CaltechAUTHORS
  A Caltech Library Service

Interface engineering for light-driven water oxidation: unravelling the passivating and catalytic mechanism in BiVO_4 overlayers

Liu, Guiji and Eichhorn, Johanna and Jiang, Chang-Ming and Scott, Mary C. and Hess, Lucas H. and Gregoire, John M. and Haber, Joel A. and Sharp, Ian D. and Toma, Francesca M. (2019) Interface engineering for light-driven water oxidation: unravelling the passivating and catalytic mechanism in BiVO_4 overlayers. Sustainable Energy and Fuels, 3 (1). pp. 127-135. ISSN 2398-4902. https://resolver.caltech.edu/CaltechAUTHORS:20181116-091613557

[img] PDF - Supplemental Material
See Usage Policy.

1779Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20181116-091613557

Abstract

Artificial photosynthetic approaches require the combination of light absorbers interfaced with overlayers that enhance charge transport and collection to perform catalytic reactions. Despite numerous efforts that have coupled various catalysts to light absorbing semiconductors, the optimization of semiconductor/catalyst as well as catalyst/electrolyte interfaces and the identification of the role of the catalyst still remain a key challenge. Herein, we assemble (NiFeCoCe)O_x multi-component overlayers, interfaced with bismuth vanadate photoanodes, and determine the roles of different elements on promoting interfacial charge transfer and catalytic reaction over competitive photocarrier recombination loss processes. Through this understanding, and aided by complementary macroscopic photoelectrochemical measurements and nanoscale atomic force microscopy techniques, a bifunctional (CoFeCe/NiFe)O_x overlayer was rationally engineered. The resulting multi-functional coating yields BiVO_4 photoanodes with almost 100% efficient surface collection of holes under oxygen evolving reaction conditions. The (CoFeCe)O_x component excels at efficient capture and transport of photogenerated holes in BiVO_4 through the availability of redox active states, whereas (NiFe)O_x plays a vital role in reducing charge recombination at the BiVO_4/electrolyte interface. In addition, this study supports the hypothesis that catalytic sites act as electronically active trap states on uncoated BiVO_4 photoanodes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1039/C8SE00473KDOIArticle
http://www.rsc.org/suppdata/c8/se/c8se00473k/c8se00473k1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Jiang, Chang-Ming0000-0001-8327-5760
Gregoire, John M.0000-0002-2863-5265
Haber, Joel A.0000-0001-7847-5506
Sharp, Ian D.0000-0001-5238-7487
Toma, Francesca M.0000-0003-2332-0798
Additional Information:© 2018 The Royal Society of Chemistry. The article was received on 26 Sep 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018. This study is based on work performed at the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. There are no conflicts to declare.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:1
Record Number:CaltechAUTHORS:20181116-091613557
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181116-091613557
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90953
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Nov 2018 18:23
Last Modified:03 Oct 2019 20:30

Repository Staff Only: item control page