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Nanomaterials (Basel). 2018 Aug 26;8(9). pii: E662. doi: 10.3390/nano8090662.

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

Author information

1
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya 466-8555, Japan. fuchigami.teruaki@nitech.ac.jp.
2
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya 466-8555, Japan. 30411057@stn.nitech.ac.jp.
3
Advanced Ceramics Research Center, Nagoya Institute of Technology, Gifu 507-0071, Japan. haneda.masaaki@nitech.ac.jp.
4
Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya 466-8555, Japan. haneda.masaaki@nitech.ac.jp.
5
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya 466-8555, Japan. kakimoto.kenichi@nitech.ac.jp.
6
Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya 466-8555, Japan. kakimoto.kenichi@nitech.ac.jp.

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.

KEYWORDS:

Catalyst; Co3O4; complex three-dimensional structure; hydrothermal synthesis; low-temperature CO oxidation; morphological control; nanoparticles; stability

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