Performance of Magnéli phase Ti4O7 and Ti3+ self-doped TiO2 as oxygen vacancy-rich titanium oxide anodes: Comparison in terms of treatment efficiency, anodic degradative pathways, and long-term stability
- Authors
- Kim, Minjeong; Choi, Jaemin; Lee, Woonghee; Ahn, Yong-Yoon; Lee, Hangil; Cho, Kangwoo; Lee, Jaesang
- Issue Date
- Nov-2023
- Publisher
- Elsevier B.V.
- Keywords
- Anodic oxidation; Hydroxyl radical; Long-term stability; Magnéli phases; Ti3+ self-doped TiO2
- Citation
- Applied Catalysis B: Environmental, v.337
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 337
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151550
- DOI
- 10.1016/j.apcatb.2023.122993
- ISSN
- 0926-3373
1873-3883
- Abstract
- This study compared hydrogen annealing and cathodic polarization (producing Magnéli phases and Ti3+ self-doped TiO2, respectively) as strategies to fabricate electrically conducting titanium oxides through oxygen non-stoichiometry creation for anodic water treatment. Electrochemical characterization techniques suggested that Ti4O7 best-suited for redox electrocatalysis among the Magnéli phases exhibited higher electrical conductivity than the self-doped TiO2. This aligned with the superiority of Ti4O7 over the self-doped TiO2 in chlorine evolution and anodic organic oxidation. Hydroxyl radical primarily contributed to anodic oxidation by two conductive titanium oxides at sulfate-based electrolyte, based on the retarding effects of radical scavengers, multi-activity assessment, electron paramagnetic resonance spectral features, and product distribution. Repetitive batch experiments and long-term tests in continuous operation mode demonstrated that self-doped TiO2 underwent more drastic performance reduction than Ti4O7. This accorded with the self-doped TiO2 being more vulnerable to activity loss, chemical alteration, and structural damage during prolonged application. © 2023 Elsevier B.V.
- Files in This Item
-
Go to Link
- Appears in
Collections - 이과대학 > 화학과 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.