Understanding Composition-Dependent Synergy of PtPd Alloy Nanoparticles in Electrocatalytic Oxygen Reduction Reaction

Wu, Jinfang; Shan, Shiyao; Cronk, Hannah; Chang, Fangfang; Kareem, Haval; Zhao, Yinguang; Luo, Jin; Petkov, Valeri; Zhong, Chuan-Jian

doi:10.1021/acs.jpcc.7b03043

Title: Understanding Composition-Dependent Synergy of PtPd Alloy Nanoparticles in Electrocatalytic Oxygen Reduction Reaction

Journal Article · Thu Jun 22 00:00:00 EDT 2017 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.7b03043· OSTI ID:1437488

Wu, Jinfang ^[1]; Shan, Shiyao ^[2]; Cronk, Hannah ^[2]; Chang, Fangfang ^[2]; Kareem, Haval ^[2]; Zhao, Yinguang ^[2]; Luo, Jin ^[2];

^[3];

^[2]

Inn Mongolia Univ., Hohhot (China); State Univ. of New York at Binghamton, NY (United States)
State Univ. of New York at Binghamton, NY (United States)
Central Michigan Univ., Mount Pleasant, MI (United States)

Gaining an insight into the relationship between the bimetallic composition and catalytic activity is essential for the design of nanoalloy catalysts for oxygen reduction reaction. This report describes findings of a study of the composition–activity relationship for PtPd nanoalloy catalysts in oxygen reduction reaction (ORR). Pt_nPd_100-n nanoalloys with different bimetallic compositions are synthesized by wet chemical method. While the size of the Pt₅₀Pd₅₀ nanoparticles is the largest among the nanoparticles with different compositions, the characterization of the nanoalloys using synchrotron high-energy X-ray diffraction (HE-XRD) coupled to atomic pair distribution function (PDF) analysis reveals that the nanoalloy with an atomic Pt:Pd ratio of 50:50 exhibits an intermediate lattice parameter. Electrochemical characterization of the nanoalloys shows a minimum ORR activity at Pt:Pd ratio close to 50:50, whereas a maximum activity is achieved at Pt:Pd ratio close to 10:90. The composition–activity correlation is assessed by theoretical modeling based on DFT calculation of nanoalloy clusters. In addition to showing an electron transfer from PtPd alloy to oxygen upon its adsorption on the nanoalloy, a relatively large energy difference between HOMO for nanoalloy and LUMO for oxygen is revealed for the nanoalloy with an atomic Pt:Pd ratio of 50:50. By analysis of the adsorption of OH species on PtPd (111) surfaces of different compositions, the strongest adsorption energy is observed for Pt₉₆Pd₁₀₅ (Pt:Pd ≈ 50:50) cluster, which is believed to be likely responsible for the reduced activity. Interestingly, the adsorption energy on Pt24Pd177 (Pt:Pd ≈ 10:90) cluster falls in between Pt₉₆Pd₁₀₅ and Pd₂₀₁ clusters, which is believed to be linked to the observation of the highest catalytic activity for the nanoalloy with an atomic Pt:Pd ratio of 10:90. Furthermore, these findings have implications for the design of composition-tunable nanoalloy catalysts for ORR.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; SC0006877; CHE 1566283

OSTI ID:: 1437488

Journal Information:: Journal of Physical Chemistry. C, Vol. 121, Issue 26; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 44 works

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