Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 21, Issue 1, Pages 573-583Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14686996.2020.1789437
Keywords
Pd3Ti nanoparticles; Pd3Zr nanoparticles; intermetallic compounds; electro-oxidation; fuel cells
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Funding
- JST PRESTO program
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS) [23560855]
- Grants-in-Aid for Scientific Research [23560855] Funding Source: KAKEN
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Two highly active and stable Pd-based intermetallic nanocrystals with early d-metals Pd3Ti and Pd3Zr have been developed. The nanocrystals are synthesized by co-reduction of the respective salts of Pd and Ti/Zr. Hard X-ray photoemission Spectroscopy (HAXPES) analysis of the nanocrystals indicates that the electronic properties of Pd are modified significantly, as evident from the lowering of the d-band center of Pd. The intermetallic nanocrystals dispersed in Vulcan carbon, Pd3Ti/C and Pd3Zr/C, exhibit improved electrocatalytic activity towards methanol and ethanol oxidation in an alkaline medium (0.5 M KOH), compared to those of commercially available catalysts such as Pd/C, Pt/C, and Pt3Sn/C. In addition, Pd3Ti/C and Pd3Zr/C show significantly higher activity towards the oxidation of formic acid in an acidic medium (0.5 M H2SO4), compared to those of Pd/C and Pt/C. The modification of the d-band center of Pd as a result of the alloying of Pd with the early d-metals Ti and Zr may be responsible for the enhanced catalytic activity.
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