A method for measuring interfacial photoelectron transfer and material photocatalytic activity and a four-dimensional microscopic imaging analyzer

Abstract

The invention belongs to the field of analytical chemistry, and in particular relates to a determination method for interfacial photoelectron transfer and material photocatalysis activity, and a four-dimensional microscopy imaging analyzer. The four-dimensional microscopy imaging analyzer comprises a sample target, a laser, a slit, an extraction electrode, a hexapole, a quadrupole, a flying time mass analyzer, a detector and a device for supplying the sample target, slit, extraction electrode and hexapole with voltage. The determination method and four-dimensional microscopy imaging analyzer make use of the tunnel effect that a semiconductor material generates photoinduced electrons under laser illumination and the capture principle of electron acceptor molecules, determine the mass-to-charge ratio and ion signal of the interfacial transfer photoinduced electrons captured by the electron acceptor molecules or a product of photochemical reaction initiated by the interfacial transfer photoinduced electrons captured by the electron acceptor molecules, and obtain the microscopy imaging of a photocatalysis active spot through image reconstruction, thereby judging the photocatalysis active spot of the semiconductor material on the one hand, and judging the difficulty of the electron acceptor molecules in generating photochemical reaction and the product of photochemical reaction on the other hand.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a method for measuring interface photoelectron transfer and material photocatalytic activity and a four-dimensional microscopic imaging analyzer. Background technique [0002] The photoelectron transfer at the heterogeneous interface is a key link in the photocatalytic reaction. The real-time monitoring of the heterogeneous electron transfer process and the determination of the intermediate transition state and reaction products of the photocatalytic reaction play an important role in understanding the conversion of solar energy and the photodegradation of environmental pollutants. At present, the measurement methods of interfacial photoelectron transfer and photocatalytic activity of materials include three categories: (1) Overall mean method, such as surface-enhanced Raman spectroscopy and fluorescence spectroscopy. This method cannot reflect the difference of a ...

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Problems solved by technology

This method cannot reflect the difference of a single photocatalytic active site of the material, and cannot identify unknown photocatalytic reaction products or intermediate products; (2) single-molecule fluorescence spectroscopy, which uses the target products produced by photocatalytic reactions (such as super Oxygen anions) and the fluorescence generated by probe molecules, although high-resolution fluorescence imaging of a single photocatalytic active site can be performed, but unknown photocatalytic reaction products or intermediate products cannot be identified; (3) Scanning electron microanalyzer, which This method requires the sample to be in a high vacuum state, so it cannot reflect the interfacial photoelectron transfer and photocatalytic activity and their changes with time under actual reaction conditions.

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