[1] Univ Calif Davis, Dept Chem, One Shields Ave, Davis, CA 95616 USA
[2] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
[3] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
[4] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
[5] Stanford Univ, Precourt Inst Energy, Stanford, CA 94305 USA
[6] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA