Impact of supporting electrolytes on the stability of TiO2–Ti counter electrode during H2O2 electrogeneration
- Authors: Das R.K.1, Golder A.K.1
-
Affiliations:
- Department of Chemical Engineering
- Issue: Vol 53, No 6 (2017)
- Pages: 570-579
- Section: Article
- URL: https://journals.rcsi.science/1068-3755/article/view/230460
- DOI: https://doi.org/10.3103/S1068375517060047
- ID: 230460
Cite item
Abstract
This work focuses on the role of common supporting electrolytes (SEs) in the electro-chemical inertness of Ti-based materials employed for the anodic (direct) oxidation coupled with H2O2 electro-generation at the graphite cathode for the concurrent decomposition of organic contaminants. SEs are added to boost up the ionic conductivity of solution but a question always remains on the effect of SEs on the stability of anode materials. The use of ClO4− is encouraged in the electro-Fenton process as it does not form complexes with Fe2+/Fe3+; however, it is found that ClO4− corroded the TiO2 coated Ti (TiO2–Ti) anode very fast (>60 min) and, Ti4+ ions formed a yellow color complex (λmax = 380 nm) with H2O2. The influence of Cl–, NO3− and SO 42− was insignificant on the stability of TiO2–Ti. The cell current efficiency of H2O2 formation dropped sharply with in the case of TiO2–Ti anode. The TiO2–Ti corrosion also reduced the mass transfer co-efficient of DO transport from bulk to the cathode surface because of Ti4+ adsorption on graphite.
About the authors
Raj Kumar Das
Department of Chemical Engineering
Email: animes@iitg.ernet.in
India, Assam, Guwahati, 781039
Animes Kumar Golder
Department of Chemical Engineering
Author for correspondence.
Email: animes@iitg.ernet.in
India, Assam, Guwahati, 781039
Supplementary files
