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Quantitative Energy-Dispersive X-Ray Analysis of Catalyst Nanoparticles Using a Partial Cross Section Approach
Katherine E MacArthur1, Thomas J A Slater2, Sarah J Haigh2
11Department of Materials,University of Oxford,Parks Road,Oxford OX1 3PH,UK.
Summary
New energy-dispersive X-ray (EDX) detectors enable advanced elemental analysis. A simple method for calculating partial cross sections allows accurate quantification of EDX data, revealing platinum surface enrichment in PtCo catalysts.
Area of Science:
- Materials Science
- Analytical Chemistry
- Microscopy
Background:
- Advancements in energy-dispersive X-ray (EDX) detectors offer higher count rates.
- Quantitative elemental analysis in scanning transmission electron microscopy (STEM) requires robust methodologies.
Purpose of the Study:
- To present a straightforward method for calculating partial cross sections to enhance EDX data quantification.
- To apply this method for analyzing the elemental composition of catalyst nanoparticles.
Main Methods:
- Development of a simplified approach for calculating partial cross sections.
- Application of the method to quantify EDX data from acid-leached PtCo catalyst nanoparticles using STEM.
Main Results:
- The proposed method simplifies the quantification of EDX data.
- Accurate determination of platinum surface enrichment in PtCo catalyst nanoparticles was achieved.
Conclusions:
- The new EDX detector technology, combined with the presented quantification method, offers a powerful tool for elemental analysis.
- This approach facilitates precise characterization of material composition, exemplified by PtCo catalysts.
