In Situ Single Particle Reconstruction Reveals 3D Evolution of PtNi Nanocatalysts During Heating.

Autor: Wang YC; Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, China.; Department of Materials, University of Manchester, Manchester, M13 9PL, UK.; School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China., Slater TJA; Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK., Leteba GM; Centre for Materials Engineering, Department of Mechanical Engineering, University of Cape Town, Cape Town, 7700, South Africa., Lang CI; Centre for Materials Engineering, Department of Mechanical Engineering, University of Cape Town, Cape Town, 7700, South Africa., Wang ZL; Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, China.; School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA., Haigh SJ; Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Mar; Vol. 20 (10), pp. e2302426. Date of Electronic Publication: 2023 Oct 31.
DOI: 10.1002/smll.202302426
Abstrakt: Tailoring nanoparticles' composition and morphology is of particular interest for improving their performance for catalysis. A challenge of this approach is that the nanoparticles' optimized initial structure often changes during use. Visualizing the three dimensional (3D) structural transformation in situ is therefore critical, but often prohibitively difficult experimentally. Although electron tomography provides opportunities for 3D imaging, restrictions in the tilt range of in situ holders together with electron dose considerations limit the possibilities for in situ electron tomography studies. Here, an in situ 3D imaging methodology is presented using single particle reconstruction (SPR) that allows 3D reconstruction of nanoparticles with controlled electron dose and without tilting the microscope stage. This in situ SPR methodology is employed to investigate the restructuring and elemental redistribution within a population of PtNi nanoparticles at elevated temperatures. The atomic structure of PtNi is further examined and a heat-induced transition is found from a disordered to an ordered phase. Changes in structure and elemental distribution are linked to a loss of catalytic activity in the oxygen reduction reaction. The in situ SPR methodology employed here can be extended to a wide range of in situ studies employing not only heating, but gaseous, aqueous, or electrochemical environments to reveal in-operando nanoparticle evolution in 3D.
(© 2023 The Authors. Small published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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