Nafion hydrophobic
WitrynaIn this paper, SSC-CCM is prepared by the SSC-PFSA (Aquivion, EW 720) ionomer, and the comparative sample (LSC-CCM) is based on the LSC-PFSA ionomer (Nafion, EW 1100). Compared with LSC-CCM, SSC ... Nafion is a brand name for a sulfonated tetrafluoroethylene based fluoropolymer-copolymer discovered in the late 1960s by Dr. Walther Grot of DuPont. Nafion is a brand of the Chemours company. It is the first of a class of synthetic polymers with ionic properties that are called ionomers. Nafion's unique … Zobacz więcej Nafion can be produced as both a powder resin and a copolymer. It has various chemical configurations and thus several chemical names in the IUPAC system. Nafion-H, for example, includes the following … Zobacz więcej Nafion derivatives are first synthesized by the copolymerization of tetrafluoroethylene (TFE) (the monomer in Teflon) and a derivative of a perfluoro (alkyl vinyl ether) with sulfonyl acid fluoride. The latter reagent can be prepared by the pyrolysis of its respective Zobacz więcej The morphology of Nafion membranes is a matter of continuing study to allow for greater control of its properties. Other properties such as water management, hydration stability at high temperatures, electro-osmotic drag, as well as the mechanical, … Zobacz więcej • What Nafion Membrane is Right for an Electrolyzer / Hydrogen Generation? • Homepage of Walther G. Grot • Walther G. Grot: "Fluorinated Ionomers" • Isotopic effects on Nafion conductivity Zobacz więcej The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: • It … Zobacz więcej Nafion's properties make it suitable for a broad range of applications. Nafion has found use in fuel cells, electrochemical devices, chlor-alkali production, metal-ion recovery, water Zobacz więcej Normal Nafion will dehydrate (thus lose proton conductivity) when the temperature is above ~80 °C. This limitation troubles the design of fuel cells because higher temperatures … Zobacz więcej
Nafion hydrophobic
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Witryna1 mar 2024 · The Nafion to O-CNT ratio was determined via a parametric study, 1:1 mass ratio was found to provide the most hydrophobic surface. Each ink was well dispersed by an ultrasonic mixer and spray-coated onto the substrate. The results suggest a synergistic interaction between O-CNT and Nafion which renders the … WitrynaEncouragingly, the copolymer membranes demonstrate a similar performance to Nafion under well hydrated conditions, which can be further optimized by a combination of numerical modeling and experimental characterization to develop new-generation membranes with better properties. ... (hydrophobic) domains, whose proton …
Witryna19 lis 2024 · On the other hand, when the hydration level of the membrane decreases, the sulfonic groups have a greater occupation on the NP surface, covering the active … WitrynaHere, a hydrophobic electrode surface was constructed by modifying the CuO nanowire electrode with a thick Nafion overlayer, which exhibited enhanced selectivity toward …
WitrynaThe highly hydrophobic fluorocarbon backbone of Nafion favorably interacts with hydrophobic PEDOT of PEDOT:PSS. These factors give rise to the extension of π … Witryna2 sie 2024 · The architecture of these copolymers is comprised of a hydrophobic backbone with flexible hydrophilic ionic side chains, which is similar to state-of-the-art perfluorosulfonic acid PEMs (such as Nafion ® membranes). Their morphology can be controlled by varying the length and periodicity of side chains.
Witryna11 lip 2012 · However, when Nafion is mixed with an excess of hydrophobic alkyl ammonium salts such as tetrabutylammonium bromide (TBAB), the quaternary ammonium cations replace the protons and become the counter ions to the sulfonate groups on the polymer side chains (Figure 1). This results in larger micelles and …
Witryna用全氟碘酸质子交换膜作为质子交换膜燃料电池（PEMFC）电解质，简化了水和电解质的管理。本文研究了该燃料电池质子交换膜厚度对电池性能影响；性能最佳的Nafion112膜和低铂载量E－TEK电极组装的PEMFC，在输出功率高达0．95W／cm^2；同时考察了电池的能量转换效率、E－TEK电极中铂电催化剂利用率和 ... pjsip python tutorialWitryna13 kwi 2024 · Nafion, a DuPont product, is currently performing exceptionally well. A highly hydrophobic fluorocarbon backbone and randomly positioned perfluoro ether side chains that end in sulfonic acid radical comprise the random copolymer known as Nafion. Nafion will generate a special phase separation structure due to hydrophobic and … pjsekai skillsWitryna16 lis 2012 · Most of the Nafion ® structural models are primarily based on the Eisenberg description, which considers ionic clusters dispersed in a hydrophobic polymeric matrix to reduce the total free energy of the system . These models have been used to describe the strong water swelling behavior of Nafion and the pronounced dependence of … pjsekai sonolusWitryna16 Owing to its micellar structure with hydrophobic domains, 17,18 Nafion has been investigated as a support matrix for enzyme immobilization. Nafion/oxidase systems have been developed to enhance ... pjsekai tsukasaWitrynaNafion ionomer, composed of hydrophobic perfluorocarbon backbones and hydrophilic sulfonic acid side chains, is the most widely used additive for preparing catalyst layers … pjsua2 python installWitrynaThe Nafion™ perfluorinated membranes have the extraordinary chemical and thermal stability of Teflon™ resins. While Teflon ™ resin is one of the most hydrophobic substances known, Nafion™ membranes are one of the most hydrophilic. They absorb water and some polar organics rapidly, even at room temperature, in amounts pjt kemenkesWitrynaIn contrast, bare Nafion, Nafion/CNTs, and Nafion-212 membranes exhibited inferior proton conductivity, current output, power output, and durability under identical HAFC operating conditions. View pjvitty