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In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO

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In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO. / LaGrow, Alec; Lloyd, David Carlos; Gai, Pratibha L; Boyes, Edward.

In: Chemistry of Materials, Vol. 30, 09.01.2018, p. 197-203.

Research output: Contribution to journalArticle

Harvard

LaGrow, A, Lloyd, DC, Gai, PL & Boyes, E 2018, 'In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO', Chemistry of Materials, vol. 30, pp. 197-203. https://doi.org/10.1021/acs.chemmater.7b04184, https://doi.org/10.1021/acs.chemmater.7b04184

APA

LaGrow, A., Lloyd, D. C., Gai, P. L., & Boyes, E. (2018). In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO. Chemistry of Materials, 30, 197-203. https://doi.org/10.1021/acs.chemmater.7b04184, https://doi.org/10.1021/acs.chemmater.7b04184

Vancouver

LaGrow A, Lloyd DC, Gai PL, Boyes E. In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO. Chemistry of Materials. 2018 Jan 9;30:197-203. https://doi.org/10.1021/acs.chemmater.7b04184, https://doi.org/10.1021/acs.chemmater.7b04184

Author

LaGrow, Alec ; Lloyd, David Carlos ; Gai, Pratibha L ; Boyes, Edward. / In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO. In: Chemistry of Materials. 2018 ; Vol. 30. pp. 197-203.

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@article{cb32ac87aa3f4e18a90da47907c572ee,
title = "In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO",
abstract = "Oxidation and reduction cycles are used in the regeneration of nanoparticle catalysts that have deactivated due to sintering or poisoning. Nickel oxidation and reduction cycles for the redispersion of nickel nanoparticles were studied via in situ high angle annular dark field environmental scanning transmission electron microscopy. Cycling the Ni/NiO system through successive redox cycles shows that the particles retain the same general size distributions even though Ostwald ripening and particle migration and coalescence is occurring. The regeneration of the smallest nanoparticle sizes, which disappear due to sintering processes, occur by the ejection of small (2−3 nm) nickel particles during the reduction of the hollow nickel oxide nanostructures. The nickel nanoparticles above ∼3.5 nm in size form hollow polycrystalline nickel oxide nanostructures upon oxidation. Upon reduction, the grains making up the shell of the hollow nickel oxide reduce separately at the grains surface and at the grain boundaries between the polycrystalline grains. The contraction in particle size upon reduction destabilizes the hollow nanostructure and causes the particle to rearrange and collapse. As this process occurs, some parts of the material are ejected from the reducing particle and forms small particles of nickel, which regenerate the smallest parts of the size distribution. Once the particle collapses, the nickel rearranges, reforming solid nickel nanoparticles enclosed by low index facets.",
keywords = "In situ ESTEM, Nanoparticles redispersion reduction , redispersion , reduction",
author = "Alec LaGrow and Lloyd, {David Carlos} and Gai, {Pratibha L} and Edward Boyes",
note = "{\circledC} 2017 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details",
year = "2018",
month = "1",
day = "9",
doi = "10.1021/acs.chemmater.7b04184",
language = "English",
volume = "30",
pages = "197--203",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - In Situ Scanning Transmission Electron Microscopy of Ni Nanoparticle Redispersion via the Reduction of Hollow NiO

AU - LaGrow, Alec

AU - Lloyd, David Carlos

AU - Gai, Pratibha L

AU - Boyes, Edward

N1 - © 2017 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

PY - 2018/1/9

Y1 - 2018/1/9

N2 - Oxidation and reduction cycles are used in the regeneration of nanoparticle catalysts that have deactivated due to sintering or poisoning. Nickel oxidation and reduction cycles for the redispersion of nickel nanoparticles were studied via in situ high angle annular dark field environmental scanning transmission electron microscopy. Cycling the Ni/NiO system through successive redox cycles shows that the particles retain the same general size distributions even though Ostwald ripening and particle migration and coalescence is occurring. The regeneration of the smallest nanoparticle sizes, which disappear due to sintering processes, occur by the ejection of small (2−3 nm) nickel particles during the reduction of the hollow nickel oxide nanostructures. The nickel nanoparticles above ∼3.5 nm in size form hollow polycrystalline nickel oxide nanostructures upon oxidation. Upon reduction, the grains making up the shell of the hollow nickel oxide reduce separately at the grains surface and at the grain boundaries between the polycrystalline grains. The contraction in particle size upon reduction destabilizes the hollow nanostructure and causes the particle to rearrange and collapse. As this process occurs, some parts of the material are ejected from the reducing particle and forms small particles of nickel, which regenerate the smallest parts of the size distribution. Once the particle collapses, the nickel rearranges, reforming solid nickel nanoparticles enclosed by low index facets.

AB - Oxidation and reduction cycles are used in the regeneration of nanoparticle catalysts that have deactivated due to sintering or poisoning. Nickel oxidation and reduction cycles for the redispersion of nickel nanoparticles were studied via in situ high angle annular dark field environmental scanning transmission electron microscopy. Cycling the Ni/NiO system through successive redox cycles shows that the particles retain the same general size distributions even though Ostwald ripening and particle migration and coalescence is occurring. The regeneration of the smallest nanoparticle sizes, which disappear due to sintering processes, occur by the ejection of small (2−3 nm) nickel particles during the reduction of the hollow nickel oxide nanostructures. The nickel nanoparticles above ∼3.5 nm in size form hollow polycrystalline nickel oxide nanostructures upon oxidation. Upon reduction, the grains making up the shell of the hollow nickel oxide reduce separately at the grains surface and at the grain boundaries between the polycrystalline grains. The contraction in particle size upon reduction destabilizes the hollow nanostructure and causes the particle to rearrange and collapse. As this process occurs, some parts of the material are ejected from the reducing particle and forms small particles of nickel, which regenerate the smallest parts of the size distribution. Once the particle collapses, the nickel rearranges, reforming solid nickel nanoparticles enclosed by low index facets.

KW - In situ ESTEM, Nanoparticles redispersion reduction

KW - redispersion

KW - reduction

U2 - 10.1021/acs.chemmater.7b04184

DO - 10.1021/acs.chemmater.7b04184

M3 - Article

VL - 30

SP - 197

EP - 203

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

ER -