[ { "id": "authors:cg3xa-ydw29", "collection": "authors", "collection_id": "cg3xa-ydw29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180412-155950683", "type": "conference_item", "title": "Development of solar fuels photoanodes through combinatorial integration of multifunctional Fe-Ce oxide coatings on BiVO4 as a function of coating composition, loading, and electrolyte", "author": [ { "family_name": "Haber", "given_name": "Joel", "orcid": "0000-0001-7847-5506", "clpid": "Haber-Joel-A" }, { "family_name": "Guevarra", "given_name": "Dan", "orcid": "0000-0002-9592-3195", "clpid": "Guevarra-Dan-W" }, { "family_name": "Shinde", "given_name": "Aniketa", "orcid": "0000-0003-2386-3848", "clpid": "Shinde-Aniketa-A" }, { "family_name": "Zhou", "given_name": "Lan", "orcid": "0000-0002-7052-266X", "clpid": "Zhou-Lan" }, { "family_name": "Toma", "given_name": "Francesca", "orcid": "0000-0003-2332-0798", "clpid": "Toma-Francesca-M" }, { "family_name": "Gregoire", "given_name": "John", "orcid": "0000-0002-2863-5265", "clpid": "Gregoire-J-M" } ], "abstract": "The development of an efficient, stable photoanode to provide protons and electrons to the (photo)cathode remains a primary\nmaterials challenge in the establishment of a scalable technol. for artificial photosynthesis. The typical photoanode architecture\nconsists of a semiconductor light absorber coated with a metal oxide that serves a combination of functions, including corrosion\nprotection, electrocatalysis, light trapping, hole transport, and elimination of deleterious surface recombination sites. To\nprovide a more efficient exploration of metal oxide coatings for a given light absorber, we introduce a high throughput\nmethodol. wherein a uniform BiVO4 library is coated with multi-metal oxide coatings. This presentation will focus on the\nvariation in performance and photo-response of integrated photoanodes consisting of BiVO4 coated with a sputter deposited\nFe-Ce oxide film as a function of compn. and loading. Parallel photoanode libraries were prepd. and evaluated at pH 13 and pH 9.", "publisher": "Caltech Library", "publication_date": "2018-03" }, { "id": "authors:wk4dt-19q16", "collection": "authors", "collection_id": "wk4dt-19q16", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180502-083014371", "type": "conference_item", "title": "Optical, morphological, and electrochemical multimodal characterization for integrated BiVO4 photoanodes", "author": [ { "family_name": "Liu", "given_name": "Guiji", "orcid": "0000-0002-3943-4119", "clpid": "Liu-Guiji" }, { "family_name": "Eichhorn", "given_name": "Johanna", "orcid": "0000-0003-2413-6079", "clpid": "Eichhorn-Johanna" }, { "family_name": "Haber", "given_name": "Joel", "orcid": "0000-0001-7847-5506", "clpid": "Haber-Joel-A" }, { "family_name": "Gregoire", "given_name": "John", "orcid": "0000-0002-2863-5265", "clpid": "Gregoire-J-M" }, { "family_name": "Sharp", "given_name": "Ian", "orcid": "0000-0001-5238-7487", "clpid": "Sharp-Ian-D" }, { "family_name": "Toma", "given_name": "Francesca Maria", "orcid": "0000-0003-2332-0798", "clpid": "Toma-Francesca-M" } ], "abstract": "Photoelectrochem. water splitting is a promising route for efficient conversion of solar energy to chem. fuel.\nHowever, the development of an efficient photoanode remains the primary materials challenge in the\nestablishment of a scalable technol. for solar water splitting. The typical photoanode architecture consists of a\nsemiconductor light absorber coated with a metal oxide that serves a combination of functions, including\ncorrosion protection, electrocatalysis, light trapping, hole transport, and elimination of deleterious recombination\nsites. In addn., the functional behavior of photocatalytic systems strongly depends on the presence of structural\ndefects and heterogeneity over different length scales. Indeed, charge trapping at interfaces and/or (photo)\ncorrosion processes can affect catalytic performance and selectivity. Here, we show an approach to the\ndiscovery integrated photoanodes based on bismuth vanadate light absorber. Among different photoelectrode\nmaterials, BiVO is one of the most actively investigated oxide semiconductors due to its moderate bandgap,\nfavorable conduction band position, and relatively long photocarrier lifetimes. By use of in situ optical\nspectroscopy and comparisons between the metal oxide coatings and their extrinsic optical and electrocatalytic\nproperties, we present a suite of data-driven discoveries, including the scale-up of compn. regions which form\noptimal interfaces with BiVO . We use photoconductive at. force microscopy to correlate local surface morphol.