Aqueous ozone is a strong oxidant to be widely deployed in advanced oxidation processes for water treatment. Electrochemical six-electron water oxidation reaction (6e-WOR) can be a lower-energy alternative to the existing corona discharge for ozone generation. Ni-Sb-SnO2 (NSS) has been a representative ozone evolution reaction (OZER) electrocatalyst whose practical use is yet limited due to low efficiency. In particular, it is challenging to foster selective OZER in competition with thermodynamically favored oxygen evolution reaction (OER). This presentation shows our recent achievement to intensify the OZER based water treatment. First, the mechanism of OZER was revisited by experimental and theoretical approaches. Second, the OZER selectivity could be tuned by overcoating various metal oxides on NSS. The heterojunction NSS/SiOx anode with a proper surface charge density showed 2.7-fold increase in current efficiency. Third, the OZER anode was combined with UV or H2O2 generating cathode to degrade recalcitrant pollutants by OH radicals within E-UV/O3 or E-peroxone process.

Electrochemical ozone generation reaction (OZER) for water treatment

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