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An epitaxial La2CuO4 thin film photocathode for water splitting under visible light.
- Source :
-
Journal of Applied Physics . 7/21/2023, Vol. 134 Issue 3, p1-10. 10p. - Publication Year :
- 2023
-
Abstract
- A semiconductive oxide, La2CuO4 (LCO), was investigated as a potential material to compose photocathode for sunlight-driven hydrogen evolution by splitting water. LCO, despite involving partially filled Cu 3d orbitals, behaves as a semiconductor and absorbs visible light on the bandgap formed by significant Coulomb repulsion between the electronic orbitals. An epitaxial LCO film was grown on a SrRuO3/SrTiO3 (SRO/STO) single-crystal substrate by pulsed laser deposition to obtain a photocathodic specimen for water photo-splitting. An LCO photocathode dressed with a Pt cocatalyst for hydrogen evolution (Pt/LCO/SRO/STO) exhibited a cathodic photocurrent with a density of 0.4 mA cm−2 at 0 VRHE under simulated AM1.5 G sunlight. This photocathode responded to incident light up to 800 nm, which is one of the longest wavelengths so far reported for an oxide photoelectrode. Together with a counter-electrode for oxygen evolution, the Pt/LCO/SRO/STO photocathode generated hydrogen with the expected H2 : O2 = 2 : 1 stoichiometric ratio with a Faradaic efficiency of approximately 80%. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTOCATHODES
*VISIBLE spectra
*THIN films
*PULSED laser deposition
*COPPER
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 134
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 165475746
- Full Text :
- https://doi.org/10.1063/5.0145967