The ink in which the weight ratio of catalyst to ionomer was 7:3, was stirred continuously for 24 h until the uniform mixture was 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.