DataVXACS Energy LettersPaper
journal article·2024-05-10Open access

Impact of Co–Fe Overlayers on Charge Carrier Dynamics at WO3/BiVO4 Heterojunctions: A Picosecond-to-Second Spectroscopic Analysis

Pierpaolo Vecchi, Federica Ruani, Michele Mazzanti, Quentin R. Loague, Raffaello Mazzaro, Federico Boscherini, Barbara Ventura, Gerald J. Meyer, Nicola Armaroli, Stefano Caramori, Luca Pasquini

ACS Energy Letters· Volume 9· Issue 5
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Source abstract

Abstract

Surface modification with CoFe-based overlayers has been widely studied to improve the performance of WO 3 /BiVO 4 photoanodes for photoelectrochemical water oxidation because such overlayers can increase the photocurrent and shift the onset potential to more favorable values. Herein, we present a transient absorption spectroscopic analysis of WO 3 /BiVO 4 photoanodes coated with cobalt iron oxide or cobalt iron Prussian blue overlayers, designed to establish the underlying mechanisms for these enhancements on the picosecond-to-second time scale. The data reveal that the overlayer suppresses recombination of trapped holes in BiVO 4, with free and trapped electrons, and accepts photogenerated holes. These results show that the observed boost in efficiency for water oxidation can be explained by the dual role of the overlayer in inhibiting charge recombination and enhancing charge extraction.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advanced Photocatalysis Techniques · Transition Metal Oxide Nanomaterials · Chalcogenide Semiconductor Thin Films

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

Affiliations

Department of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna 40127, Italy

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill 27599, North Carolina, United States

Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, Bologna 40129, Italy

Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via Fossato di Mortara 17, Ferrara 44121, Italy

Istituto per la Microelettronica e Microsistemi (IMM), Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, Bologna 40129, Italy

Funding

European Commission · Basic Energy Sciences · H2020 Energy

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