1. Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, Blacksburg, Virginia 24061, USA
2. National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, USA
3. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
4. Aviation and Missile Center, U.S. Army Combat Capabilities Development Command, Redstone Arsenal, Alabama 35898, USA