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

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

doi:10.1021/acsenergylett.8b01514

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

Journal Article · Fri Oct 12 00:00:00 EDT 2018 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.8b01514· OSTI ID:1484434

Zhou, Lan ^[1];

^[1]; Suram, Santosh K. ^[1]; Stein, Helge S. ^[1]; Bauers, Sage R. ^[2];

^[2];

^[1]; Liu, Guiji ^[3]; Peterson, Elizabeth A. ^[4]; Neaton, Jeffrey B. ^[4];

^[1]

California Inst. of Technology (CalTech), Pasadena, CA (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Here, we reort that 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. Lastly, the photoanodes are particularly promising for solar fuel applications given their stable operation in acid and base.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD); National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308; SC0004993; AC02-05CH11231

OSTI ID:: 1484434

Report Number(s):: NREL/JA-5K00-72583

Journal Information:: ACS Energy Letters, Vol. 3, Issue 11; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Rational Design of a Coupled Confronting Z‐Scheme System Toward Photocatalytic Refractory Pollutant Degradation and Water Splitting Reaction Kandi, Debasmita; Sahoo, Dipti Prava; Martha, Satyabadi Advanced Materials Interfaces, Vol. 6, Issue 17 https://doi.org/10.1002/admi.201900370	journal	July 2019
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Title: Bi-Containing n-FeWO4 Thin Films Provide the Largest Photovoltage and Highest Stability for a Sub-2 eV Band Gap Photoanode

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