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A synchrotron radiation in-situ detection device for electrocatalytic reaction

An in-situ detection and electrocatalysis technology, which is applied in measuring devices, material analysis using wave/particle radiation, material analysis by electromagnetic means, etc., can solve the problem that it is difficult to provide real and effective information on the mechanism of catalyst action

Active Publication Date: 2016-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the surface composition and microstructure of the catalyst will change with the reaction atmosphere, temperature and potential, and offline detection and analysis are difficult to provide real and effective information on the mechanism of action of the catalyst.

Method used

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  • A synchrotron radiation in-situ detection device for electrocatalytic reaction
  • A synchrotron radiation in-situ detection device for electrocatalytic reaction
  • A synchrotron radiation in-situ detection device for electrocatalytic reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The X-ray absorption near-edge structure (XANES) spectrum of the cathode PtFe / C catalyst was tested under the working conditions of the proton exchange membrane fuel cell. The electrode was prepared by brush coating method, and then the anode and cathode were placed on both sides of the electrolyte membrane, and the membrane electrode was obtained by hot pressing at 135°C for 3 minutes, wherein the anode was a Pt / C catalyst, and the cathode was a PtFe / C catalyst prepared by an impregnation method. C catalyst, the electrolyte membrane is Naton212. The in-situ cell in the transmission mode is used to detect the signal of iron in the membrane electrode. The assembly process of the in-situ cell is as follows: a serpentine flow field with a width of 1 mm is processed on the side of the anode and cathode flow field plates, and a diameter of 1 mm is processed in the middle of the flow field plate. 2mm round hole. Process a rectangular groove with a size of 1cm×4cm on the othe...

Embodiment 2

[0047] Test XANES spectrum of Fe / C catalyst in carbon dioxide electrolysis cell cathode. The membrane electrode was prepared by the same process as in Example 1, wherein the cathode catalyst was Fe / C catalyst prepared by impregnation method, the anode catalyst was platinum black catalyst, and the electrolyte membrane was sodium Naton117. The in situ cell in fluorescence mode was used to detect the iron signal in the membrane electrode, and the assembly process of the in situ cell was the same as that in Example 1. The anode and cathode of the in-situ cell are respectively fed with NaOH solution with a concentration of 0.5mol / L and NaHCO saturated with carbon dioxide. 3 Solution (concentration is 0.5mol / L), use the heating rod to heat the in-situ cell to 40°C, test the current-voltage curve of the membrane electrode through the potentiostat, and use the circular hole detection window in the middle of the in-situ cell to detect the cathode catalyst Fe From the XANES spectrum, i...

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Abstract

The invention discloses a synchrotron radiation in-situ detection device for electrocatalytic reaction. It consists of a front ionization chamber, a rear ionization chamber (or a fluorescence detector) and an in situ cell of a synchrotron radiation X-ray absorption fine structure spectroscopy (XAFS) line station. By assembling the membrane electrode for the electrocatalytic reaction in the in-situ cell, under the condition that the detection windows of each component in the in-situ cell are on the same center line, X-rays are used to irradiate the membrane electrode, and the X-rays are transmitted or reflected. After arriving at the synchrotron radiation XAFS line station, the ionization chamber or fluorescence detector realizes the in-situ detection of the catalyst structure during the electrocatalytic reaction; the detection window of the in-situ cell is in the center of the flow field plate, and the dead volume is small, which improves the accuracy of the experimental data. Accuracy and reliability; the heating plate and the flow field plate in the in-situ cell are fixed together with screws, which not only realizes the sealing of the detection window on the flow field plate, but also facilitates the assembly and replacement of membrane electrodes. It is a set of detection devices suitable for studying the process and mechanism of electrocatalytic reactions.

Description

technical field [0001] The invention relates to a synchrotron radiation in-situ detection device for electrocatalytic reaction, in particular to a synchrotron radiation in-situ detection device for a proton exchange membrane fuel cell and a carbon dioxide electrolysis cell. Background technique [0002] Catalysts are key materials in electrocatalytic reactions, and their composition and structure directly affect electrocatalytic activity and efficiency. During the electrocatalytic reaction, researchers usually use a potentiostat to obtain current-voltage or AC impedance data to evaluate the activity of the catalyst, and then combine offline X-ray diffraction, X-ray photoelectron spectroscopy and other techniques to characterize the structure and surface of the catalyst. composition to study the structure-activity relationship of the catalyst. In fact, the surface composition and microstructure of the catalyst will change with the reaction atmosphere, temperature and potenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/223G01N27/62
Inventor 汪国雄于良邓德会谭大力潘秀莲包信和
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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