Environmental transmission electron microscopy for catalyst materials using a spherical aberration corrector

Takeda, Seiji; Kuwauchi, Yasufumi; Yoshida, Hideto

doi:10.1016/j.ultramic.2014.11.017

Cited by 48 publications

(30 citation statements)

References 120 publications

(201 reference statements)

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“…In general, Pt N are expected to form equilibrium morphologies that obey Winterbottom constructions, which minimize structural free energy including the particle–substrate interface . The dynamic conditions of a reducing atmosphere and molecular adsorption/dissociation/desorption at elevated temperature will lead to some particle “remodeling” . In the case of STO N , the support–particle interactions stabilize a particular construction, whereas alumina does not stabilize Pt N greatly.…”

Section: Introductionsupporting

confidence: 58%

“…[37][38][39] The dynamic conditions of ar educing atmosphere and molecular adsorption/dissociation/desorption at elevated temperature will lead to some particle"remodeling". [40][41][42] In the case of STO N ,t he support-particle interactions stabilize ap articularc onstruction, whereas alumina does not stabilize Pt N greatly.T he destabilized Pt N on alumina are much closer to free-standingo rv acuum Pt particles and are susceptible to sintering.…”

Section: Atomiclayer Depositionmethodology and Pt N /Ba X Sr 1àx Tio mentioning

confidence: 99%

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Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids

et al. 2018

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The structure sensitivity of Pt nanoparticles (PtN) for gas‐phase acrolein (AC) hydrogenation was probed for PtN on BaxSr1−xTiO3 nanocuboid supports with (0 0 1) facets in a combined theoretical and experimental study. The in situ selectivity for allyl alcohol increased with the increase of the Sr concentration in the support, which corresponds to modifications in the stable Winterbottom shape and lattice strain of the Pt nanoparticles as a result of the interfacial energy between Pt and the BaxSr1−xTiO3 supports. “Local model” nanofacets of the Pt surface, edge, and corner morphologies were developed as compact representations of adsorption and reaction sites. DFT was used as the primary modeling tool for the equilibrium adsorption states. We argue that adsorption on edge sites is critically important for the overall allyl alcohol selectivity of PtN catalysts. A simple model was developed to represent PtN strain effects caused by its interaction with the substrate. Bader topological atom, spherical volume averaging charge, and modified bond valence sum analyses were used to understand the bonding structure. Density of states analysis was performed for the structures of PtN, adsorbed AC, and intermediate products to examine adsorbate–particle interactions. The simulated hydrogenation of AC on PtN nanofacets was compared to the in situ hydrogenation of AC by PtN on BaxSr1−xTiO3 to examine the effects of facet, edge, and corner sites on the overall selectivity.

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Section: Introductionsupporting

confidence: 58%

Section: Atomiclayer Depositionmethodology and Pt N /Ba X Sr 1àx Tio mentioning

confidence: 99%

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids

et al. 2018

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“…The differential pumping system of ETEM is equipped with pressure limiting apertures in the bore of pole pieces and three additional turbo pumps to maintain the high vacuum in the electron source region. For a commercial Titan 80‐300 ETEM, the pressure difference between the specimen area and electron source can be greater than nine orders of magnitude, therefore one can have a gas pressure around the specimen up to 10 Torr . One of the merits of ETEM is its compatibility with various in situ holders, such as heating, cooling, biasing, and maintaining the tilt capability of the sample stage.…”

Section: In Situ Tem On Catalytic Gas Reactionmentioning

confidence: 99%

In Situ Transmission Electron Microscopy on Energy‐Related Catalysis

Hwang

Chen

Zhou

et al. 2019

Advanced Energy Materials

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Energy‐related catalytic reactions have been extensively investigated in past years in order to efficiently utilize clean and environmentally benign energy sources. In these systems, the catalysts and the catalyst/active medium interfaces play a crucial role in determining their performance. Thus, understanding the physical and chemical properties of catalysts during reactions is of importance to provide fundamental insights for designing the devices. Transmission electron microscopy can provide tremendous information regarding materials' morphology, microstructure, and chemical properties at nanoscales. With in situ electron microscopy, dynamic processes of catalytic reactions in both gas and liquid environments have been investigated in real time. In this paper, the recent research progress of in situ and operando electron microscopy techniques are introduced with the representative works in energy‐related reactions, including electrochemical catalysis in liquid media and heterogeneous catalysis in gas media. The uniqueness of the specific electron microscopy methods and scientific merits of each work are highlighted. Finally, outlooks on emerging research opportunities are discussed.

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“…See also Hansen and Wagner [52] and Hansen et al [53]. A critical account of this topic is given by Takeda et al [181], which includes a full bibliography.…”

Section: Falloutmentioning

confidence: 99%

The correction of electron lens aberrations

Hawkes

2015

Ultramicroscopy

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Environmental transmission electron microscopy for catalyst materials using a spherical aberration corrector

Cited by 48 publications

References 120 publications

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids

In Situ Transmission Electron Microscopy on Energy‐Related Catalysis

The correction of electron lens aberrations

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Environmental transmission electron microscopy for catalyst materials using a spherical aberration corrector

Cited by 48 publications

References 120 publications

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on BaxSr1−xTiO3Nanocuboids

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on BaxSr1−xTiO3Nanocuboids

In Situ Transmission Electron Microscopy on Energy‐Related Catalysis

The correction of electron lens aberrations

Contact Info

Product

Resources

About

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on Ba_xSr_1−xTiO₃Nanocuboids