1. Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario M5S 3G8, Canada
2. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada
3. Joint Center for Artificial Photosynthesis and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States