Direct observation of the chemical transformations in BiVO4 photoanodes upon prolonged light-aging treatments
Arcas, Ramón (Universitat Jaume I. Institute of Advanced Materials)
Cardenas-Morcoso, Drialys (Luxembourg Institute of Science and Technology)
Spadaro, Maria Chiara (Institut Català de Nanociència i Nanotecnologia)
García-Tecedor, Miguel (Institutos Madrileño de Estudios Avanzados)
Mesa, Camilo A. (Universitat Jaume I. Institute of Advanced Materials)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Fabregat-Santiago, Francisco (Universitat Jaume I. Institute of Advanced Materials)
Giménez, Sixto (Universitat Jaume I. Institute of Advanced Materials)
Mas-Marzá, Elena (Universitat Jaume I. Institute of Advanced Materials)

Date:	2022
Abstract:	Exposing BiVO photoanodes to light-aging treatments is known to produce a significant photocurrent enhancement. Until now, the interpretation given to this phenomenon is associated to the formation of oxygen vacancies and little is reported about chemical changes in the material. Herein, the chemical segregation of Bi species toward the surface upon light-aging treatment is demonstrated, which takes place with the concomitant formation of intra-bandgap states associated to the oxygen vacancies. It is further demonstrated that these intra-bandgap states are photoactive and generate photocurrent under infrared excitation. These results highlight the importance of understanding light-induced effects while employing multinary metal oxide photoelectrodes.
Grants:	European Commission 754510 Agencia Estatal de Investigación PID2020-116093RB-C41 Agencia Estatal de Investigación PID2020-116093RB-C43 Agencia Estatal de Investigación RED2018-102459-T Ministerio de Economía y Competitividad ENE2017-85087-C3-1-R Ministerio de Ciencia e Innovación SEV-2017-0706 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017-SGR-327
Note:	Altres ajuts: ICN2 is funded by the CERCA Programme/Generalitat de Catalunya.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Bi segregation ; BiVO4 ; Light-aging treatments ; Oxygen vacancies
Published in:	Solar RRL, Vol. 6, issue 7 (July 2022) , art. 2200132, ISSN 2367-198X

DOI: 10.1002/solr.202200132

7 p, 2.8 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles