242.95MHz, relaxation delay: 5s, contact time: 2ms, scans: 1000). Fourier Transform Infrared Spectroscopy (FT-IR) spectra were obtained with an FT-IR-6200 (Jasco Co., Ltd.) spectrophotometer. X-ray Diffraction (XRD) analyses were carried out with RINT2000 (Rigaku Co., Ltd.) using a Cu Ka X-ray source at 40 kV and 40 mA. Differential scanning calorimetry (DSC) was analyzed with Perkin Elmer DSC-7 purchased from PerkinElmer Japan Co., Ltd after incubation of samples at 100% RH for three days. Proton conductivity values were measured using the two-probe alternative current impedance method with a Solartron 1260