Investigation of Methanol Permeability and Ionic Conductivity of EMI[sup +]-Doped Nafion Membranes

2004 ◽  
Vol 151 (7) ◽  
pp. A1020 ◽  
Author(s):  
Robert A. Banaszak ◽  
Sara A. Arbaugh ◽  
Elanor D. Steffee ◽  
Radha Pyati
Keyword(s):  
Ionic Conductivity ◽  
Methanol Permeability ◽  
Nafion Membranes

scholarly journals Modification of Nafion Membranes with Polyaniline to Reduce Methanol Permeability

2015 ◽  
Vol 162 (14) ◽  
pp. E325-E333 ◽  
Author(s):  
J. Gonzalez-Ausejo ◽  
L. Cabedo ◽  
J. Gámez-Pérez ◽  
S. Mollá ◽  
E. Giménez ◽  
...  
Keyword(s):  
Methanol Permeability ◽  
Nafion Membranes

A Method for Improving Ionic Conductivity of Nafion Membranes and its Application to PEMFC

2006 ◽  
Vol 13 (5) ◽  
pp. 379-385 ◽  
Author(s):  
Hsiu-Li Lin ◽  
T. Leon Yu ◽  
Fang-Hsin Han
Keyword(s):  
Ionic Conductivity ◽  
Nafion Membranes

scholarly journals Pengaruh aditif terhadap karakteristik membran elektrolit polieter-eter keton tersulfonasi untuk aplikasi sel bahan bakar metanol langsung

2018 ◽  
Vol 6 (1) ◽  
pp. 563
Author(s):  
Sri Handayani ◽  
Eniya Listiani Dewi ◽  
Widodo Wahyu Purwanto ◽  
Roekmijati W. Soemantojo
Keyword(s):  
Fuel Cell ◽  
Ionic Conductivity ◽  
Direct Methanol Fuel Cell ◽  
Methanol Permeability ◽  
Electrolyte Membrane ◽  
Polyether Ether Ketone ◽  
Sulfonated Polyether Ether Ketone ◽  
Direct Methanol ◽  
Ether Ketone ◽  
Methanol Fuel Cell

The influence of the additive on the characteristics of the sulfonated polyether-ether ketone electrolyte membrane for direct methanol fuel cell applicationsThe weakness of comercial membrane (Nafion-117) for the application of direct methanol fuel cell is highly methanol cross-over. It is decreasing the cell voltage. To minimize the methanol cross-over in a membrane, there are two methods can beproposed: the modification of conventional membrane structure (Nafion-117) and development of novel electrolyte membrane (and modified). PEEK can be used as one of alternatives for  direct methanol fuel cell membranes. This PEEK polymer has the stability of chemistry mechanic and thermal. In order to increase ionic conductivity and to decrease methanol permeability. It is necessary to make the modification of sulfonated polyether-ether ketone (sPEEK) with adding higroscopic inorganic additives (SiO2 and  H-zeolit). The type of additive which can increase ionic conductivity for sPEEK membrane is SiO2 (3 wt.%) 2 times, and decrease ionic conductivity 1,7 times for H-zeolite. Methanol permeability of membrane sPEEK with silica added increase 5 times and H-zeolite 2 times compared to sPEEK membrane without additive. Although composite membrane have increasing methanol permeability but that values are still lower than Nafion-117. Conclusion, the addition of SiO2 as additives has given best performance 0,09 S/cm ionic conductivity, 10-7 cm2/S methanol permeability dan 17 wt.% water swelling.Keywords: Additive, Direct Methanol Fuel Cell, Polyether-Ether Ketone, SiO2, H-ZeoliteAbstrakKelemahan membran komersial (Nafion-117) untuk aplikasi sel bahan bakar metanol langsung (direct methanol fuel cell) adalah methanol crossover yang tinggi, hal tersebut yang dapat menurunkan kinerja voltase sel secara keseluruhan. Dalam rangka mengurangi methanol crossover melalui membran, ada dua pendekatan yaitu modifikasi struktur membran konvensional (Nafion) atau pengembangan membran polimer elektrolit (dan modifikasi). Salah satu polimer aromatik yang menarik perhatian sebagai membran elektrolit pada aplikasi DMFC adalah polieter-eter keton (PEEK) karena polimer tersebut mempunyai kestabilan kimia, mekanik dan panas. Agar dapat meningkatkan konduktivitas ionik dan menurunkan permeabilitas metanol dilakukan modifikasi pada polieter-eter keton tersulfonasi (sPEEK) yaitu dengan menambahkan aditif anorganik yang bersifat higroskopik (SiO2 dan H-zeolit) Jenis aditif yang dapat meningkatkan konduktivitas ionik untuk membran elektrolit adalah SiO2 (3% berat) yaitu  sebesar 2 kali, sedangkan H-zeolit menurunkan konduktivitas ionik sebesar 1,7 kali. Permeabilitas metanol membran sPEEK yang ditambahkan SiO2 naik hingga 5x sedangkan yang ditambahkan H-zeolit hanya 2 kali dari membran sPEEK tanpa aditif. Walaupun membran komposit meningkatkan permeabilitas metanol tetapi nilai tersebut masih dibawah membran Nafion-117. Jadi penambahan aditif yang baik dalam membran berbasis polieter-eter keton tersulfonasi adalah SiO2 yang mempunyai konduktivitas ionik 0,09 S/cm, permeabilitas metanol 10-7 cm2/S dan swelling air 17%.Kata kunci : Aditif, Polieter-Eter Keton, Sci Bahan Bakar Metanol Langsung, SiO,, H-Zeolit

scholarly journals An Investigation of Chitosan-Grafted-Poly(vinyl alcohol) as an Electrolyte Membrane

