DataVXACS Energy LettersPaper
journal article·2018-11-09Open access

Bi-Containing n-FeWO4 Thin Films Provide the Largest Photovoltage and Highest Stability for a Sub-2 eV Band Gap Photoanode

Lan Zhou, Aniketa Shinde, Santosh K. Suram, Helge S. Stein, Sage R. Bauers, Andriy Zakutayev, Joseph S. DuChene, Guiji Liu, Elizabeth A. Peterson, Jeffrey B. Neaton, John M. Gregoire

ACS Energy Letters· Volume 3· Issue 11
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Abstract

Photoelectrocatalysis of the oxygen evolution reaction remains a primary challenge for development of tandem-absorber solar fuel generators due to the lack of a photoanode with broad solar spectrum utilization, a large photovoltage, and stable operation. Bismuth vanadate with a 2.4–2.5 eV band gap has shown the most promise becauses its photoactivity down to 0.4 V vs RHE is sufficiently low to couple to a lower-gap photocathode for fuel synthesis. Through development of photoanodes based on the FeWO4 structure, in particular, Fe-rich variants with addition of about 6% Bi, we demonstrate the same 0.4 V vs RHE turn-on voltage with a 2 eV band gap metal oxide, enabling a 2-fold increase in the device efficiency limit. Combinatorial exploration of materials composition and processing facilitated synthesis of n-type variants of this typical p-type semiconductor that exhibit much higher photoactivity than previous implementations of FeWO4 in solar photochemistry. The photoanodes are particularly promising for solar fuel applications given their stable operation in acid and base.
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Research context

Electronic materials

OpenAlex topics: Advanced Photocatalysis Techniques · Electrocatalysts for Energy Conversion · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States

Materials Science Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States

Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States

Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Physics, University of California, Berkeley, Berkeley, California 94720, United States

Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Kavli Energy NanoSciences Institute, University of California, Berkeley, Berkeley, California 94720, United States

Funding

Basic Energy Sciences

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