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Nanomaterials 2018, 8(9), 662; https://doi.org/10.3390/nano8090662

Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst

1
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya 466-8555, Japan
2
Advanced Ceramics Research Center, Nagoya Institute of Technology, Gifu 507-0071, Japan
3
Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya 466-8555, Japan
*
Author to whom correspondence should be addressed.
Received: 5 August 2018 / Revised: 21 August 2018 / Accepted: 22 August 2018 / Published: 26 August 2018
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Abstract

Highly stable and active low-temperature CO oxidation catalysts without noble metals are desirable to achieve a sustainable society. While zero-dimensional to three-dimensional Co3O4 nanoparticles show high catalytic activity, simple-structured nanocrystals easily self-aggregate and become sintered during catalytic reaction. Thus, complex three-dimensional nanostructures with high stability are of considerable interest. However, the controlled synthesis of complex nanoscale shapes remains a great challenge as no synthesis theory has been established. In this study, 100 nm raspberry-shaped nanoparticles composed of 7–8 nm Co3O4 nanoparticles were synthesized by hydrothermally treating cobalt glycolate solution with sodium sulfate. Surface single nanometer-scale structures with large surface areas of 89 m2·g−1 and abundant oxygen vacancies were produced. The sulfate ions functioned as bridging ligands to promote self-assembly and suppress particle growth. The Co3O4 nano-raspberry was highly stable under catalytic tests at 350 °C and achieved nearly 100% CO conversion at room temperature. The addition of bridging ligands is an effective method to control the formation of complex but ordered three-dimensional nanostructures that possessed extreme thermal and chemical stability and exhibited high performance. View Full-Text
Keywords: Catalyst; Co3O4; complex three-dimensional structure; hydrothermal synthesis; low-temperature CO oxidation; morphological control; nanoparticles; stability Catalyst; Co3O4; complex three-dimensional structure; hydrothermal synthesis; low-temperature CO oxidation; morphological control; nanoparticles; stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Fuchigami, T.; Kimata, R.; Haneda, M.; Kakimoto, K.-I. Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst. Nanomaterials 2018, 8, 662.

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