1. Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
3. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
4. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States