1. Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115
2. National Institute of Standards and Technology, Gaithersburg, Maryland 20899
3. Department of Chemistry, University of Maryland, College Park, Maryland 20742-2115
4. School of Chemical Engineering and Technology, Yeungnam University, Gyeongsangbuk-do, Republic of Korea
5. Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
6. 3M Fuel Cell Components Program, St. Paul, Minnesota 55144
7. Korea Atomic Energy Research Institute, Daejeon, 305353, Republic of Korea