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Mild Strategy to Fabricate Mn x Co3−x O4 Multi-Shelled Hollow Spheres with Superior Catalytic Property in CO Oxidation

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Complex hollow structures of transition metal oxides, especially Co3O4-based mixed metal oxides, exhibit promising catalytic performances for CO oxidation and electro-catalysis. However, it still remains a challenge to synthesize hollow nanostructures with complex shell structures under mild and green conditions. Herein, a facile approach was developed to synthesize the Mn x Co3−x O4 multi-shelled hollow spheres, involving the penetration of Mn(II) and Co(II) ions into the carbonaceous spheres and the subsequent calcination in air with a low heating rate. The formation of the unique multi-shelled hollow structures is based on a heterogeneous contraction process caused by non-equilibrium heat treatment. Characterization techniques such as SEM, TEM, XRD, Raman, BET, XPS, and H2-TPR were used to measure the physicochemical properties and correlate the structure-activity properties of the resulting Mn x Co3−x O4 sample. Catalytic results indicated that the as-prepared Mn x Co3−x O4 sample exhibited impressive catalytic properties for CO oxidation in comparison to pure Co3O4 with the similar morphology and structure. The enhancement of the catalytic activity could be ascribed to the high special surface area, large pore volume and the synergistic interaction between the redox couples of Mn3+/Mn4+ and CO2+/Co3+. Importantly, the synthesis method can be easily extended to fabricate other metal oxides multi-shelled hollow spheres, such as Zn x Co3−x O4.
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Keywords: CO Oxidation; Catalysis; Co–Mn Binary Oxide; Multi-Shelled Hollow Structure; Sacrificial Template

Document Type: Research Article

Affiliations: 1: Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, People’s Republic of China 2: School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China

Publication date: November 1, 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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