Oxygen Vacancy-Dependent Chemiluminescence: A Facile Approach for Quantifying Oxygen Defects in ZnO.
Oxygen Vacancy-Dependent Chemiluminescence: A Facile Approach for Quantifying Oxygen Defects in ZnO.
复制标题
氧空位依赖的化学发光：一种简单的方法定量ZnO中的氧缺陷。
DOI：
10.1021/acs.analchem.2c00359
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发表时间：
2022-06
影响因子：
7.4
通讯作者：
Jing Lei;Wei Liu;Yan-Bin Jin;Baoxin Li
中科院分区：
文献类型：
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作者：
Jing Lei;Wei Liu;Yan-Bin Jin;Baoxin Li
缺陷工程是提高金属氧化物催化活性的有效策略，表面缺陷的定量表征对金属氧化物催化剂的理解和应用至关重要。本研究发现，含氧空位的ZnO纳米粒子可以触发鲁米诺- h2o2体系发出强烈的化学发光（CL），并且CL的强度与ZnO纳米粒子的氧空位密切相关。通过电子自旋共振谱、x射线光电子能谱（XPS）和氯离子能谱等方法探讨了氯离子反应的机理。氧空位依赖性CL归因于氧空位易于吸附H2O2并进一步将其解离为活性•OH自由基的能力。利用这种氧空位依赖的CL，我们提出了一种定量氧化锌中氧缺陷的方法。与现有的评价技术（XPS和拉曼光谱）相比，该方法具有快速、低成本、易于操作等优点。本研究将CL技术引入材料结构性能评价领域，为ZnO缺陷工程中缺陷函数的探索提供了新的途径。
Defect engineering is an effective strategy to improve the catalytic activity of metal oxides, and quantitative characterization of surface defects is thus vital to the understanding and application of metal oxide catalysts. Herein, we found that ZnO nanoparticles with oxygen vacancy could trigger the luminol-H2O2 system to emit a strong chemiluminescence (CL), and the CL intensity was strongly dependent on the oxygen vacancy of the ZnO nanoparticles. The mechanism of this CL reaction was discussed by means of the electron-spin resonance spectrum, X-ray photoelectron spectrum (XPS), and CL spectrum. The oxygen vacancy-dependent CL was attributed to the ability of the oxygen vacancy to readily adsorb and further dissociate H2O2 into active •OH radicals. Taking advantage of this oxygen vacancy-dependent CL, we presented one method for quantifying the oxygen defects in ZnO. Compared with the current evaluation techniques (XPS and Raman spectroscopy), this CL method is rapid, low-cost, and easy to operate. This work introduces the CL technique into the field of material structure-property evaluation, and provides a new approach for exploring the defect function in ZnO defect engineering.