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Panu Danwanichakul ◽  
Pongchayont Sirikhajornnam
Keyword(s):  
Mechanical Properties ◽  
Ionic Conductivity ◽  
Vinyl Alcohol ◽  
Direct Methanol Fuel Cell ◽  
Methanol Solution ◽  
Methanol Permeability ◽  
Poly Vinyl Alcohol ◽  
Electrolyte Membrane ◽  
Direct Methanol ◽  
Methanol Fuel Cell

The membrane of chitosan-grafted-poly(vinyl alcohol)/poly(vinyl alcohol) (CS-g-PVA/PVA) was investigated along with chitosan (CS), PVA, CS/PVA, and Nafion 117 membranes for transport properties of water and methanol, mechanical properties, and ionic conductivity. The ionic conductivity,σ, of the crosslinked CS-g-PVA/PVA membrane was about 4.37 mS cm−1and the methanol permeability,PS, was1.8×10−7 cm2s−1. These gave the selectivity,σ/PS, of 23.95 mS·s·cm−3compared with 16.35 mS·s·cm−3of Nafion 117 membrane. The conductivity of the crosslinked CS-g-PVA/PVA membrane was greater than others including Nafion 117 when the membranes were saturated with methanol solution of which concentration was greater than 20%. This fact and that the mechanical properties of the wet crosslinked CS-g-PVA/PVA membrane were comparable to those of other membranes made it a promising material to be used as an electrolyte membrane in a direct methanol fuel cell.

The Influence of Chitosan Membrane Properties for Direct Methanol Fuel Cell Applications

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Peter O. Osifo ◽  
Aluwani Masala
Keyword(s):  
Fuel Cell ◽  
Water Content ◽  
Membrane Resistance ◽  
Membrane Properties ◽  
Methanol Permeability ◽  
Chitosan Membrane ◽  
Nafion Membranes ◽  
Direct Methanol ◽  
Chitosan Membranes ◽  
Methanol Fuel Cell

The chitosan membranes with different degrees of deacetylation (dda), prepared from Cape rock lobster collected from the surroundings of Cape Town, South Africa were characterized for suitability in methanol fuel cell applications. A comparison of chitosan membranes characteristics and that of conventional Nafion 117 membranes were made. Following this, the chitosan membranes were chemically modified with sulfuric acid to improve its proton conductivity and mechanical properties. A mass balance on proton transfer across the membrane resulted in a second order differential equation. Experimental data fitted into the equation gives a linear curve that was used to determine the membrane resistance. It was found that the dda of the chitosan membranes affected the water uptake, thereby affecting the proton flow. At a temperature of 20°C, chitosan membranes with a difference of 10% dda have a difference of about 5% water content. Chitosan membranes with a lower dda were found to have higher water content resulting in lower membrane resistances to proton flow. The water content of chitosan membranes was higher than Nafion membranes. The average resistance to proton flow for chitosan membrane was 53 min/cm and a Nafion membrane was 78 min/cm. Thermogravimetry analysis shows that chitosan membrane with higher dda is more thermally stable than chitosan with lower dda, Nafion membranes were more stable at higher temperature than chitosan membranes, Nafion membranes could decompose at temperature of 320 °C while chitosan membranes at 230 °C. Methanol permeability through chitosan membrane of higher dda was more than with one lower dda, however, the permeability through chitosan was three times lower when compares to Nafion membranes under the same temperature and pressure conditions. The performance of chitosan membranes and Nafion 117 membranes measured from a single cell DMFC with Pt-Ru/C anode catalysts and Pt/C cathode catalysts showed that Nafion membranes have a better performance. This was because the current and peak power densities determined for Nafion membranes were 0.56 A/cm2 and 0.075 W/cm2, respectively, and for Chit-I, were 0.22 A/cm2 and 0.0274 W/cm2, respectively, and for Chit-II membrane, were 0.26 A/cm2 and 0.0424 W/cm2, respectively.

scholarly journals Development of a cross-linked quaternized poly(styrene-b-isobutylene-b-styrene)/graphene oxide composite anion exchange membrane for direct alkaline methanol fuel cell application

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52122-52130 ◽  
Author(s):  
Pei Dai ◽  
Zhao-Hua Mo ◽  
Ri-Wei Xu ◽  
Shu Zhang ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cell ◽  
Ionic Conductivity ◽  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Methanol Permeability ◽  
Oxide Composite ◽  
Fuel Cell Application ◽  
Exchange Membrane ◽  
Methanol Fuel Cell

A crosslinked quaternized poly(styrene-b-isobutylene-b-styrene)/graphene oxide composite anion exchange membrane showed high ionic conductivity and low methanol permeability.

Methanol permeability and proton conductivity of Nafion membranes modified electrochemically with polyaniline

2008 ◽  
Vol 184 (2) ◽  
pp. 338-343 ◽  
Author(s):  
Q.M. Huang ◽  
Q.L. Zhang ◽  
H.L. Huang ◽  
W.S. Li ◽  
Y.J. Huang ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Methanol Permeability ◽  
Nafion Membranes
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