توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Poly vinyl alcohol\BaZrO3 nanocomposite membranes for the application of PEMFC
اطلاعات انتشار: دومین کنفرانس ملی هیدروژن و پیل سوختی، سال
تعداد صفحات: ۵
Poly vinyl alcohol–BaZrO3 (PB) and poly vinyl alcoholpoly vinyl pyrrolidone–BaZrO3 (PPB) nanocomposite membranes have been prepared with solutions casting method, with using a Glutaraldehyde (GA) as cross linking agent. The effect of BaZrO3 nanoparticles content and mass ratio of PVA: PVP on the proton conductivity, water uptake and also the morphology of the membranes were investigated. The results showed that, water uptake and proton conductivity of nanocomposite membranes due to hydrophilic nature of BaZrO3 nanoparticles and PVP were higher than that of the PVA based membrane. PPB nanocomposite membranes containing 1 wt % of nanoparticles and mass ratio of PVA: PVP (76:23) demonstrated higher water uptake (3059) and proton conductivity (1.9 ×10–2 S\cm) than PB and other PPB nanocomposite membranes.<\div>

۲Synthesis and characterization of poly vinyl alcohol\poly vinyl pyrrolidone\MnTiO3 nano–hybrids for PEM fuel cells
اطلاعات انتشار: دومین کنفرانس ملی هیدروژن و پیل سوختی، سال
تعداد صفحات: ۶
PVA (poly vinyl alcohol)–MnTiO3 (PM) and PVA–PVP (poly vinyl pyrrolidone)–MnTiO3 (PPM) nanocomposite membranes have been prepared with solutions casting method. Glutaraldehyde (GA) was used as cross linking agent. The results showed that the proton conductivity and water uptake of the nanocomposite membranes due to hydrophilic nature of MnTiO3 nanoparticles were higher than that of the PVA membrane. PPM membranes containing 5 wt. % of MnTiO3 nanoparticles and PVA:PVP 80:20, demonstrated higher thermal stability, water uptake (3107) and proton conductivity (2.1 ×10–2 S\cm) than PM membranes, due to hydrophilic effect of PVP, which can made strong hydrogen–bonding, intense intra–molecular interaction and reduce the crystallinity of the PVA polymer.<\div>

۳Evaluation the Effects of pH and Concentration Changes on Pt Electrocatalyst Layer Structure via Electroless Plating Method
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۴
The aim of this work is to study platinum deposition through electro–less method on the surface and sub–surface of the Nafion membrane. In this study, we have managed to control the size, amount of penetration and density of platinum layer via regulation of pH and concentration of salt solution of platinum in order to prepare well–dispersed Pt nanoparticles in the electro–catalyst layer. The development of an optimum electro–catalysts layer with low–Pt–loadings and high–Pt–utilization is critical for good performance. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (ESI) techniques were used to measure exchange current densities. The SEM images were applied to investigate the penetration and dispersion of Pt nano–particles. The obtained results demonstrate that the acidic pH cause to establish finer and denser Pt nano–particles and also more current density.<\div>

۴Interacial polymerization of polyaniline nanofibers and effect of oxidant concentration on morphology
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۷
Conductive polymers had been the topic of the large number of investigation during last decades because of their unique properties. Among the conducting polymers, PANI, Due to ease of synthesis, processing environmental stability and low synthetic cost is useful in wide area of application. Interfacial polymerization reaction is carried out using an organic–based solution of aniline as monomer and the water–based solution of oxidant agent ammonium peroxydisulfat (APS) containing HCl as doping agent. The polyaniline nanofiber are polymerized at the organic\aqueous interface. In the current work, polyaniline nanofibers were prepared using the interfacial polymerization process and the effect of the concentration of APS as oxidant on the morphology, solubility and the yield of the reaction was investigated at fixed acid and aniline concentration, 0.1 M. The samples were characterized using Fourier transform infrared (FT–IR) and UV–Visible spectroscopy (UV–VIS) and scanning electron microscopy (SEM). It has been found that difference aniline\APS molar ratios effect on the solubility and uniformity of nanofibers PANI. The more uniform polyaniline nanofibers have been achieved, when aniline\APS Molar ratios is equivalent to one.<\div>

۵Fabrication and Characterization of Inorganic–Conducting Polymer–Based BHJ Polymer Solar Cells
نویسنده(ها): ،
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۵
In this work TiO2 and Ag–TiO2 nanoparticles were synthesized via sol–gel process and applied as electron acceptors in the fabrication of polymer solar cells. Researches show that compositing of conducting polymers as an important component of polymer solar cells with inorganic nanoparticles can improve the charge dissociation in the active layer. It can also enhance the interfaces between the active layer and the metal electrode which in turn this leads to a higher charge collection at the electrodes and higher power conversion efficiency. The synthesized nanoparticles were characterized by x–ray diffraction spectroscopy and scanning electron microscopy equipped with energy dispersive x–ray (EDX) unit. Results confirmed the successful synthesis of anatase TiO2 and Ag–TiO2 nanoparticles with a homogenous size distribution of approximately 20 nm. The variations in the band gap of the polymer as a function of the type of applied nanoparticles were monitored using cyclic voltammetry. In order to study the effect of the type of inorganic nanoparticles on the photovoltaic performance of the polymer solar cells the following devices where prepared: ITO\TiO2 paste\P3HT\Au, ITO\TiO2 paste\P3HT:TiO2\ Au and ITO\TiO2 paste\P3HT:Ag– TiO2\ Au. The J–V characterization of these devices showed that Ag–TiO2 possessed the most improving impact on Jsc, Voc and FF of the devices.<\div>
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