Electrochemical stability and corrosion mechanism of fluorine-doped tin oxide film under cathodic polarization in near neutral electrolyte
Document Type
Article
Publication Date
3-1-2023
Abstract
Commercial fluorine-doped tin oxide (FTO) coated glass slides were subjected to different cathodic potentials for 15 min in 0.2 M Na2SO4 of pH 6.42 to study their electrochemical stability. Results showed that FTO could maintain its electrochemical stability until-1200 mV. However, when it was cathodically polarized from-1600 mV to more negative potentials, band structure positions started to shift upwards, the electrolyte became more acidic and a porous structure appeared on the FTO surface. At-2000 mV, a layer of metallic Sn was seen deposited on the FTO surface, verified by X-ray diffraction and scanning electron microscopy - energy dispersive X-ray spectroscopy. During the cathodic corrosion in near neutral electrolyte, the reduction of SnO2 to Sn in-volves water oxidation as well as hydrogen evolution reaction.
Keywords
Fluorine-doped tin oxide, Electrochemical impedance spectroscopy, Mott-schottky analysis, Cathodic potential
Divisions
PHYSICS
Funders
Ministry of Education, Malaysia (Grant No: FRGS/1/2019/TK07/MMU/03/4),CRUE-CSIC,Elsevier
Publication Title
Thin Solid Films
Volume
768
Publisher
Elsevier Science SA
Publisher Location
PO BOX 564, 1001 LAUSANNE, SWITZERLAND