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Solid Electrolyte Interphase Formation in Tellurium Iodide Perovskites during Electrochemistry and Photoelectrochemistry.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2023 Aug 02; Vol. 15 (30), pp. 37069-37076. Date of Electronic Publication: 2023 Jul 24. - Publication Year :
- 2023
-
Abstract
- Halide perovskites are promising photoelectrocatalytic materials. Their further development requires understanding of surface processes during electrochemistry. Thin films of tellurium-based vacancy-ordered perovskites with formula A <subscript>2</subscript> TeI <subscript>6</subscript> , A = Cs, methylammonium (MA), were deposited onto transparent conducting substrates using aerosol-assisted chemical vapor deposition. Thin film stability as electrodes and photoelectrodes was tested in dichloromethane containing tetrabutylammonium PF <subscript>6</subscript> (TBAPF <subscript>6</subscript> ). Using photoemission spectroscopy, we show that the formation of a solid electrolyte interphase on the surface of the Cs <subscript>2</subscript> TeI <subscript>6</subscript> , consisting of CsPF <subscript>6</subscript> , enhances the stability of the electrode and allows extended chopped-light chronoamperometry measurements at up to 1.1 V with a photocurrent density of 16 μA/cm <superscript>2</superscript> . In contrast, (CH <subscript>3</subscript> NH <subscript>3</subscript> ) <subscript>2</subscript> TeI <subscript>6</subscript> does not form a passivating layer and rapidly degrades upon identical electrochemical treatment. This demonstrates the importance of surface chemistry in halide perovskite electrochemistry and photoelectrocatalysis.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 15
- Issue :
- 30
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 37486721
- Full Text :
- https://doi.org/10.1021/acsami.3c07425