In Situ X-ray Absorption Spectroscopy of LaFeO 3 and LaFeO 3 /LaNiO 3 Thin Films in the Electrocatalytic Oxygen Evolution Reaction.
- Resource Type
- Academic Journal
- Authors
- Che Q; Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.; van den Bosch ICG; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Le PTP; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Lazemi M; Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.; van der Minne E; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Birkhölzer YA; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Nunnenkamp M; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Peerlings MLJ; Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.; Safonova OV; PSI, Villigen CH-5232, Switzerland.; Nachtegaal M; PSI, Villigen CH-5232, Switzerland.; Koster G; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; Baeumer C; MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands.; de Jongh P; Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.; de Groot FMF; Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands.
- Source
- Publisher: American Chemical Society Country of Publication: United States NLM ID: 101299949 Publication Model: eCollection Cited Medium: Print ISSN: 1932-7447 (Print) Linking ISSN: 19327447 NLM ISO Abbreviation: J Phys Chem C Nanomater Interfaces Subsets: PubMed not MEDLINE
- Subject
- Language
- English
- ISSN
- 1932-7447
We study the electrocatalytic oxygen evolution reaction using in situ X-ray absorption spectroscopy (XAS) to track the dynamics of the valence state and the covalence of the metal ions of LaFeO 3 and LaFeO 3 /LaNiO 3 thin films. The active materials are 8 unit cells grown epitaxially on 100 nm conductive La 0.67 Sr 0.33 MnO 3 layers using pulsed laser deposition (PLD). The perovskite layers are supported on monolayer Ca 2 Nb 3 O 10 nanosheet-buffered 100 nm SiN x membranes. The in situ Fe and Ni K-edges XAS spectra were measured from the backside of the SiN x membrane using fluorescence yield detection under electrocatalytic reaction conditions. The XAS spectra show significant spectral changes, which indicate that (1) the metal (co)valencies increase, and (2) the number of 3d electrons remains constant with applied potential. We find that the whole 8 unit cells react to the potential changes, including the buried LaNiO 3 film.
Competing Interests: The authors declare no competing financial interest.
(© 2024 The Authors. Published by American Chemical Society.)