High proton conductivity and low fuel crossover of polyvinylidene fluoride–hexafluoro propylene–silica sulfuric acid composite membranes for direct methanol fuel cells

2011 ◽  
Vol 11 (3) ◽  
pp. 896-902 ◽  
Author(s):  
G. Gnana kumar ◽  
Ae Rhan Kim ◽  
Kee Suk Nahm ◽  
Dong Jin Yoo
Keyword(s):  
Sulfuric Acid ◽  
Proton Conductivity ◽  
Polyvinylidene Fluoride ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Silica Sulfuric Acid ◽  
High Proton Conductivity ◽  
High Proton ◽  
Direct Methanol ◽  
Methanol Fuel Cells

scholarly journals On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

2011 ◽  
Vol 196 (22) ◽  
pp. 9176-9187 ◽  
Author(s):  
Zhonghua Zhang ◽  
François Désilets ◽  
Valeria Felice ◽  
Barbara Mecheri ◽  
Silvia Licoccia ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Low Temperature ◽  
Proton Conductivity ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Suppression of methanol cross-over in novel composite membranes for direct methanol fuel cells

2009 ◽  
Vol 81 (12) ◽  
pp. 2309-2316 ◽  
Author(s):  
Yong Fang ◽  
Ruiying Miao ◽  
Tongtao Wang ◽  
Xindong Wang
Keyword(s):  
Fuel Cells ◽  
Proton Conductivity ◽  
Direct Methanol Fuel Cells ◽  
Base Material ◽  
Proton Conductor ◽  
Composite Membranes ◽  
Methanol Permeability ◽  
Poly Vinyl Alcohol ◽  
Direct Methanol ◽  
Methanol Fuel Cells

A series of novel composite membranes was prepared by using poly(vinyl alcohol) (PVA) with polyimide (PI) as base material and 8-trimethoxysilylpropyl glycerine ether-1,3,6-pyrenetrisulfonic acid (TSGEPS) as proton conductor for direct methanol fuel cells (DMFCs). The parameters of membranes, including water sorption, hydrolysis stability, dimensional stability, proton conductivity, and methanol permeability were studied. The proton conductivity of the membranes is in the order of 10–2 S/cm, and the membranes show better resistance to methanol permeability (1.51 × 10–7 cm2 s–1) and better selectivity (20.6 × 104 S cm–3 s) than those of Nafion115 under the same measurement conditions.

Development of Inorganic-organic Membranes Consisting of ZrO2·nH2O and Sulfonated-PES for Direct Methanol Fuel Cells

2012 ◽  
Vol 15 (2) ◽  
pp. 83-88 ◽  
Author(s):  
Takayuki Hirashige ◽  
Tomoichi Kamo ◽  
Takao Ishikawa ◽  
Takeyuki Itabashi
Keyword(s):  
Proton Conductivity ◽  
Composite Membrane ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Methanol Permeability ◽  
Maximum Power Density ◽  
Trade Off ◽  
Direct Methanol ◽  
Methanol Fuel Cells ◽  
Sulfonated Poly

We investigated inorganic-organic membranes consisting of sulfonated-poly(ether sulfone) (S-PES) and ZrO2·nH2O with the aim of improving proton conductivity and blocking methanol. We prepared excellent uniform membranes by the method using ZrOCl28H2O as a precursor. The proton conductivity of the ZrO2·nH2O/S-PES (EW=850) composite membrane with 50wt% ZrO2·nH2O content was about four times higher than that of S-PES (EW=850). On the other hand, the methanol permeability of the ZrO2·nH2O/S-PES (EW=850) composite membrane with 50wt% ZrO2·nH2O content was almost the same as that of S-PES (EW=850). These results mean in the composite membranes, the trade-off relationship between proton conductivity and methanol permeability found in S-PES was improved. The initial I-V performance of an MEA consisting of the ZrO2·nH2O/S-PES (EW=850) composite membrane with 50wt% ZrO2·nH2O content showed a maximum power density of 65 mW cm-2 at 260 mA cm-2.

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