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      Solvent-Free Chemical Approach to Synthesize Various Morphological Co3O4 for CO Oxidation.

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          Abstract

          Co3O4 nanomaterials with diverse morphologies were usually synthesized in liquid phase accompanied by the template or surfactant under harsh conditions, which further restricted their practical application. Herein, we reported an extremely simple and practical solid-state chemical method to synthesize Co3O4-octahedrons, -plates, and -rods. Among these, the shape control of Co3O4-octahedrons and Co3O4-plates involve variation of the amount of reactant, and the formation of Co3O4-rods with {110} facet can be achieved by replacing the reactant. The formation of the Co3O4 nanomaterials with different morphologies originated from the different microenvironments of reaction and the structure of reactants. The catalytic activity of Co3O4 samples for CO oxidation was evaluated in normal feed gas. The as-prepared Co3O4-rods exposed {110} facet exhibited superior catalytic activity for CO oxidation, which can be attributed to more oxygen defects on Co3O4-rods surface. Additionally, Co3O4-rods exhibited excellent durablility (without pretreatment) in normal feed gas, even in the presence of moisture, comparable or better than that reported in the literature. The practical and environmental friendly solvent-free strategy provided a new promising route for large-scale preparation of (metal) oxide with remarkable CO oxidation performance for practical application.

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          Author and article information

          Journal
          ACS Appl Mater Interfaces
          ACS applied materials & interfaces
          American Chemical Society (ACS)
          1944-8252
          1944-8244
          May 17 2017
          : 9
          : 19
          Affiliations
          [1 ] Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University , Urumqi, Xinjiang 830046, China.
          Article
          10.1021/acsami.7b01142
          28448113

          CO oxidation, Co3O4, catalyst, oxides, solid-state synthesis

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