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Results and discussion Table 4-1: Required amount of carbon and catalyst for standard MEA [166] Standard MEA Anode (grams) Cathode (grams) Carbon paper weight 0.2676 0.02025 0.2885 0.0600 0.3485 0.2756 0.02025 0.2975 0.0390 0.3375 Ketjen black ink GDL weight after sintering Catalyst amount Final GDL weight After spraying the required amounts to form the first two layers (GDL and CL), the MEA went through hot pressing, and was kept overnight under hydration before starting the fuel cell test. The MEA was tested in the DMFC at standard parameters. These parameters values were well established by previous work [166] in the group and set as base line for each MEA conditioning. Table 4-2 shows the standard conditioning parameters for MEA’s testing. Table 4-2 Standard fuel cell conditioning operating parameters [166] Fuel cell operating temperature Methanol concentration Methanol feed flow rate Air flow rate Fuel cell air pressure 70°C 1.0 M 5 ml/min 1 L/min 1 barg The fuel cell operating temperature (70°C) was reached using the temperature controller and the open circuit voltage (OCV) was measured by the multi-meter. The fuel cell kept running for 30 minutes at the conditions listed in Table 4-2 to reach steady state (i.e. no change in OVC values, fuel cell temperature, and both anode and cathode Sirhan AL-Batty Page 128PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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