In situ raman microdroplet spectroelectrochemical investigation of CuSCN electrodeposited on different substrates

0542623 - ÚFCH JH 2022 RIV CH eng J - Journal Article
Vlčková Živcová, Zuzana - Bouša, Milan - Velický, Matěj - Frank, Otakar - Kavan, Ladislav
In situ raman microdroplet spectroelectrochemical investigation of CuSCN electrodeposited on different substrates.
Nanomaterials. Roč. 11, č. 5 (2021), č. článku 1256. E-ISSN 2079-4991
R&D Projects: GA MŠMT EF16_026/0008382; GA ČR(CZ) GA18-08959S
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institutional support: RVO:61388955
Keywords : Carbon * CuSCN * Hole-transport material * In situ Raman spectroelectrochemistry
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 5.719, year: 2021
Method of publishing: Open access

Systematic in situ Raman microdroplet spectroelectrochemical (Raman-μSEC) characterization of copper (I) thiocyanate (CuSCN) prepared using electrodeposition from aqueous solution on various substrates (carbon-based, F-doped SnO2) is presented. CuSCN is a promising solid p-type inorganic semiconductor used in perovskite solar cells as a hole-transporting material. SEM characterization reveals that the CuSCN layers are homogenous with a thickness of ca. 550 nm. Raman spectra of dry CuSCN layers show that the SCN− ion is predominantly bonded in the thiocyanate resonant form to copper through its S−end (Cu−S−C≡N). The double-layer capacitance of the CuSCN layers ranges from 0.3 mF/cm2 on the boron-doped diamond to 0.8 mF/cm2 on a glass-like carbon. In situ Raman-μSEC shows that, independently of the substrate type, all Raman vibrations from CuSCN and the substrate completely vanish in the potential range from 0 to −0.3 V vs. Ag/AgCl, caused by the formation of a passivation layer. At positive potentials (+0.5 V vs. Ag/AgCl), the bands corresponding to the CuSCN vibrations change their intensities compared to those in the as-prepared, dry layers. The changes concern mainly the Cu−SCN form, showing the dependence of the related vibrations on the substrate type and thus on the local environment modifying the delocalization on the Cu−S bond.
Permanent Link: http://hdl.handle.net/11104/0320006