TY - JOUR
T1 - Novel composite proton-exchange membrane based on silica-anchored sulfonic acid (SASA)
AU - Duvdevani, T.
AU - Philosoph, M.
AU - Rakhman, M.
AU - Golodnitsky, D.
AU - Peled, E.
N1 - Funding Information:
This work was partially supported by the European Commission Research Directorate-General Contract N° ENK6-CT-2000-00315.
PY - 2006/10/27
Y1 - 2006/10/27
N2 - A new approach to the synthesis of a low-cost proton-exchange composite membrane (C-PEM) based on PVDF and silica with surface-anchored sulfonic acid (SASA) groups, is presented for the first time. SASA membranes of different compositions have been prepared and characterized with the use of SEM, DSC, TGA, BET and electrochemical techniques. The room-temperature conductivity of SASA-based C-PEMs, is in the range of 2.0-50 mS cm-1. The equivalent weight of two SASA powders, SASA3(A) and SASA4(A) are 1600 and 2500 g equiv.-1 respectively. The typical pore size as measured by BET is about 4 nm. The membrane is thermally stable up to 250 °C. Direct methanol fuel cells (DMFCs) have been assembled with some of the membranes. Preliminary tests show that the cell resistance with a non-optimized membrane is in the range of 3 Ω cm-2, therefore the maximum cell power density achieved so far does not exceed 32 mW cm-2 at 70 °C. The crossover-current density for a 100 μm-thick membrane DMFC measured in 1 M methanol at 80 °C is 110 mA cm-2.
AB - A new approach to the synthesis of a low-cost proton-exchange composite membrane (C-PEM) based on PVDF and silica with surface-anchored sulfonic acid (SASA) groups, is presented for the first time. SASA membranes of different compositions have been prepared and characterized with the use of SEM, DSC, TGA, BET and electrochemical techniques. The room-temperature conductivity of SASA-based C-PEMs, is in the range of 2.0-50 mS cm-1. The equivalent weight of two SASA powders, SASA3(A) and SASA4(A) are 1600 and 2500 g equiv.-1 respectively. The typical pore size as measured by BET is about 4 nm. The membrane is thermally stable up to 250 °C. Direct methanol fuel cells (DMFCs) have been assembled with some of the membranes. Preliminary tests show that the cell resistance with a non-optimized membrane is in the range of 3 Ω cm-2, therefore the maximum cell power density achieved so far does not exceed 32 mW cm-2 at 70 °C. The crossover-current density for a 100 μm-thick membrane DMFC measured in 1 M methanol at 80 °C is 110 mA cm-2.
KW - Fuel cell
KW - Membrane
KW - Methanol oxidation
KW - PCM
KW - SASA
UR - http://www.scopus.com/inward/record.url?scp=33750941906&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2006.06.006
DO - 10.1016/j.jpowsour.2006.06.006
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AN - SCOPUS:33750941906
SN - 0378-7753
VL - 161
SP - 1069
EP - 1075
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 2
ER -
