Inflating Strategy To Form Ultrathin Hollow MnO2 Nanoballoons

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• 作者：Juanjuan Shang ; Beibei Xie ; Ya Li ; Xin Wei ; Na Du ; Haiping Li ; Wanguo Hou ; Renjie Zhang
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：June 28, 2016
• 年：2016
• 卷：10
• 期：6
• 页码：5916-5921
• 全文大小：359K
• 年卷期：0
• ISSN：1936-086X

文摘

Ultrathin MnO₂ hollow nanoballoons (UMHNBs) have a large ratio of interfacial to total atoms, corresponding to expected improved performance. However, their synthesis is a challenge due to difficulty in controlling the concentration of the unit cells. Herein, we describe a strategy to synthesize dry intact UMHNBs through a one-step synthesis by inflating MnO₂ (reduced from KMnO₄) with CO₂ (oxidized from single-layer graphene oxide nanosheets) followed by instant freeze-drying. UMHNBs are 30–500 nm in diameter with a shell thickness of 3.7 nm, packing with laminar [MnO₆] unit cells in the form of δ-MnO₂. UMHNBs show efficient catalytic activity for decomposing the organic dye methylene blue (MB), 15 times the biggest reported value, and have long-term catalytic efficacy and durability. The described strategy in this paper makes use of graphene nanosheets to assemble durable ultrathin hollow nanoballoons.