1. Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
2. Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, Washington 99352, United States
3. Center for Fuel Cell Innovation, School of Material Science and Engineering, State Key Lab of Material Processing and Die & Mold Technology, Huazhong University of Science and Technology, Wuhan 430074, China
4. Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States