopy, Differential Scanning Calorimetry (DSC), and Electrical Impedance Spectroscopy (EIS). FTIR analysis confirmed complexation between NH4I and the polymer matrix, while DSC revealed a reduction in glass transition temperature (Tg) and improved thermal stability with increased NH4I content. Ionic conductivity measurements showed a maximum value of 1.01 × 10⁻⁵ S cm⁻¹ at 25 wt.% NH4I, with conductivity following Arrhenius behavior and exhibiting a low activation energy (Ea) of 0.14 eV. Dielectric studies indicated that enhanced conductivity was due to increases in diffusion coefficient (D), ionic mobility (μ), and charge carrier density (n). Transference number analysis using Bruce and Vincent’s method confirmed that cations were the dominant charge carriers, with a transport number of 0.45 in the highest conducting sample. Overall, these results demonstrate that NH4I-doped alginate–PVA BBEs possess promising ionic conduction and thermal properties, making them suitable candidates for application in electrochemical devices.

Tags from this library: No tags from this library for this title. Log in to add tags.

Average rating: 0.0 (0 votes)

Holdings ( 2 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode
Thesis	UMPLIB GAMBANG	Non-fiction	FSTI .A46 2026 r Thesis (Browse shelf(Opens below))	1	Not for loan		T000005602
Accompanying Material	UMPLIB GAMBANG	Non-fiction	CD14040 (Browse shelf(Opens below))	1	In Transit		T000005603

Faculty of Industrial Sciences and Technology

Thesis (Master of Science) -- Universiti Malaysia Pahang - 2026

Include bibliographical reference

Polymer electrolytes have attracted significant attention in recent years due to their potential applications in next-generation electrochemical devices, offering flexibility, lightweight design, and enhanced safety compared to liquid electrolytes. However, conventional polymer electrolytes often suffer from low ionic conductivity, while biobased polymer electrolytes, despite being environmentally friendly, typically exhibit poor mechanical strength and limited ionic transport performance, which restrict their practical applications. Among them, bio-based polymer electrolytes are particularly appealing, as they combine environmental sustainability with desirable electrochemical performance. This thesis focuses on the development of bio-polymer blend electrolytes (BBEs) composed of alginate and polyvinyl alcohol (PVA) doped with varying concentrations of ammonium iodide (NH₄I). The main objective is to investigate the effect of NH₄I doping on the physicochemical and ionic transport properties of the BBEs. The samples were synthesized via the solution casting technique, and characterized using Fourier Transform Infrared (FTIR) spectroscopy, Differential Scanning Calorimetry (DSC), and Electrical Impedance Spectroscopy (EIS). FTIR analysis confirmed complexation between NH4I and the polymer matrix, while DSC revealed a reduction in glass transition temperature (Tg) and improved thermal stability with increased NH4I content. Ionic conductivity measurements showed a maximum value of 1.01 × 10⁻⁵ S cm⁻¹ at 25 wt.% NH4I, with conductivity following Arrhenius behavior and exhibiting a low activation energy (Ea) of 0.14 eV. Dielectric studies indicated that enhanced conductivity was due to increases in diffusion coefficient (D), ionic mobility (μ), and charge carrier density (n). Transference number analysis using Bruce and Vincent’s method confirmed that cations were the dominant charge carriers, with a transport number of 0.45 in the highest conducting sample. Overall, these results demonstrate that NH4I-doped alginate–PVA BBEs possess promising ionic conduction and thermal properties, making them suitable candidates for application in electrochemical devices.