\nwith generated photocurrent maps at individual grain facets in BiVO . The photocurrent maps resolve the\ncontributions from individual grains with nanometer spatial resoln. This careful anal. allows us to identify charge\ntransfer and loss mechanism at the nanoscale that ultimately contribute to det. the macroscale properties of the\nmaterial.", "publisher": "Caltech Library", "publication_date": "2017-08" }, { "id": "authors:d84gd-nny97", "collection": "authors", "collection_id": "d84gd-nny97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170505-132757377", "type": "conference_item", "title": "Development of solar fuels photoanodes through combinatorial integration of Ni- La-Co-Ce oxide and Ni-Fe-Co-Ce oxide catalysts on BiVO\u2084", "author": [ { "family_name": "Haber", "given_name": "Joel", "orcid": "0000-0001-7847-5506", "clpid": "Haber-Joel-A" }, { "family_name": "Guevarra", "given_name": "Dan", "orcid": "0000-0002-9592-3195", "clpid": "Guevarra-Dan-W" }, { "family_name": "Shinde", "given_name": "Aniketa", "orcid": "0000-0003-2386-3848", "clpid": "Shinde-Aniketa-A" }, { "family_name": "Zhou", "given_name": "Lan", "orcid": "0000-0002-7052-266X", "clpid": "Zhou-Lan" }, { "family_name": "Li", "given_name": "Guo", "clpid": "Li-Guo" }, { "family_name": "Liu", "given_name": "Guiji", "orcid": "0000-0002-3943-4119", "clpid": "Liu-Guiji" }, { "family_name": "Sharp", "given_name": "Ian", "orcid": "0000-0001-5238-7487", "clpid": "Sharp-Ian-D" }, { "family_name": "Neaton", "given_name": "Jeffrey B.", "orcid": "0000-0001-7585-6135", "clpid": "Neaton-Jeffrey-B" }, { "family_name": "Toma", "given_name": "Francesca M.", "orcid": "0000-0003-2332-0798", "clpid": "Toma-Francesca-M" }, { "family_name": "Gregoire", "given_name": "John", "orcid": "0000-0002-2863-5265", "clpid": "Gregoire-J-M" } ], "abstract": "The development of an efficient, stable photoanode provide protons and electrons to the (photo)cathode remains a primary materials challenge in the establishment of a scalable technol. for solar fuels generation. The typical photoanode architecture consists of a semiconductor light absorber coated with a metal oxide that serves a combination of functions, including corrosion protection, electrocatalysis, light trapping, hole transport, and elimination of deleterious recombination sites. To provide a more efficient exploration of metal oxide coatings for a given light absorber, we introduce a high throughput methodol. wherein a uniform BIVO\u2084 library is coated with 858 unique metal oxides covering a range of metal oxide loadings and the full NI-La-Co-Ce oxide or Ni-Fe-Co-Ce oxide psuedo-quaternary compn. spaces. Photoelectrochem. characterization of each photoanode reveals that approx. one third of the coatings lower the photoanode performance while select combinations of metal oxide compn. and loading provide up to a 14-fold increase in the max. photoelectrochem. power generation for oxygen evolution in pH 13 electrolyte. Particular Ce-rich coatings also exhibit an anti-reflection effect that further amplifies the performance, yielding a 20-fold enhancement in power conversion efficiency compared to bare BiVO\u2084. By use of in situ optical spectroscopy and comparisons between the metal oxide coatings and their extrinsic optical and electrocatalytic properties, we present a suite of data-driven discoveries, including compn. regions which form optimal interfaces with BiVO\u2084 and photoanodes that are