title: Rational design of MnO2@MnO2hierarchical nanomaterials and their catalytic activities.
abstract: 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 α-MnO2@α-MnO2and balsam pear-like α-MnO2@γ-MnO2, were prepared by a facile room-temperature method using α-MnO2nanowires as a backbone under acidic and alkaline conditions, respectively. When being used as a catalyst for dimethyl ether combustion, α-MnO2@γ-MnO2exhibited a better performance than α-MnO2@α-MnO2(T10= 171 vs. 196 °C; T90= 220 vs. 258 °C, SV = 30, 000 mL g-1h-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 α-MnO2@γ-MnO2.
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Bentian
authors: B
authors: Zhang
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Gao
authors: G
authors: Cheng
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Wenjin
authors: W
authors: Ye
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Xiaoying
authors: X
authors: Zheng
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Hengfa
authors: H
authors: Liu
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Ming
authors: M
authors: Sun
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Lin
authors: L
authors: Yu
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Yuying
authors: Y
authors: Zheng
authors: Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R.China. sunmgz@gdut.edu.cn.
authors: Xiaoling
authors: X
authors: Cheng