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Method and characterisation 3.5.8 Mordenite Binding Layer The novelty of this work is to test the effect of different silane coupling agent on the functionality of mordenite by using DMFC as an application. Two novel modified binding layers MEAs were fabricated in the following study. The binding layer was made by mixing 0.036 grams of MPTS-HMOR or GMPTS-HMOR with 0.1215 g of Nafion 117 solution (20 wt%) in 5.0 ml acetone. The mixture was sonicated and stirred for 2 hours. The mixture named MPTS-HMOR and GMPTS-HMOR modified binding layer MEAs and kept ready to be applied on the anode electrodes between the catalyst layer and Nafion 117 membrane via airbrush and tested in DMFC. 3.5.9 Effect of Silane Coupling Agents on Mordenite Surface This experiment was carried out to study the effect of silane coupling agents on the functionalization of mordenite to fabricate modified binding layer for membrane electrode assembly and test in DMFC. Protonated mordenite (H-MOR) was mixed with GMPTS and MPTS coupling agents and named GMPTS-MOR and MPTS-MOR respectively. Each mordenite and its coupling agents (GMPTS or MPTS) were mixed with Nafion solution to modify the anode electrode binding layer. These layers were sprayed on two different MEAs. Before the fabrications of binding layer, the amount of functionalized mordenite (MOR- GMPTS) was varied to obtain the optimum amount of inorganic filler (mordenite) to Nafion. The GMPTS-MOR weight percent to Nafion membrane was varied before reaching the optimum target weight percent. Starting with 5 wt% of functionalized mordenite (GMPTS-MOR) to Nafion solution weight was found too high to obtain higher power density. In addition to the wt% of MOR-GMPTS, the silylation of mordenite could be a function of the silane amount (concentration) added to the mixture. Also, the silylation temperature and pressure could contribute to the zeolite functionality. These parameters can affect the adhesion properties of the hybrid layers which can affect the power density of the fuel cell. Therefore, two experiments were carried out using silane to mordenite powder of weight ratio (1:2) and (1:1). The best ratio of silane to mordenite powder was found (1:1). Sirhan AL-Batty Page 114PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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