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

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Superoxide-Triggered Luminol Electrochemiluminescence for Detection of Oxygen Vacancy in Oxides.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2019-12-24 , DOI: 10.1021/acs.analchem.9b05156
Jiali Liang ₁ , Qinghong Xu ₁ , Xu Teng _{2,

3} , Weijiang Guan ₁ , Chao Lu ₁

Affiliation

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.

中文翻译：

超氧化物触发的鲁米诺电化学发光用于检测氧化物中的氧空位。

氧空位是氧化物中产生自由基的反应中心。当前，X射线光电子能谱（XPS）成为基于金属离子与晶格氧之间原子序数比的差异分析氧空位的独特光谱工具。在这项工作中，发现随着涂覆在电极上的TiO2样品中氧空位浓度的增加，超氧自由基（O2•-）-鲁米诺电化学发光（ECL）强度呈线性增加。该机理的实验研究表明，氧空位浓度的增加可能会导致O2•-的生成增加，从而导致与O2•相关的鲁米诺ECL信号增加。因此，我们开发了一种快速简单的O2•-鲁米诺ECL平台，用于检测TiO2样品中的氧空位，基于O2•-的产生与氧空位之间的关系。所提出的ECL平台通过并行ECL测量显示出良好的可重复性和稳定性。此外，通过分析不同TiO2样品中Co，Cr，Fe和N掺杂浓度的氧空位浓度，验证了可行性。通过提出的ECL方法获得的氧空位浓度可以与通过常规XPS测量获得的氧空位浓度很好地匹配。我们成功构建的ECL平台将极大地促进氧化物中氧空位检测的发展，并加深对氧空位与自由基之间关系的理解。所提出的ECL平台通过并行ECL测量显示出良好的可重复性和稳定性。此外，通过分析不同TiO2样品中Co，Cr，Fe和N掺杂浓度的氧空位浓度，验证了可行性。通过提出的ECL方法获得的氧空位浓度可以与通过常规XPS测量获得的氧空位浓度很好地匹配。我们成功构建的ECL平台将极大地促进氧化物中氧空位检测的发展，并加深对氧空位与自由基之间关系的理解。所提出的ECL平台通过并行ECL测量显示出良好的可重复性和稳定性。此外，通过分析不同TiO2样品中Co，Cr，Fe和N掺杂浓度的氧空位浓度，验证了可行性。通过提出的ECL方法获得的氧空位浓度可以与通过常规XPS测量获得的氧空位浓度很好地匹配。我们成功构建的ECL平台将极大地促进氧化物中氧空位检测的发展，并加深对氧空位与自由基之间关系的理解。通过提出的ECL方法获得的氧空位浓度可以与通过常规XPS测量获得的氧空位浓度很好地匹配。我们成功构建的ECL平台将极大地促进氧化物中氧空位检测的发展，并加深对氧空位与自由基之间关系的理解。通过提出的ECL方法获得的氧空位浓度可以与通过常规XPS测量获得的氧空位浓度很好地匹配。我们成功构建的ECL平台将极大地促进氧化物中氧空位检测的发展，并加深对氧空位与自由基之间关系的理解。

更新日期：2019-12-25

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