Rational design of MnO2@MnO2 hierarchical nanomaterials and their catalytic activities. Issue 47 (24th October 2016)

• Record Type: Journal Article
• Authors: Zhang, Bentian; Cheng, Gao; Ye, Wenjin; Zheng, Xiaoying; Liu, Hengfa; Sun, Ming; Yu, Lin; Zheng, Yuying; Cheng, Xiaoling
• Is Part Of: Dalton transactions. Volume 45:Issue 47(2016)
• Page Start: 18851
• Page End: 18858
• Publication Date: 2016-10-24
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt03523j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Lavender-like α-MnO2 @α-MnO2 and balsam pear-like α-MnO2 @γ-MnO2 were prepared and α-MnO2 @γ-MnO2 exhibited a better performance than that of α-MnO2 @α-MnO2 in dimethyl ether combustion. 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-MnO2 and balsam pear-like α-MnO2 @γ-MnO2, were prepared by a facile room-temperature method using α-MnO2 nanowires as a backbone under acidic and alkaline conditions, respectively. When being used as a catalyst for dimethyl ether combustion, α-MnO2 @γ-MnO2 exhibited a better performance than α-MnO2 @α-MnO2 ( T 10 = 171 vs. 196 °C; T 90 = 220 vs. 258 °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 α-MnO2 @γ-MnO2 .