1. Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States
2. Future Mobility Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105, United States
3. Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, United States
4. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States