In-situ oxidation reaction of high-entropy alloys for catalytic applications

Catalysts play important role in facilitating reaction in many industrial applications. A research team from the University of Illinois, Chicago (UIC), Argonne National Laboratory (ANL), University of Pittsburgh, University of California, Riverside, and the University of Maryland, College Park used Hummingbird Gas TEM holder to evaluate the performance of highly stable alloy nanoparticles (NPs) –  (Fe0.28Co0.21Ni0.20Cu0.08Pt0.23) while oxidizing in an atmospheric pressure environment at 400 °C. They found slow oxidation behavior in alloy NPs compared to monometallic NPs. The results are published in ACS Nano.

The in-situ TEM data shows an outward diffusion of transition metals in the alloy NPs, The metals form oxide crystals in an overall disordered matrix suggesting that the oxidation drives surface segregation of Fe, Co, Ni, Cu while Pt remains in the core region.  The work presented here provides fundamental insights into the new class of alloy NPs for catalytic applications.

In-situ TEM gas annealing of high-entropy alloy nanocatalyst in air. Oxide thickness around the particles can be observed to increase as a function of time. Copyright © 2021
American Chemical Society

Reference: Boao Song, Yong Yang, Muztoba Rabbani, Timothy T. Yang, Kun He, Xiaobing Hu, Yifei Yuan, Pankaj Ghildiyal, Vinayak P. Dravid, Michael R. Zachariah, Wissam A. Saidi, Yuzi Liu, and Reza Shahbazian-Yassar. In Situ Oxidation Studies of High-Entropy Alloy Nanoparticles,  ACS Nano (2020). Full paper


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