Interpreting Ionic Conductivity for Polymer Electrolyte Fuel Cell Catalyst Layers with Electrochemical Impedance Spectroscopy and Transmission Line Modeling. - Yongzhen Qi; Jiangjin Liu; Sabarirajan, Dinesh C.; Ying Huang; Perego, Andrea; Haug, Andrew T.; Zenyuk, Iryna V. (Journal of The Electrochemical Society, 2021)