suitable for integration with a photocathode due to their excellent power conversion and solar transmission efficiencies. The initial high throughput discoveries were extended and validated through follow-up high throughput investigations and conventional photoelectrochem. measurements. The high throughput experimentation and informatics provides a powerful platform for both identifying the pertinent interfaces for further study and discovering high performance photoanodes for incorporation into efficient water splitting devices.", "publisher": "Caltech Library", "publication_date": "2017-04" }, { "id": "authors:cbcq1-11z27", "collection": "authors", "collection_id": "cbcq1-11z27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160622-150845222", "type": "conference_item", "title": "Development of solar fuels photoanodes through combinatorial integration of Ni-La-Co-Ce oxide and Ni-Fe-Co-Ce oxide catalysts on BiVO\u2084", "author": [ { "family_name": "Haber", "given_name": "Joel", "orcid": "0000-0001-7847-5506", "clpid": "Haber-Joel-A" }, { "family_name": "Guevarra", "given_name": "Dan", "orcid": "0000-0002-9592-3195", "clpid": "Guevarra-Dan-W" }, { "family_name": "Shinde", "given_name": "Aniketa", "orcid": "0000-0003-2386-3848", "clpid": "Shinde-Aniketa-A" }, { "family_name": "Zhou", "given_name": "Lan", "orcid": "0000-0002-7052-266X", "clpid": "Zhou-Lan" }, { "family_name": "Liu", "given_name": "Guiji", "orcid": "0000-0002-3943-4119", "clpid": "Liu-Guiji" }, { "family_name": "Sharp", "given_name": "Ian", "orcid": "0000-0001-5238-7487", "clpid": "Sharp-Ian-D" }, { "family_name": "Toma", "given_name": "Francesca", "orcid": "0000-0003-2332-0798", "clpid": "Toma-Francesca-M" }, { "family_name": "Gregoire", "given_name": "John", "orcid": "0000-0002-2863-5265", "clpid": "Gregoire-J-M" } ], "abstract": "The development of an efficient, stable photoanode to provide protons and electrons to the (photo)cathode remains a primary materials challenge in the establishment of a scalable technol. for solar fuels generation. The typical photoanode architecture consists of a semiconductor light absorber coated with a metal oxide that serves a combination of functions, including corrosion protection, electrocatalysis, light trapping, hole transport, and elimination of deleterious recombination sites. To provide a more efficient exploration of metal oxide coatings for a given light absorber, we introduce a high throughput methodol. wherein a uniform BiVO\u2084 library is coated with 858 unique metal oxides covering a range of metal oxide loadings and the full Ni-La-Co-Ce oxide or Ni-Fe-Co-Ce oxide psuedo-quaternary compn. spaces. Photoelectrochem. characterization of each photoanode reveals that approx. one third of the coatings lower the photoanode performance while select combinations of metal oxide compn. and loading provide up to a 14-fold increase in the max. photoelectrochem. power generation for oxygen evolution in pH 13 electrolyte. Particular Ce-rich coatings also exhibit an anti-reflection effect that further amplifies the performance, yielding a 20-fold enhancement in power conversion efficiency compared to bare BiVO\u2084. By use of in situ optical spectroscopy and comparisons between the metal oxide coatings and their extrinsic optical and electrocatalytic properties, we present a suite of data-driven discoveries, including compn. regions which form optimal interfaces with BiVO\u2084 and photoanodes that are suitable for integration with a photocathode due to their excellent power conversion and solar transmission efficiencies. The initial high throughput discoveries were extended and validated through follow-up high throughput investigations and conventional photoelectrochem. measurements. The high throughput experimentation and informatics provides a powerful platform for both identifying the pertinent interfaces for further study and discovering high performance photoanodes for incorporation into efficient water splitting devices.", "publisher": "Caltech Library", "publication_date": "2016-06" } ]