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Title: Effects of metal composition and ratio on peptide-templated multimetallic PdPt nanomaterials

It can be difficult to simultaneously control the size, composition, and morphology of metal nanomaterials under benign aqueous conditions. For this, bioinspired approaches have become increasingly popular due to their ability to stabilize a wide array of metal catalysts under ambient conditions. In this regard, we used the R5 peptide as a three-dimensional template for formation of PdPt bimetallic nanomaterials. Monometallic Pd and Pt nanomaterials have been shown to be highly reactive toward a variety of catalytic processes, but by forming bimetallic species, increased catalytic activity may be realized. The optimal metal-to-metal ratio was determined by varying the Pd:Pt ratio to obtain the largest increase in catalytic activity. To better understand the morphology and the local atomic structure of the materials, the bimetallic PdPt nanomaterials were extensively studied by transmission electron microscopy, extended X-ray absorption fine structure spectroscopy, X-ray photoelectron spectroscopy, and pair distribution function analysis. The resulting PdPt materials were determined to form multicomponent nanostructures where the Pt component demonstrated varying degrees of oxidation based upon the Pd:Pt ratio. To test the catalytic reactivity of the materials, olefin hydrogenation was conducted, which indicated a slight catalytic enhancement for the multicomponent materials. Finally, these results suggest a strong correlation betweenmore » the metal ratio and the stabilizing biotemplate in controlling the final materials morphology, composition, and the interactions between the two metal species.« less
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  1. Univ. of Miami, Coral Gables, FL (United States)
  2. Colorado School of Mines, Golden, CO (United States)
  3. Air Force Research Lab., Wright-Patterson Air Force Base, OH (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Stony Brook Univ., Stony Brook, NY (United States)
  6. Univ. of Miami, Coral Gables, FL (United States); Air Force Research Lab., Wright-Patterson Air Force Base, OH (United States); National Institute of Standards and Technology, Boulder, CO (United States)
Publication Date:
Grant/Contract Number:
Published Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 9; Journal ID: ISSN 1944-8244
American Chemical Society (ACS)
Research Org:
Stony Brook Univ., Stony Brook, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; atomic characterization; bimetallic; catalysis; nanoparticle; peptides; X-ray characterization
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1346401