Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 12, Pages 4270-4275Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14705c
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Funding
- National Science Council of Taiwan [102-2221-E-008-030, 102-2120-M-007-007]
- Ministry of Economics Affairs, Taiwan
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In this study, we have investigated the effect of alloying on the modification of the d-band vacancies and oxygen reduction reaction (ORR) activity of PtPd and PtCu nanorods (NRs). PtCu and PtPd NRs with various ratios can be prepared successfully by a facile formic acid reduction method. The number of unfilled d-states (H-Ts) value of Pt nanoparticles is decreased due to the formation of NRs, and further decreased due to the alloying with different metals. For the Pt3Pd NRs, the H-Ts value is as low as 0.3056, suggesting that they have lower unfilled Pt d-states, and more d-band electrons transfer from Pd to Pt, leading to higher ORR activities than Pt/C. Besides, the electron transfer number (n) of Pt3Pd NRs towards the ORR is 3.7, meaning that they complete the O-2 reduction to water and exhibit low hydrogen peroxide production during the ORR. As a result, the correlation between the H-Ts and ORR performance of PtPd and PtCu NRs highlights that the one-dimensional (1-D) structure and the electronic modification effect from Pd to Pt result in the excellent ORR activity and durability of Pt3Pd NRs synergistically.
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