Abstract
Boron-doped diamond (BDD) electrodes have a wide potential window and can produce ozone by water electrolysis at high voltage. Though ozone has strong oxidative power (standard oxidation potential: 2.07 V vs. NHE), it cannot decompose certain types of recalcitrant organic matter completely. We developed an advanced oxidation process (AOP), in which hydroxy radicals with stronger oxidative power (standard oxidation potential: 2.85 V vs. NHE) are formed using a combination of ozone, photocatalyst, and UV. In this study, we fabricated a mesoporous TiO2/BDD hybrid electrode and examined its potential for AOPs. A synergetic effect between electrochemical water treatment and photocatalytic water treatment was observed with the hybrid electrode that did not occur with the BDD electrode.
Highlights
Boron-doped diamond (BDD) electrodes have a wide potential window, and low background current, and physical/chemical stability.[1]
To prevent reduction by hydrogen gas resulting from the electrolysis of water, an H-type cell consisting of two separate glass half-cells was used and the mesoporous TiO2/BDD hybrid electrode and Pt were placed in different half-cells
O3 gas was produced by the electrolysis of water, and dissolved O3 gas formed H2O2 through a chain reaction
Summary
Boron-doped diamond (BDD) electrodes have a wide potential window, and low background current, and physical/chemical stability.[1]. Paper et al synthesized a TiO2/Sb-doped SnO2/BDD hybrid electrode with a double-layer three-dimensional macro–mesoporous structure This hybrid electrode showed superior water treatment performance when it was used as a photoanode because of the accumulation of photogenerated holes on the surface under a strong positive potential.[7] the voltage applied to this hybrid electrode was not high enough to produce O3 by water electrolysis. It seems that the potential of this hybrid electrode has not been fully explored.
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