1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
3. Shell Catalysts and Technologies LP, Houston, TX 77082, USA
4. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5. Department of Chemistry, Technical University of Munich, 85748 Garching, Germany
6. TUM.int. Energy Research, 85748 Garching, Germany