1. Department
of Geological Sciences, School of Earth, Energy, and Environmental
Sciences, Stanford University, Stanford, California 94305-2115, United States
2. Department
of Energy Resources Engineering, School of Earth, Energy, and Environmental
Sciences, Stanford University, Stanford, California 94305-2220, United States
3. Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
4. Department
of Chemical Engineering, Stanford University, Stanford, California 94305, United States
5. Department
of Photon Science and Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States