Superoxide-Triggered Luminol Electrochemiluminescence for Detection of Oxygen Vacancy in Oxides.

Oxygen vacancy is known to act as a reactive center in oxides to produce radicals. Currently, X-ray photoelectron spectra (XPS) become a unique spectral tool for analyzing oxygen vacancy based on the differences in atomic number ratios between metal ions and lattice oxygen. In this work, it was found that the superoxide radical (O2•–)-luminol electrochemiluminescence (ECL) intensity linearly increases with increasing the oxygen vacancy concentrations of TiO2 samples coated on the electrodes. An experimental study of the mechanism demonstrates that an increase in oxygen vacancy concentrations could lead to an increase in the generation of O2•–, resulting in an increase in the O2•–-related luminol ECL signals. Accordingly, we have developed a rapid and simple O2•–-luminol ECL platform to detect oxygen vacancy in TiO2 samples, based on the relationship between O2•– generation and oxygen vacancy. The proposed ECL platform exhibits good reproducibility and stability through the parallel ECL measurements. Moreo...