**Contents**


#### **Raja Rafidah R. S., Rashmi W., Khalid M., Wong W. Y. and Priyanka J.** Recent Progress in the Development of Aromatic Polymer-Based Proton Exchange Membranes for Fuel Cell Applications Reprinted from: *Polymers* **2020**, *12*, 1061, doi:10.3390/polym12051061 . . . . . . . . . . . . . . . . **139**
