Topic
Nafion
About: Nafion is a research topic. Over the lifetime, 9110 publications have been published within this topic receiving 320865 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors describe the elaboration and characterization of new hybrid membranes all the way from the precursor solution to the evaluation of the fuel cell performances, which are extensively characterized with the determination of their physicochemical and electrochemical properties.
Abstract: Organic−inorganic hybrid membranes of Nafion and mesoporous silica containing sulfonic acid groups were synthesized using the sol−gel process with the goal of increasing the proton conductivity and water retention at higher temperatures and lowering relative humidities as well as improving the dimensional stability. These hybrid membranes were prepared via in situ co-condensation of tetraethoxysilane and chlorosulfonylphenethylsilane via self-assembly route using organic surfactants as templates for the tuning of the architecture of the silica or hybrid organosilica components. In this paper, we describe the elaboration and characterization of new hybrid membranes all the way from the precursor solution to the evaluation of the fuel cell performances. These hybrid materials were extensively characterized with the determination of their physicochemical and electrochemical properties. The membrane containing functionalized silica showed a higher ionic exchange capacity and greater water management than stan...
283 citations
TL;DR: In this article, a smart material made from a metallized ionomer membrane called Nafion has been developed to sense mechanical vibrations and generate a voltage response with a unique vibrational damping property.
Abstract: Vibration control has been achieved using state-of-the-art 'smart' materials. A 'smart' material has been developed from a metallized ionomer membrane called Nafion. This electroded material can sense mechanical vibrations and generate a voltage response. Electroded Nafion has a unique vibrational damping property. Damping with this material is achieved by dissipating the electrical energy generated as heat. This can be done using an external resistance or optimally by creating an internal conductive path. A prototype accelerometer cell has been developed which shows excellent linear characteristics and high sensitivity. It is found that the most critical element in both of the applications is the sum of the internal and the contact resistances of the electroded Nafion hydrogen pressure cell. Accordingly, a study of the resistance of these Nafion-based cells has been made and the results are included and discussed.
281 citations
TL;DR: In this paper, Nafion-silica composite membranes doped with phosphotungstic and silicotungstic acids have been investigated for application in direct methanol fuel cells at high temperature (145°C).
280 citations
279 citations
TL;DR: In this article, a two-electrode bimorph cantilever actuator immersed into an aqueous lithium chloride solution, tip deflections up to 4.5 mm were observed.
Abstract: Single wall carbon nanotube (SWNT)−Nafion composite actuators have been demonstrated for 0.1−18% w/w doping of purified SWNTs within the polymer matrix. The high purity SWNTs, >95% w/w, were homogeneously dispersed into the polymer through a series of homogenization and high sheer mixing techniques. The efficient distribution of the high aspect ratio, conductive SWNT materials allowed for the actuation of the Nafion membrane to be reached at SWNT doping levels as low as 0.5% w/w. Utilizing a two-electrode bimorph cantilever actuator immersed into an aqueous lithium chloride solution, tip deflections up to 4.5 mm were observed.
279 citations