title: Discovery of Fe-Ce Oxide/BiVO4 Photoanodes through Combinatorial Exploration of Ni-Fe-Co-Ce Oxide Coatings.
abstract: An efficient photoanode is a prerequisite for a viable solar fuels technology. The challenges to realizing an efficient photoanode include the integration of a semiconductor light absorber and a metal oxide electrocatalyst to optimize corrosion protection, light trapping, hole transport, and photocarrier recombination sites. To efficiently explore metal oxide coatings, we employ a high-throughput methodology wherein a uniform BiVO4 film is coated with 858 unique metal oxide coatings covering a range of metal oxide loadings and the full (Ni-Fe-Co-Ce)Ox pseudoquaternary composition space. Photoelectrochemical characterization of the photoanodes reveals that specific combinations of metal oxide composition and loading provide up to a 13-fold increase in the maximum photoelectrochemical power generation for oxygen evolution in pH 13 electrolyte. Through mining of the high-throughput data we identify composition regions that form improved interfaces with BiVO4. Of particular note, integrated photoanodes with catalyst compositions in the range Fe(0.4-0.6)Ce(0.6-0.4)Ox exhibit high interface quality and excellent photoelectrochemical power conversion. Scaled-up inkjet-printed electrodes and photoanodic electrodeposition of this composition on BiVO4 confirms the discovery and the synthesis-independent interface improvement of (Fe-Ce)Ox coatings on BiVO4.
authors.affiliation: Joint Center for Artificial Photosynthesis, California Institute of Technology ; Pasadena, California 91125, United States.
authors.forename: Aniketa
authors.initials: A
authors.lastname: Shinde
authors.affiliation: Joint Center for Artificial Photosynthesis, California Institute of Technology ; Pasadena, California 91125, United States.
authors.forename: Dan
authors.initials: D
authors.lastname: Guevarra
authors.affiliation: Joint Center for Artificial Photosynthesis & Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Guiji
authors.initials: G
authors.lastname: Liu
authors.affiliation: Joint Center for Artificial Photosynthesis & Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Ian D
authors.initials: ID
authors.lastname: Sharp
authors.affiliation: Joint Center for Artificial Photosynthesis & Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Francesca M
authors.initials: FM
authors.lastname: Toma
authors.affiliation: Joint Center for Artificial Photosynthesis, California Institute of Technology ; Pasadena, California 91125, United States.
authors.forename: John M
authors.initials: JM
authors.lastname: Gregoire
authors.affiliation: Joint Center for Artificial Photosynthesis, California Institute of Technology ; Pasadena, California 91125, United States.
authors.forename: Joel A
authors.initials: JA
authors.lastname: Haber
keywords: high-throughput experimentation; materials integration; oxygen evolution reaction; photoanode; solar fuels