Enhanced Charge Carrier Separation in WO 3 /BiVO 4 Photoanodes Achieved via Light Absorption in the BiVO 4 Layer

Grigioni, Ivan; Polo, Annalisa; Dozzi, Maria Vittoria; Stamplecoskie, Kevin G.; Jara, Danilo H.; Kamat, Prashant V.; Selli, Elena

doi:10.1021/acsaem.2c02597

Title: Enhanced Charge Carrier Separation in WO ₃ /BiVO ₄ Photoanodes Achieved via Light Absorption in the BiVO ₄ Layer

Journal Article · Mon Oct 17 00:00:00 EDT 2022 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.2c02597· OSTI ID:1893208

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Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milano20133, Italy
Department of Chemistry, Queen’s University, Kingston, OntarioK7L 3N6, Canada
Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Avenida Padre Hurtado 750, Viña del Mar7941169, Chile
Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana46556, United States

Photoelectrochemical (PEC) water splitting converts solar light and water into oxygen and energy-rich hydrogen. WO₃/BiVO₄ heterojunction photoanodes perform much better than the separate oxide components, though internal charge recombination undermines their PEC performance when both oxides absorb light. Here we exploit the BiVO₄ layer to sensitize WO₃ to visible light and shield it from direct photoexcitation to overcome this efficiency loss. PEC experiments and ultrafast transient absorption spectroscopy performed by frontside (through BiVO₄) or backside (through WO₃) irradiating photoanodes with different BiVO₄ layer thickness demonstrate that irradiation through BiVO₄ is beneficial for charge separation. Optimized electrodes irradiated through BiVO₄ show 40% higher photocurrent density compared to backside irradiation.

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Research Organization:: Univ. degli Studi di Milano (Italy)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FC02-04ER15533

OSTI ID:: 1893208

Alternate ID(s):: OSTI ID: 1900142

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Vol. 5 Journal Issue: 11; ISSN 2574-0962

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Enhanced Charge Carrier Separation in WO 3 /BiVO 4 Photoanodes Achieved via Light Absorption in the BiVO 4 Layer

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Title: Enhanced Charge Carrier Separation in WO ₃ /BiVO ₄ Photoanodes Achieved via Light Absorption in the BiVO ₄ Layer