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Tuning Oxygen Reduction Reaction Activity via Controllable Dealloying: A Model Study of Ordered Cu3Pt/C Intermetallic Nanocatalysts

Wang, Deli, Yu, Yingchao, Xin, Huolin L., Hovden, Robert, Ercius, Peter, Mundy, Julia A., Chen, Hao, Richard, Jonah H., Muller, David A., DiSalvo, Francis J., Abruña, Héctor D.·2012·Nano Letters
DOI 10.1021/nl302404g
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Abstract

A promising electrocatalyst prototype of low Pt mole fraction, intermetallic nanoparticles of Cu(3)Pt, has been prepared using a simple impregnation-reduction method, followed by a post heat-treatment. Two dealloying methods (electrochemical and chemical) were implemented to control the atomic-level morphology and improve performance for the oxygen reduction reaction (ORR). The morphology and elemental composition of the dealloyed nanoparticles were characterized at angstrom resolution using an aberration-corrected scanning transmission electron microscope equipped with an electron energy loss spectrometer. We found that the electrochemical dealloying method led to the formation of a thin Pt skin of ca. 1 nm in thickness with an ordered Cu(3)Pt core structure, while chemical leaching gave rise to a "spongy" structure with no ordered structure being preserved. A three-dimensional tomographic reconstruction indicated that numerous voids were formed in the chemically dealloyed nanoparticles. Both dealloying methods yielded enhanced specific and mass activities toward the ORR and higher stability relative to Pt/C. The spongy nanoparticles exhibited better mass activity with a slightly lower specific activity than the electrochemically dealloyed nanoparticles after 50 potential cycles. In both cases, the mass activity was still enhanced after 5000 potential cycles.

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Metadata

Authors
Wang, D., Yu, Y., Xin, H. L., Hovden, R., Ercius, P., Mundy, J. A., Chen, H., Richard, J. H., Muller, D. A., DiSalvo, F. J., & Abruña, H. D.
Venue
Nano Letters
Publisher
American Chemical Society (ACS)
Published
2012-09-10
Volume
12
Issue
10
Pages
5230-5238
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
DOI
10.1021/nl302404g
OpenAlex
W2023500763
Cited by
310
References
9
FWCI
9.96
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Tuning Oxygen Reduction Reaction Activity via Controllable Dealloying: A Model Study of Ordered Cu3Pt/C Intermetallic Nanocatalysts. https://app.cochat.ai/papers/10.1021/nl302404g
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Wang, D., Yu, Y., Xin, H. L., Hovden, R., Ercius, P., Mundy, J. A., Chen, H., Richard, J. H., Muller, D. A., DiSalvo, F. J., & Abruña, H. D. (2012). Tuning Oxygen Reduction Reaction Activity via Controllable Dealloying: A Model Study of Ordered Cu3Pt/C Intermetallic Nanocatalysts. Nano Letters. https://doi.org/10.1021/nl302404g

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