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【期刊论文】Novel proton conducting composite membranes for direct methanol fuel cell
王宇新, Lei Li, Li Xu, Yuxin Wang*
Materials Letters 57(2003)1406-1410,-0001,():
-1年11月30日
A novel composite membrane based on poly (vinyl alcohol) (PVA) with embedded phosphotungstic acid (PWA) were prepared and their proton conductivity and methanol permeability were studied. Infrared (IR) and UV spectrographic measurement indicates that the Keggin structure characteristic of the PW12O403- anion presents in the PVA membranes. Highest proton conductivity of 6.27
Composite membranes, PVA, Phosphotungstic acid, Conductivity, DMFC
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【期刊论文】Modeling the Effects of Methanol Crossover on the DMFC
王宇新, J. Zhang, Y. Wang*
FUEL CEUS 2004, 4, No. 1-2,-0001,():
-1年11月30日
A mathematic model is established to simulate the effects of methanol crossover on the DMPC. The transport and reactions of both oxygen and methanol at the cathode are described and the theory of "parallel electrode reactions" is applied to calculate the cathode over-potential caused by methanol crossover. The influence of methanol conentration, fuel cell temperature, oxygen pressure, and membrane properties on the cathode over-potential is evaluated. Simulation results show that methanol crossover considerably increases the cathode over-potential at low current density, but its effect is significantly reduced when the current density is increased to reasonable values. It also shows that of the two parameters characterizing a polymer electrolytemembrane, proton conductivity and methanol permeability, the former has more impact on the performance of a DMPC.
DMPC,, Methanol Crossover,, Mathematical Stmulation
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【期刊论文】Ion-Conducting Polymer Gels of Polyacrylamide Embedded with K2CO3
王宇新, Wensheng Song, Yuxin Wang, Huining Deng
Journal of Applied Polymer Science, Vol. 92, 2076-2081 (2004),-0001,():
-1年11月30日
A highly ionic conductive solid-gel membrane based on polyacrylamide hydrogels with a K2CO3 additive was investigated. The polymer-based gel was prepared by adding ionic species K2CO3 to a monomer solution followed by polymerization. After polymerization, the ionic species was embedded in the polymer-based gel, where it remained. The ionic species behaved like a liquid electrolyte, whereas the polymer-based solid-gel membrane provided a smooth impenetrable surface that allowed for the exchange of ions. The gel membranes were obtained in the form of thin films of reasonable mechanical strength. Their ambient temperature conductivities were in the range 10-2 to 10-1S/cm. The effect of K2CO3 concentration on the conductivity of the gels prepared was examined in the temperature range from 0 to 100℃. The microstructure and chemical composition of the gels studied were characterized by environmental scanning electron microscopy and FTIR, respectively.
conducting polymers, gels, electrochemistry, microstructure, infrared spectroscopy
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【期刊论文】A methanol barrier polymer electrolyte membrane in direct methanol fuel cells
王宇新, Hong Wu, Yuxin Wang*, Shichang Wang
Journal of New Materials for Electrochemical Systems 5, 251-254 (2002),-0001,():
-1年11月30日
A successful membrane for direct methanol fuel cell (DMFC) must not only conduct proton, but also prevent methanol crossover. With such an aim, membranes of polyvinyl alcohol (PVA)-blend-polystyrene sulfonic acid (PSSA) were prepared. The effects of curing temperature, methanol concentration and membrane composition on the ionic conductivity and the methanol permeability of the membranes were investigated. A membrane with 17% PSSA showed ionic conductivity σof 3x10−3S/cm and methanol permeability P of 2x10-8cm2/sec. The membrane would perform about 40 times better than NafionTMmembrane, if the ratio (σ/P) is adopted to characterize the performance of a membrane for DMFC.
Polymer electrolyte membrane., Direct membrane fuel cells,, polyvinyl (, PVA), -blend polystyrene sulfonic acid (, PSSA), better than Nafion
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【期刊论文】A Hybrid Membrane of Poly (vinyl alcohol) and Phosphotungstic Acid for Fucl Cells*
王宇新, LI Lei, WANG Yuxin
Chinese J. Chem. Eng., 10 (5) 614-617 (2002),-0001,():
-1年11月30日
Proton conducting membranes composed of phosphotungstic acid (PWA) and poly (vinyl alcohol) (PVA) were prepared. Conductivity and Fourier transform infrared spectrometer (FTIR) measurements show that most of the acid embedded are stable in the PVA matrix when the membrane is immerged in water or methanol solution at room temperature. Conductivity of the composite membranes scatters around 10-3 S-crn-1 at room temperature. The methanol crossover through the membranes is about an order of magnitude lower than that through Nafion 117 membrane.
Fuel cell,, proton conductor,, composite membrane,, poly (, vinyl alcohol), ,, phosphotungstic acid
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