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Inflating Strategy To Form Ultrathin Hollow MnO2 Nanoballoons
Juanjuan Shang1, Beibei Xie1, Ya Li1
1Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of the P. R. China, ‡National Engineering Technology Research Center for Colloidal Materials, and §Key Laboratory of Special Functional Aggregated Materials of the Ministry of Education of the P. R. China, Shandong University , Jinan 250199, P. R. China.
Abstract:
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.
