1. Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
2. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
3. Environmental TEM Catalysis Consortium (ECC), University of Pittsburgh, Pittsburgh, PA 15261, USA
4. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87123, USA
5. Department of Physics, University of Washington, Seattle, WA 98195, USA
6. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA
7. National Energy Technology Laboratory, Pittsburgh, PA 15236, USA
8. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15261, USA