Investigation of the effects of SPEEK and its clay composite membranes on the performance of Direct Borohydride Fuel Cell |
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| Affiliation: | 1. Mechanical Engineering Department, University of Kocaeli, 41380, Kocaeli, Turkey;2. Chemical Engineering Department, University of Kocaeli, 41380, Kocaeli, Turkey;1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China;2. College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing, 400074, China;3. School for Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China;2. Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, PR China;3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, PR China;1. School of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran;2. Fuel Cell Laboratory, Green Research Center, Iran University of Science and Technology, Narmak, Tehran, Iran |
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| Abstract: | In this study, composite cation exchange membranes (CEM) were developed. With the experience from widely studied proton exchange membrane fuel cells (PEMFC), sulfonated polyether ether ketone (SPEEK) was prepared to be a more effective and cheaper ionomer alternative to the industry standard Nafion ®. SPEEK polymer membrane can reach sufficient ionic conductivities but have some mechanical and chemical stability problems (at a high degree of sulfonations (DS)). Therefore, in order to optimize the membrane, composite mixing with a well-known organic/inorganic clays called Cloisite® 15A, Cloisite ® 30B and MMT were used. Test cells for both single-cell and conductivity were designed and constructed. The ionic conductivity cell was different than the ones used in most studies, measuring conductivity in-plane with 4 probes using EIS. The membranes were characterized for their proton conductivity with electrochemical impedance spectroscopy (EIS), for DS with H NMR, water uptake, and fuel cell performance tests. First results showed that the acidic sulfonic groups of SPEEK interacted with organic/inorganic clays and as a result of partial barrier the ionic conductivity was decreased but power densities were increased. SPEEK-Cloisite® 30B composite membrane has given 40 mW/cm2 power density value which is higher than pure SPEEK membrane (35 mW/cm2). The proton conductivities of the final composite membranes were close to bare SPEEK membranes which are 0,065 and 0,075 S/cm for SPEEK-Cloisite ® 30B and pristine SPEEK, respectively. |
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| Keywords: | DBFC Inorganic clays Cation exchange membranes |
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