Electrochemically Induced Strain Evolution in Pt–Ni Alloy Nanoparticles Observed by Bragg Coherent Diffraction Imaging

Kawaguchi, Tomoya; Komanický, Vladimír; Latyshev, Vitalii; Cha, Wonsuk; Maxey, Evan; Harder, Ross; Ichitsubo, Tetsu; You, Hoydoo

doi:10.1021/acs.nanolett.1c00778

Cited by 21 publications

(23 citation statements)

References 43 publications

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“…Indeed, it is largely accepted that fundamental reactivity descriptors ( e.g. surface strain, chemistry, and/or crystallinity) of Pt-based electrocatalysts measured and tailored ex situ are not necessarily conserved in situ − due to surface reconstruction in the particular environment of the PEMFC cathode on operation. , Indeed, to the best of our knowledge, such in situ and/or operando techniques have never been used to investigate this promising novel class of Pt-REM/C nanoalloys.…”

Section: Introductionmentioning

confidence: 99%

Structure Dynamics of Carbon-Supported Platinum-Neodymium Nanoalloys during the Oxygen Reduction Reaction

et al. 2023

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Platinum-rare earth nanoalloys have been predicted to be promising proton exchange membrane fuel cell (PEMFC) electrocatalysts for the cathodic oxygen reduction reaction (ORR). However, their implementation in PEMFCs is limited by the challenge of their preparation as carbon-supported nanostructures. Consequently, the practical structure–activity–stability trends for this class of nanoalloys remain largely unexplored. Herein, carbon-supported Pt–Nd nanoalloys as ORR electrocatalysts are described. The physical chemistry of selected electrocatalysts was extensively investigated by means of combined ex situ and operando techniques, which reveal the unique structural dynamics of Pt–Nd nanoalloys in a simulated PEMFC cathode environment. The experimental observations, supported by theoretical calculations, indicate that after initial significant structural modification in the early stage of operation, the ORR activity is mediated in the longer term by surface compressive strain rather than charge transfer between Pt and Nd. Such key operando structure–activity–stability relations underpin further optimization of carbon-supported Pt-rare earth nanoalloys as fuel cell cathode catalysts.

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Section: Introductionmentioning

confidence: 99%

Structure Dynamics of Carbon-Supported Platinum-Neodymium Nanoalloys during the Oxygen Reduction Reaction

et al. 2023

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“…Bragg coherent X-ray diffraction imaging (BCDI) allows three-dimensional (3D) nanoscale strain measurements, with a typical spatial resolution of a few tens of nanometres and a strain resolution on the order of ∼2×10 −4 (Hofmann et al, 2017b). BCDI has been applied to study crystal defects and lattice strain in a variety of materials, including noble metals (Robinson et al, 2001), alloys (Kawaguchi et al, 2021), geological compounds (Yuan et al, 2019), semiconductors (Lazarev et al, 2018), and functional materials (Dzhigaev et al, 2021). An advantage of using BCDI is the ability to study 3D volumes up to 1 µm in size at ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Refinements for Bragg coherent X-ray diffraction imaging: Electron backscatter diffraction alignment and strain field computation

Yang¹,

Lapington²,

He³

et al. 2022

Preprint

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Bragg coherent X-ray diffraction imaging (BCDI) allows the three-dimensional (3D) measurement of lattice strain along the scattering vector for specific microcrystals.If at least three linearly independent reflections are measured, the 3D variation of the full lattice strain tensor within the micro-crystal can be recovered. However, this requires knowledge of the crystal orientation, which is typically attained via estimates based on crystal geometry or synchrotron micro-beam Laue measurements. Here, we

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“…10 This is part of the motivation for recently investing in modern nanofocus instruments at most of the world's synchrotrons, [11][12][13][14][15] enabling operando experiments with a variety of nanobeam techniques. [16][17][18][19][20][21] In particular, BCDI has been increasingly applied to problems in heterogeneous catalysis, 22 electrocatalysis, [23][24][25] and complex electrochemical energy conversion systems. [26][27][28][29] The BCDI method requires extremely high flux densities when applied to small and industrially relevant nanoparticles, 30 and the recently constructed 4:th generation synchrotron sources are expected to enable this by providing brighter and higher-quality X-ray beams.…”

Section: Introductionmentioning

confidence: 99%

Chemical limits on X-ray nanobeam studies in water

Björling

Marçal

Arán‐Ais

et al. 2023

Preprint

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Operando X-ray studies of chemical reactions have gained increasing interest lately, fuelled by the emergence of a new generation of powerful focused X-ray sources. Although it is well known that ionizing radiation causes damage to samples via radical chemistry, this effect is often overlooked in studies of working devices or catalysts where intense focused beams are used as nano-scale probes. Here, we show how an X-ray nano-beam directly causes a phase transition in Pd nanoparticles, and that a large oxidative potential must be applied to prevent the process. We present a chemical reaction-diffusion model which offers a plausible qualitative explanation of the observations, and which also suggests that prohibitive concentrations of reactive species will arise under any focused X-ray probe, calling into question the validity of these methods as applied to aqueous chemical and catalytic systems.

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Electrochemically Induced Strain Evolution in Pt–Ni Alloy Nanoparticles Observed by Bragg Coherent Diffraction Imaging

Cited by 21 publications

References 43 publications

Structure Dynamics of Carbon-Supported Platinum-Neodymium Nanoalloys during the Oxygen Reduction Reaction

Structure Dynamics of Carbon-Supported Platinum-Neodymium Nanoalloys during the Oxygen Reduction Reaction

Refinements for Bragg coherent X-ray diffraction imaging: Electron backscatter diffraction alignment and strain field computation

Chemical limits on X-ray nanobeam studies in water

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