The membrane electrode assembly (MEA) is made up of an AEM and anode/cathode electrodes. In this study, membrane Awas used as the AEM for the test. The anode/cathode electrodes consisted of anode/cathode catalyst layers
(Pt/C, 40 wt% Pt, Johnson Mathey) and diffusion layers (Teflon-treated carbon paper, Toray-250). The ionomer solution (5 wt%) was prepared using the OH form membrane A, which was mixed with the catalyst powder and isopropanol to prepare the catalyst ink for the electrode. The ink in which the weight ratio of catalyst to ionomer was 7:3, was stirred continuously for 24 h until the uniform mixturewas obtained. Then the catalyst ink was sprayed onto the Teflon-treated carbon paper to prepare the resulting electrode with an active area of 2.5 2.5 cm2 and a catalyst loading of 1 mg cm2. The AEM sandwiched between the anode and cathode electrodes was hotpressed at 0.5 MPa for 5 min at 60 C to obtain MEA for fuel cell test.