Yolk@Shell Bimetallic Nanomaterials Synthesis Creating Bifunctional Catalysts – a Proof-of-Concept Study

Tuesday, 3 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
F. Fink (Freiburger Materialforschungszentrum, University Freiburg), A. Guiet (Université du Maine, Institut des Molécules et Matériaux), and A. Fischer (Freiburger Materialforschungszentrum, University Freiburg)
Advancements in fuel cell catalyst research aim to develop new catalysts with enhanced durability whilst maintaining mass activity properties. Our recently reported approach called Hydrophobic Nanoreactor Templating (HNT) features a one-pot synthesis of so-called yolk@shell materials consisting of metal nano particles (NP) inside a porous metal oxide support shell. [1]

Hydrophobic Nanoreactor Templating allows to easily synthesize different nanostructures, from open porous structures [2] to Metal Nano Particle (NP)@Metal Oxide (MOx) yolk@shell hollow spheres [1, 3]. HNT allows us to control the metallic NP size and number inside the MOx

In this work, we demonstrate that HNT also allows the synthesis of bifunctional catalysts, with two different types of metal NPs in adjacent metal oxide hollow spheres, thereby tuning HNT to a point where we are able to create Metal1@Pore1 and Metal2@Pore2 nanomaterials in a one-pot fashion, which was so far not possible in the field of porous material synthesis.

This achievement is shown by a Proof-of-Concept study, in which we successfully synthesized Au@MOx-Shell1/Pt@MOx-Shell2 in one material. We were able to tune the Au:Pt-ratios and overall material composition. Material formation and properties have been verified by Scanning Transmission Electron Microscopy (STEM), Energy-dispersive X-ray spectroscopy (EDX) and X-ray Diffraction (XRD) as well as cyclovoltammetry, which will be discussed in detail.

[1] A. Guiet, C. Göbel, K. Klingan, M. Lublow, T. Reier, U. Vainio, R. Kraehnert, H. Schlaad, P. Strasser, I. Zaharieva, H. Dau, M. Driess, J. Polte, and A. Fischer, “Hydrophobic Nanoreactor Soft-Templating: A Supramolecular Approach to Yolk@Shell Materials,”

[2] A. Guiet, T. Reier, N. Heidary, D. Felkel, B. Johnson, U. Vainio, Y. Aksu, M. Driess, P. Strasser, A. Thomas, J. Polte, and A. Fischer, “A one-pot approach to mesoporous metal oxide ultrathin film electrodes bearing one metal nanoparticle per pore with enhanced electrocatalytic properties A one-pot approach to mesoporous metal oxide ultrathin film electrodes bearing one metal nanop,”

[3] A. Guiet, T. Unmüssig, C. Göbel, U. Vainio, M. Wollgarten, M. Driess, H. Schlaad, J. Polte, and A. Fischer, “Yolk@Shell Nanoarchitectures with Bimetallic Nanocores-Synthesis and Electrocatalytic Applications,”