Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 16, Issue 5, Pages -Publisher
ESG
DOI: 10.20964/2021.05.52
Keywords
2d materials; Ti3C2Tx nano-sheets; anodic oxidation; SnO2-based electrodes; water treatment
Categories
Funding
- ANID [21180182, EQM170103]
- ANID within the project Fondecyt [11180121]
- VID of the Universidad de Chile [UI013/2018]
- FONDEQUIP [EQM 150101]
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The study found that incorporating Ti3C2Tx nano-sheets (MXenes) on SnO2/Ti electrodes can enhance their electro-oxidation catalytic activity for the degradation of methyl red. The MXenes-SnO2/Ti electrodes show better catalytic performance and lower charge transfer resistance compared to pure SnO2/Ti electrodes.
The effects of the incorporation of Ti3C2Tx nano-sheets (MXenes) on the microstructure of SnO2/Ti electrodes and their electro-oxidation catalytic activity for the degradation of methyl red is studied in this work. MXenes-SnO2/Ti electrodes are fabricated by spin-coating followed by a thermal treatment under ambient atmospheric conditions using a solution containing MXene nano-sheets, SnCl2, citric acid and ethylene glycol as precursor. Energy-dispersive X-ray spectroscopy, Raman spectroscopy and Xray diffraction analyses of the MXenes-SnO2/Ti electrodes surface indicate the formation of SnO2-TiO2 films with Ti4+ ions incorporated into the lattice of SnO2 crystals. Cyclic voltammetry curves demonstrate that the oxygen evolution reaction is restrained by the MXenes-SnO2/Ti electrodes, while the methyl red electro-oxidation is enhanced - with kinetics following a pseudo-first-order model compared to the performance of (pure) SnO2/Ti electrodes. These results suggest that oxygen vacancies are formed in the crystal lattice of MXenes-SnO2/Ti electrodes, which act as charge carriers and increase the electrical conductivity of SnO2 as confirmed by the lower charge transfer resistance of MXenes-SnO2/Ti electrodes determined by electrochemical impedance spectroscopy analysis.
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