Towards efficient use of noble metals <i>via</i> exsolution exemplified for CO oxidation

Tang, Chenyang; Kousi, Kalliopi; Neagu, Dragoş; Portolés, José F.; Papaioannou, Evangelos I.; Metcalfe, Ian S.

doi:10.1039/c9nr05617c

Cited by 47 publications

(86 citation statements)

References 37 publications

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“…Catalysts 2020, 10, x FOR PEER REVIEW 3 of 14 they are likely to dictate oxygen capacity, reactivity and stability against coking and agglomeration. All the above are expected to be greatly influenced by the microstructure of the materials [14,22]. Figure 3d it apparent that the fP displays a very rough, porous surface with very small crystallites, as would be expected following a ball milling process.…”

Section: Microstructural Design Of Perovskite System For Redox Methanmentioning

confidence: 81%

Section: Microstructural Design Of Perovskite System For Redox Methanmentioning

confidence: 99%

“…One way to achieve this is to incorporate noble metals into eno/exo-particle systems because of their ability to activate methane at very low temperatures and their capability of increasing the extraction of oxygen from the bulk of oxides [19][20][21]. Nevertheless, the extension of the exsolution of noble metals on the surface of perovskite oxides is still limited [22].…”

Section: Introductionmentioning

confidence: 99%

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Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

2020

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Exsolution of surface and bulk nanoparticles in perovskites has been recently employed in chemical looping methane partial oxidation because of the emergent materials’ properties such as oxygen capacity, redox stability, durability, coke resistance and enhanced activity. Here we attempt to further lower the temperature of methane conversion by complementing exsolution with infiltration. We prepare an endo/exo-particle system using exsolution and infiltrate it with minimal amount of Rh (0.1 wt%) in order to functionalize the surface and induce low temperature activity. We achieve a temperature decrease by almost 220 °C and an increase of the activity up to 40%. We also show that the initial microstructure of the perovskite plays a key role in controlling nanoparticle anchorage and carbon deposition. Our results demonstrate that microstructure tuning and surface functionalization are important aspects to consider when designing materials for redox cycling applications.

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Section: Microstructural Design Of Perovskite System For Redox Methanmentioning

confidence: 81%

Section: Microstructural Design Of Perovskite System For Redox Methanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

2020

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“…10 Such exsolved nanoparticles are partly embedded in the parent perovskite and thus more stable against agglomeration 11 and coking 12,13 and oen more active. [14][15][16] We have recently demonstrated that the exsolution concept can be controlled to produce systems with particles on the surface as well as in the bulk, leading to oxygen carrier materials that can selectively convert methane to syngas by chemical looping at 600 C, much lower than similar chemical lopping processes. 17 To further lower this temperature, one would have to increase the surface reactivity of the material as well as increase the oxygen transport through the bulk.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22][23][24][25] Additionally, the surface reactivity and oxygen diffusion could be improved by increasing the porosity of the samples. 15,26 Here we use the design principles outlined above to demonstrate a Co-Ni perovskite oxide system with surface ("exo-") and bulk ("endo-") nanoparticles that, due to its tailored chemistry and microstructure, can convert methane at temperatures as low as 450 C (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Low temperature methane conversion with perovskite-supported exo/endo-particles

et al. 2020

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Exsolution Modeling and Control to Improve the Catalytic Activity of Nanostructured Electrodes

et al. 2023

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In situ exsolution for nanoscale electrode design has attracted considerable attention because of its promising activity and high stability. However, fundamental research on the mechanisms underlying particle growth remains insufficient. Herein, cation‐diffusion‐determined exsolution is presented using an analytical model based on classical nucleation and diffusion. In the designed perovskite system, the exsolution trend for particle growth is consistent with this diffusion model, which strongly depends on the initial cation concentration and reduction conditions. Based on the experimental and theoretical results, a highly Ni‐doped anode and an electrochemical switching technique are employed to promote exsolution and overcome growth limitations. The optimal cell exhibits an outstanding maximum power density of 1.7 W cm−2 at 900 °C and shows no evident degradation when operating at 800 °C for 240 h under wet H2. This study provides crucial insights into the developing and tuning of heterogeneous catalysts for energy‐conversion applications.

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Towards efficient use of noble metals via exsolution exemplified for CO oxidation

Abstract: Towards controlled nanostructures and efficient use of noble metals via exsolution exemplified for CO oxidation.

Cited by 47 publications

References 37 publications

Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

Low temperature methane conversion with perovskite-supported exo/endo-particles

Exsolution Modeling and Control to Improve the Catalytic Activity of Nanostructured Electrodes

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