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

Publication Title

Thin Solid Films

Divisions

PHYSICS

Funders

Ministry of Education, Malaysia (Grant No: FRGS/1/2019/TK07/MMU/03/4),CRUE-CSIC,Elsevier

Volume

768

Publisher

Elsevier Science SA

Publisher Location

PO BOX 564, 1001 LAUSANNE, SWITZERLAND

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