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Development of solar fuels photoanodes through combinatorial integration of Ni-La-Co-Ce oxide and Ni-Fe-Co-Ce oxide catalysts on BiVO₄

Haber, Joel and Guevarra, Dan and Shinde, Aniketa and Zhou, Lan and Liu, Guiji and Sharp, Ian and Toma, Francesca and Gregoire, John (2016) Development of solar fuels photoanodes through combinatorial integration of Ni-La-Co-Ce oxide and Ni-Fe-Co-Ce oxide catalysts on BiVO₄. In: 20th Annual Green Chemistry & Engineering Conference, 14-16 June 2016, Portland, OR.

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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 BiVO₄ 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 BiVO₄. 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 BiVO₄ 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.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Haber, Joel0000-0001-7847-5506
Guevarra, Dan0000-0002-9592-3195
Shinde, Aniketa0000-0003-2386-3848
Zhou, Lan0000-0002-7052-266X
Liu, Guiji0000-0002-3943-4119
Sharp, Ian0000-0001-5238-7487
Toma, Francesca0000-0003-2332-0798
Gregoire, John0000-0002-2863-5265
Additional Information:© 2016 ECS - The Electrochemical Society.
Record Number:CaltechAUTHORS:20160622-150845222
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68607
Deposited By: Tony Diaz
Deposited On:23 Jun 2016 00:05
Last Modified:26 Apr 2022 17:35

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