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. Moreover, the feasibility is
verified by analyzing the oxygen vacancy concentrations in different
TiO2 samples with varying the Co, Cr, Fe, and N doping
concentrations. The oxygen vacancy concentrations obtained by the
proposed ECL method could match well with those obtained by conventional
XPS measurements. Our successful construction of the ECL platform
will significantly promote the development of the oxygen vacancy detection
in oxides and deepen the understanding of the relationship between
oxygen vacancy and radicals.
In this study, we discovered that a clear decrease in the electrochemiluminescence (ECL) intensities of luminol occurred upon increasing the electron donating capacity of amides.
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