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Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles

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  • Jaianth Vijayakumar

    (Paul Scherrer Institut)

  • Tatiana M. Savchenko

    (Paul Scherrer Institut)

  • David M. Bracher

    (Paul Scherrer Institut)

  • Gunnar Lumbeeck

    (University of Antwerp)

  • Armand Béché

    (University of Antwerp)

  • Jo Verbeeck

    (University of Antwerp)

  • Štefan Vajda

    (Czech Academy of Sciences)

  • Frithjof Nolting

    (Paul Scherrer Institut)

  • C.A.F. Vaz

    (Paul Scherrer Institut)

  • Armin Kleibert

    (Paul Scherrer Institut)

Abstract

Understanding chemical reactivity and magnetism of 3d transition metal nanoparticles is of fundamental interest for applications in fields ranging from spintronics to catalysis. Here, we present an atomistic picture of the early stage of the oxidation mechanism and its impact on the magnetism of Co nanoparticles. Our experiments reveal a two-step process characterized by (i) the initial formation of small CoO crystallites across the nanoparticle surface, until their coalescence leads to structural completion of the oxide shell passivating the metallic core; (ii) progressive conversion of the CoO shell to Co3O4 and void formation due to the nanoscale Kirkendall effect. The Co nanoparticles remain highly reactive toward oxygen during phase (i), demonstrating the absence of a pressure gap whereby a low reactivity at low pressures is postulated. Our results provide an important benchmark for the development of theoretical models for the chemical reactivity in catalysis and magnetism during metal oxidation at the nanoscale.

Suggested Citation

  • Jaianth Vijayakumar & Tatiana M. Savchenko & David M. Bracher & Gunnar Lumbeeck & Armand Béché & Jo Verbeeck & Štefan Vajda & Frithjof Nolting & C.A.F. Vaz & Armin Kleibert, 2023. "Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35846-0
    DOI: 10.1038/s41467-023-35846-0
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    References listed on IDEAS

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    4. Han Wang & Chunlin Chen & Yexin Zhang & Lixia Peng & Song Ma & Teng Yang & Huaihong Guo & Zhidong Zhang & Dang Sheng Su & Jian Zhang, 2015. "In situ oxidation of carbon-encapsulated cobalt nanocapsules creates highly active cobalt oxide catalysts for hydrocarbon combustion," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
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    1. Yao Zhang & Zezhou Li & Xing Tong & Zhiheng Xie & Siwei Huang & Yue-E Zhang & Hai-Bo Ke & Wei-Hua Wang & Jihan Zhou, 2024. "Three-dimensional atomic insights into the metal-oxide interface in Zr-ZrO2 nanoparticles," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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