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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Rational design of MnO2@MnO2 hierarchical nanomaterials and their catalytic activities
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Rational design of MnO2@MnO2 hierarchical nanomaterials and their catalytic activities

机译：MnO2 @ MnO2分级纳米材料的合理设计及其催化活性

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摘要

Hierarchically structured materials have special properties and possess potential in applications in the catalytic and electrochemical fields. Herein, two kinds of hierarchical core shell nanostructures, lavender-like alpha-MnO2@alpha-MnO2 and balsam pear-like alpha-MnO2@gamma-MnO2, were prepared by a facile room temperature method using alpha-MnO2 nanowires as a backbone under acidic and alkaline conditions, respectively. When being used as a catalyst for dimethyl ether combustion, alpha-MnO2@gamma-MnO2 exhibited a better performance than alpha-MnO2@alpha-MnO2 (T-10 = 171 vs. 196 degrees C; T-90 = 220 vs. 258 degrees C, SV = 30, 000 mL g(-1) h(-1)). It is concluded that the larger surface area, higher reducibility/oxygen mobility, richer surface oxygen species, and the relatively smaller apparent activation energy are responsible for the superior performance of alpha-MnO2@gamma-MnO2.
机译：分层结构的材料具有特殊的性能，在催化和电化学领域中具有潜在的应用潜力。在此，以α-MnO2纳米线为骨架，通过简便的室温法制备了薰衣草状的α-MnO2@α-MnO2和香脂状的α-MnO2@γ-MnO2这两种层次的核壳纳米结构。分别在酸性和碱性条件下。当用作二甲醚燃烧的催化剂时，α-MnO2@γ-MnO2表现出比α-MnO2@α-MnO2更好的性能（T-10 = 171 vs. 196摄氏度; T-90 = 220 vs. 258 C，SV = 30，000 mL g（-1）h（-1））。结论是，较大的表面积，较高的还原性/氧气迁移率，较丰富的表面氧种类和相对较小的表观活化能是α-MnO2@γ-MnO2优异性能的原因。

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