Nur Muhitul Jalilah, Rasali (2019) A study on ionic conductivity of alginates doped with ammonium nitrate as application for solid biopolymer electrolytes. Masters thesis, Universiti Malaysia Pahang (Contributors, Thesis advisor: Samsudin, Ahmad Salihin).
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Abstract
There are numerous new discoveries in the field of electrolytes system especially in energy storage using green materials. Electrochemical devices are essential due to their huge contribution in energy storage, especially for the industrial sector. Nowadays, the usage of synthetic polymer keep increasing but these polymers are costly and not environmental friendly. Therefore, the solid biopolymer electrolytes (SBEs) system have been chosen as one of the new types of electrolytes that use natural polymer as a host polymer. This research was undertaken to investigate the conductivity and ionic transport of SBEs to develop a new type of biopolymer electrolyte. In the present research, SBEs system was developed based on alginate as the host polymer doped with various weight percentages of ammonium nitrate as a proton donor and prepared using the solution casting method. Several techniques, such as Fourier transform infrared (FTIR) spectroscopy, X-ray and diffraction (XRD), electrical impedance spectroscopy (EIS), transference number measurement (TNM) and thermogravimetric analysis (TGA) were performed to characterize this present work. FTIR analysis confirmed that interaction has occurred between the carboxylate group (COO-) from alginate and H+ where there were changes in the peaks at wavenumbers 1415 cm-1 and 1598 cm-1 that corresponded to C=O and C-O- in alginate, 1062 cm-1 that corresponded to C–O–C, and 3393 cm-1 that corresponded to the OH-group. The mobility (µ) and diffusion coefficient (D) were found to influence the ionic conductivity in the SBE system as observed via IR-deconvolution technique. X-ray diffraction analysis (XRD) revealed that the 25 wt.% NH4NO3 was the most amorphous sample, and the polymer matrix resulted in the change of state of the material from semi-crystalline to amorphous in nature. From TGA analysis, the thermal stability increased with the addition of NH4NO3. The ionic conductivity of the SBEs system was measured using EIS with a frequency range from 50 Hz to 1 MHz and achieved the maximum ionic conductivity at ambient temperature (303 K) with 5.56 × 10-5 S cm-1 for the sample containing 25 wt.% of NH4NO3. The SBEs system was found to obey the Arrhenius behavior with R2~1 where all samples were thermally activated with increasing temperature with the highest conducting sample showing the lowest value of activation energy Ea (0.11 eV). The conduction mechanism model suggested a correlated barrier hopping (CBH) model for the alginate-NH4NO3 SBEs system. The alginate-NH4NO3 SBEs system sample with the highest conductivity had a transference number, tion of 0.97, which further indicated that the conduction species is a cation. In the future, this SBE system is aimed to be used for energy storage, including as a battery or supercapacitor.
| Item Type: | Thesis (Masters) |
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| Additional Information: | Thesis (Master of Science) -- Universiti Malaysia Pahang – 2019, SV: DR. AHMAD SALIHIN BIN SAMSUDIN, NO. CD: 12370 |
| Uncontrolled Keywords: | Ionic conductivity; ammonium nitrate; solid biopolymer electrolytes (SBEs) |
| Subjects: | Q Science > Q Science (General) T Technology > T Technology (General) |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Mrs. Sufarini Mohd Sudin |
| Date Deposited: | 26 Nov 2020 07:07 |
| Last Modified: | 20 Mar 2023 08:21 |
| URI: | http://umpir.ump.edu.my/id/eprint/30049 |
| Download Statistic: | View Download Statistics |
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