C3ee43683g 682..688

Joint Center for Articial Photosynthes Pasadena, California 91125, USA. E-mail: g Joint Center for Articial Photosynthesis, Berkeley, California 94720, USA Engineering Division, Lawrence Berkeley N 94720, USA Department of Chemical and Biomolecular Berkeley, Berkeley, California 94720, USA † Electronic supplementary information additional electrochemical data, SEM electrolyzer data, comparison of inte compositions. See DOI: 10.1039/c3ee4368 Cite this: Energy Environ. Sci., 2014, 7, 682