Visualizing reacting single atoms in chemical reactions: Advancing the frontiers of materials research

Boyes, Edward; Gai, Pratibha L.

doi:10.1557/mrs.2015.141

Cited by 19 publications

(32 citation statements)

References 24 publications

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“…In principle, X‐ray photoelectron spectroscopy (XPS) analysis could provide valuable interaction on charge transfer in SAC . These characterization methods, if performed in situ (EXAFS, IR) or under environment conditions (STEM) are also extremely useful to obtain insight into the nature of the catalysis with SACs ,. Figure shows an overview of the complementary characterization methods (including DFT studies) required to assess structure and composition of SAC on carbon materials.…”

Section: Single Atom Catalyst Characterizationmentioning

confidence: 99%

“…[104] These characterization methods, if performed in situ (EXAFS, IR) or under environment conditions (STEM) are also extremely useful to obtain insight into the nature of the catalysis with SACs. [24,105] Figure 25 shows 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 an overview of the complementary characterization methods (including DFT studies) required to assess structure and composition of SAC on carbon materials.…”

Section: Single Atom Catalyst Characterizationmentioning

confidence: 99%

“…Additionally, the first report, in 1991, on single atom detection by EELS was also about uranium atoms on carbon . In 2015, the visualization of reacting single Pt atoms deposited on carbon support in chemical reactions was reported . All these progresses in surface science and modelling allow today an easier characterization of SAC on carbon materials.…”

Section: Introductionmentioning

confidence: 99%

“…[23] In 2015, the visualization of reacting single Pt atoms deposited on carbon support in chemical reactions was reported. [24] All these progresses in surface science and modelling allow today an easier characterization of SAC on carbon materials.…”

Section: Introductionmentioning

confidence: 99%

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Single Atom Catalysts on Carbon‐Based Materials

2018

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Metal particle size is an important parameter to consider when looking at supported catalyst performances. As for other properties, surface reactivity of metallic nanoparticles is thus highly size‐dependent. The smallest size that can be reached for this type of object is of course the isolated atom deposited on a support. The preparation of single‐atom catalysts (SAC) is not trivial, since to avoid clustering, the mean adsorption energy of the metal on the support should be higher than its cohesive energy. The choice of a support that allows a strongly interacting environment with the metal is therefore a key step in the preparation of such catalysts. The spectrum of carbon (nano)materials is very broad, and their structure as well as their surface chemistry, although sometime complex, can be tuned and exploited for the stabilization of SAC. This Review summarizes in a comprehensive manner experimental and computational studies aiming at: i) preparing SAC on carbon materials, ii) understanding the metal‐support interactions in SAC, and iii) studying how this relates to catalytic performances. The use of SAC follows well the needs dictated by society (energy and environment issues), and many studies have already been published in various fields, such as thermal catalysis, photocatalysis and electrocatalysis.

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Section: Single Atom Catalyst Characterizationmentioning

confidence: 99%

Section: Single Atom Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single Atom Catalysts on Carbon‐Based Materials

2018

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“…Further understanding of the reason for increased ripening under H 2 could be obtained by observing single-atom migration. As the mechanism is observed at its fundamental level, the requirement of modelling to interpret ac hange in particles ize is removed.T his work emphasises the importance of the newly developedE STEM, [47] which can achieve singleatom resolution in situ. [48] Figure 10.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Imaging of Ostwald Ripening by Environmental Scanning Transmission Electron Microscopy

2015

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The first dynamic atomic resolution environmental scanning transmission electron microscope (ESTEM) study of the nanoparticle sintering of a model Cu system is reported. ESTEM confers the advantage of a Z‐contrast dependence in industrially representative conditions to provide enhanced visibility of sub‐nanometer particles when compared with TEM. The importance of this is demonstrated by the significant enhancement in the Ostwald ripening rate of model Cu nanoparticles in the presence of 3 Pa hydrogen, an effect that is independent of the substrates studied. Temperatures of 400–550 °C are shown to switch the operating regime of the rate‐limiting mechanism. Cu catalysts are used for methanol synthesis and hydrocarbon‐conversion processes for fuel cells, and the importance of observing these catalysts in their working states is demonstrated. Unique ESTEM observations of Ostwald ripening are combined with kinetic models to improve the technical understanding of catalyst deactivation mechanisms.

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Einzelatomkatalysatoren auf kovalenten Triazinnetzwerken: am Scheidepunkt zwischen homogener und heterogener Katalyse

2022

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Heterogene Single-Site-und Einzelatom-Katalysatoren bieten die Möglichkeit, die hohe katalytische Aktivität und Selektivität molekularer Katalysatoren mit dem einfachen kontinuierlichen Betrieb und Recycling fester Katalysatoren zu kombinieren. In den letzten Jahren fanden kovalente Triazinnetzwerke (CTFs) als Trägermaterialien für partikuläre und isolierte Metallspezies zunehmende Beachtung. Sie weisen einen hohen Anteil an Stickstofffunktionalitäten auf und ermöglichen die Koordination molekularer Metallspezies bzw. die Stabilisierung partikulärer Metallspezies. Je nach Synthesemethode und Vorbehandlung der CTFs entstehen Materialien, die gut definierten, hoch vernetzten Polymeren ähneln, oder Materialien, die mit strukturell undefinierten stickstoffhaltigen Kohlenstoffen vergleichbar sind. Dementsprechend dienen CTFs als Modellsysteme, die es ermöglichen, die Wechselwirkung von Single-Site-, einzelatomaren und partikulären Metallspezies mit solchen Trägern aufzuklären. Faktoren, die den Übergang zwischen molekularen und partikulären Systemen beeinflussen, werden diskutiert, um die Grundlage zur Entwicklung maßgeschneiderter Katalysatorsysteme zu schaffen.

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Visualizing reacting single atoms in chemical reactions: Advancing the frontiers of materials research

Cited by 19 publications

References 24 publications

Single Atom Catalysts on Carbon‐Based Materials

Single Atom Catalysts on Carbon‐Based Materials

Dynamic Imaging of Ostwald Ripening by Environmental Scanning Transmission Electron Microscopy

Einzelatomkatalysatoren auf kovalenten Triazinnetzwerken: am Scheidepunkt zwischen homogener und heterogener Katalyse

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