Study on redox process of Pt catalyst for fuel cell
Inquiry number
SOL-0000000889
Beamline
BL28B2 (White Beam X-ray Diffraction)
Scientific keywords
| A. Sample category | inorganic material |
|---|---|
| B. Sample category (detail) | metal, alloy |
| C. Technique | absorption and its secondary process |
| D. Technique (detail) | XAFS, EXAFS, XANES |
| E. Particular condition | time-resolved (slow), time-resolved (ms) |
| F. Photon energy | X-ray (4-40 keV) |
| G. Target information | chemical state, local structure, electronic state |
Industrial keywords
| level 1---Application area | cell (battery) |
|---|---|
| level 2---Target | fuel cell, catalysis |
| level 3---Target (detail) | electric rod |
| level 4---Obtainable information | local structure, electronic state |
| level 5---Technique | XAFS |
Classification
A80.34 catalysis, A80.42 energy, resource, M40.10 XAFS
Body text
In this solution, Time-resolved XAFS measurement was applied to Pt catalyst for fuel cell during reduction and oxidation process to analyze local structural changes of Pt with a time resolution of 900 miliseconds. DXAFS is a powerful tool for studying dynamic structural changes of materials during chemical reactions. Using this technique, it becomes possible to obtain XAFS spectrum with time resolution of less than 1 second.These data reveal the fact that the surface of the Pt particle is reconstructed in the oxidation process and Pt oxide is removed in the reduction process.
Figure. Time dependence of k3-wighted Fourier Transforms for Pt L3EXAFS in an oxidation process.
Source of the figure
Original paper/Journal article
Journal title
電気化学会72回大会予稿集
Figure No.
1
Technique
Energy dispersive XAFS (DXAFS) is a powerful technique to study of dynamic structural changes of materials. The technique is applicable to materials during chemical or physical reactions and provides knowledge about a reaction intermediate and the generation process of materials.
Source of the figure
No figure
Required time for experimental setup
1 shift(s)
Instruments
| Instrument | Purpose | Performance |
|---|---|---|
| Energy-dispersive XAFS | Time resoived XAFS measurement | energy region:7-40keV, time resolution:tens of milliseconds to seconds |
References
| Document name |
|---|
| 電気化学会第72回大会予稿集 |
Related experimental techniques
Questionnaire
This solution is an application of a main instrument of the beamline.
With user's own instruments.
Ease of measurement
Middle
Ease of analysis
Middle
How many shifts were needed for taking whole data in the figure?
Less than one shift