Electrochemical Peroxodisulfate (PDS) Generation on a Self-Doped TiO2 Nanotube Array Electrode
- Jiye KimJiye KimSchool of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process, Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of KoreaMore by Jiye Kim,
- Changha Lee , and
- Jeyong Yoon*Jeyong Yoon*Phone: +82-2-880-8941. Fax: +82-2-876-8911. E-mail: [email protected]School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process, Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of KoreaAsian Institute for Energy, Environment & Sustainability (AIEES), Seoul National University (SNU), Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of KoreaMore by Jeyong Yoon
Peroxodisulfate (PDS, S2O82–) is one of the strong oxidants (E°[S2O82–/HSO4–] = 2.12 VNHE), which is widely used for radical polymerization or wastewater treatment. In electrochemical PDS generation, its efficiency highly depends on the •OH generating electrode materials. A boron-doped diamond (BDD) used in electrochemical PDS generation is very expensive prompting the need for new electrode materials for PDS generation. This study reports the self-doped TiO2 nanotube array electrodes (blue and black TNAs) for PDS generation which are cheap and effective for generating a significant amount of •OH and comparable to BDD electrodes. Blue and black TNA electrodes were excellent for PDS generation exhibiting high current efficiencies for PDS generation (46% and 22%, respectively). Similar to the BDD electrode, it was also confirmed that •OH was the key precursor to the PDS generation on the self-doped TNA electrodes from the linear relationship between the PDS generation rate and •OH generation.
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