ATOMIC DISTRIBUTION OF PtCo/C NANOPARTICLES AS INVESTIGATED BY X-RAY ABSORPTION SPECTROSCOPY
| Main Author: | Budiman, Abdul Hamid; Chemical Engineering Department-University of Indonesia New Campus UI, Depok 16424, Indonesia |
|---|---|
| Other Authors: | UI - Universitas Indonesia |
| Format: | Article application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
BATAN
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| Online Access: |
http://jurnal.batan.go.id/index.php/jsmi/article/view/103 |
Daftar Isi:
- X-Ray Absorption Spectroscopy (XAS) was utilized to deduce the structural parameters that can provide information on atomic distribution and extent of alloying as well as the surface population of bimetallic nanoparticles (NPs). In this study, we focused on PtCo/C NPs treated by CO with various of time. XAS measurement showed that this experiment is related to the Case 3, which is JPt < 100 % and JCo < 100 %, then both Pt and Co atoms are not preferred to be alloyed, and it indicates that a higher extent of Pt/Co atoms prefer only to a lesser extent alloying between Pt and Co atoms. If JCo > JPt, it appears that the core is rich in Pt atoms and shell is rich in Co atoms. On the contrary if JPt > JCo resulting in Co atoms are rich in the core and Pt atoms are rich in the shell. The XAS results reveal that the time of treatment influences the surface population hence the structure of the catalyst. Catalyst treated CO for 0, 3 and 5 hours leads to higher population of Pt on the core and Co was moved to the surface resulting to Pt rich in core Co rich in shell, while treated for 7 and 15 hours leads to higher population of Pt on the shell and Co on the core resulting to Pt rich in shell Co rich in core.Keywords: Atomic distribution, X-Ray Absorption Spectroscopy, Coordination number, Alloy extent