Achieving Highly Durable Random Alloy Nanocatalysts through Intermetallic Cores

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Gamler JT, Leonardi A, Ashberry HM, Daanen NN, Losovyj Y, Unocic RR, Engel M, Skrabalak SE
Zeitschrift: ACS nano
Jahr der Veröffentlichung: 2019
Band: 13
Heftnummer: 4
Seitenbereich: 4008-4017
ISSN: 1936-0851
eISSN: 1936-086X


Abstract

Pt catalysts are widely studied for the oxygen reduction reaction, but their cost and susceptibility to poisoning limit their use. A strategy to address both problems is to incorporate a second transition metal to form a bimetallic alloy; however, the durability of such catalysts can be hampered by leaching of non-noble metal components. Here, we show that random alloyed surfaces can be stabilized to achieve high durability by depositing the alloyed phase on top of intermetallic seeds using a model system with PdCu cores and PtCu shells. Specifically, random alloyed PtCu shells were deposited on PdCu seeds that were either the atomically random face-centered cubic phase (FCC A1, Fm3m) or the atomically ordered CsCl-like phase (B2, Pm3m). Precise control over crystallite size, particle shape, and composition allowed for comparison of these two core@shell PdCu@PtCu catalysts and the effects of the core phase on electrocatalytic durability. Indeed, the nanocatalyst with the intermetallic core saw only an 18% decrease in activity after stability testing (and minimal Cu leaching), whereas the nanocatalyst with the random alloy core saw a 58% decrease (and greater Cu leaching). The origin of this enhanced durability was probed by classical molecular dynamics simulations of model catalysts, with good agreement between model and experiment. Although many random alloy and intermetallic nanocatalysts have been evaluated, this study directly compares random alloy and intermetallic cores for electrocatalysis with the enhanced durability achieved with the intermetallic cores likely general to other core@shell nanocatalysts.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Engel, Michael Prof. Dr.
Lehrstuhl für Multiscale Simulation of Particulate Systems
Leonardi, Alberto Dr.
Lehrstuhl für Multiscale Simulation of Particulate Systems


Einrichtungen weiterer Autorinnen und Autoren

Indiana University
Oak Ridge National Laboratory


Zitierweisen

APA:
Gamler, J.T., Leonardi, A., Ashberry, H.M., Daanen, N.N., Losovyj, Y., Unocic, R.R.,... Skrabalak, S.E. (2019). Achieving Highly Durable Random Alloy Nanocatalysts through Intermetallic Cores. ACS nano, 13(4), 4008-4017. https://dx.doi.org/10.1021/acsnano.8b08007

MLA:
Gamler, Jocelyn T.L., et al. "Achieving Highly Durable Random Alloy Nanocatalysts through Intermetallic Cores." ACS nano 13.4 (2019): 4008-4017.

BibTeX: 

Zuletzt aktualisiert 2019-17-05 um 14:08