Papers by Keyword: Ionic Conductivity

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Authors: Wei Wei Cui, Dong Yan Tang, Li Li Guan
Abstract: Single ion conducting polymer electrolytes synthesized through a copolymer poly(lithium 2-acrylamido-2-methylpropanesulfonic acid-co-vinyl triethoxysilane) and a crosslinker poly(etheylene glycol) dimethacrylate (PEGDMA) were prepared. Scanning electron microscope (SEM) was used to observe the morphology of the surface and cross-section of the polymer electrolyte membrane. AC impedance and linear sweep voltammetry were used to investigate the electrochemical properties of the polymer electrolytes. It was found that the obtained membrane had a typical amorphous structure and possessed a smooth surface. The bulk resistance of the polymer electrolyte increased with the increase in the plasticizer uptake. The electrochemical stability increased with the increase in the content of VTES.
Authors: D. Prusinowska, M. Siekierski, W. Wieczorek, Jan Przyluski
Authors: Satyabrata Si
Abstract: The massive exploitation of modern technology results in increasing demand of energy of the entire world, which has urged extensive research and development in the areas of energy production from non-conventional resources, their storage and distribution. Electrolyte is one of the components in various electrochemical devices, like solar cells, fuel cells, rechargeable battery etc. Besides the conventional liquid electrolytes, polymer based electrolytes gain particular attention because of their solid nature, flexibility and ease of availability. For the last few decades, use of inorganic nanoparticles as additives is one of the most promising ways to improve the electrochemical performance of polymer electrolytes. The resulting nanocomposite polymer electrolytes can display enhanced conductivity, mechanical stability and improved interfacial stability towards electrode materials. This review highlights the recent research efforts given to the nanocomposites systems containing various layered transition metal hydroxides for making solid polymer electrolytes. Also various approaches adopted to understand the ion conduction mechanism of solid polymer electrolytes has also been discussed.
Authors: Yasuhiro Harada, Yoshitaka Ishikawa, Jun Kuwano, Yasukazu Saito
Authors: Jesús Mauricio González Martínez, Licurgo Borges Winck, Cosme Roberto Moreira da Silva
Abstract: The gadolinia doped ceria was developed in Ce0,8Gd0,2O1,9 composition, with the objective to study the influence of calcination temperature on the ionic conductivity of sintered samples (pellets) used as solid electrolyte for the fuel cells applications. The powder was synthesized by the polymeric precursor method (Pechini) from cerium and gadolinium nitrates hexahydrates, obtaining a polymeric resin characterized by infrared spectroscopy. The heat treatments at 600 and 800°C resulted on oxides formation which have been characterized by infrared spectroscopy and X-ray diffraction for each sample. In each case, the fluorite type structure was identified. The pellets were formed by uniaxial pressure and sintered at 1500°C with relative densities of 93.1 and 89.4% for the samples calcined at 600 and 800°C, respectively. The microstructure evaluation was performed by scanning electron microscopy, and the electrical characterization was carried out by impedance spectroscopy, reaching a conductivity of 1.49x10-4 S/cm at 400°C in this work.
Authors: Mirosław M. Bućko, Magdalena Dudek, Grzegorz Róg
Authors: Johar Banjuraizah, Phan Khor Shing, Nur Azmera Zaili
Abstract: Pure 8 mol% yttria stabilized zirconia (YSZ) and 3mol % of Fe-doped YSZ electrolyte from different source of Fe (p)in oxide form (pure iron oxide powders, Fe2O3) and Fe(s) source from salt (iron nitrate, Fe(NO3)3) were prepared and sintered at 1550°C for 2 hours. The effect of Fe dopant from different source of Fe to the crystal structure and ionic conductivity of 8YSZ samples were investigated. The addition of 3 mol % Fe from iron nitrate source (sample 3Fe(s)YSZ) greatly enhanced the growth of monoclinic phase as compared to 8YSZ sintered samples while the addition of 3 mol % Fe from pure iron oxide powder source (sample 3Fe(s)YSZ) enhanced the crystallization of cubic phase and decrease the monoclinic phase. The addition of Fe significantly enhanced the ionic conductivity of 8YSZ sample for both source of Fe. However, 3Fe(p)8YSZ has smaller grain resistivity and thus has higher conductivity compared to 3Fe(s)YSZ.
Authors: N. Ammakutti Sridevi, K. Karuppasamy, C. Vijil Vani, S. Balakumar, X. Sahaya Shajan
Abstract: Chitin and chitosan, the most abundant biopolymers possess several excellent advantages such as biodegradability, ecological friendly, biocompatibility, low toxicity, bioactive, antimicrobial activity and low immunogenicity. They occur as ordered crystalline micro fibrils and are useful in applications that require reinforcement and strength. Nanochitosan was prepared from chitosan by oxidation degradation method using H2O2. Nanocomposites polymer electrolyte system composed of polyethylene oxide (PEO) as the host polymer, magnesium perchlorate Mg(ClO4)2 as salt and different concentration of nano-sized chitosan as filler have been studied. The effects of addition of nanochitosan on the ionic conductivity of composite polymer electrolytes are investigated and it is found to rise upon one order (10-3 Scm-1). The complexation behavior of PEO and Mg(ClO4)2 are verified through FT-IR studies. The nanocomposite films possess uniform surface morphology which has been identified by SEM analysis.
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