Unusual Nanometer-Sized Nsutite from Mn(ClO_4)_2・6H_2O-(C_2H_5)_4NOH-CsMnO_4-H_2O Basic Systems
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概要
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Nanometer-sized manganese oxides materials are one of the focuses for scientists in this field and novel properties may be found, due to quantum confinement effects. The most widely used cathode materials in primary alkaline batteries nsutite (γ-MnO2) is often described as an intergrowth of pyrolusite and ramsdellite tunnel structures. Our research concerns the preparation, structures, and properties of nanometer-sized nsutite with the longest diameter sizes of about 30–40 nm from Mn(ClO4)2·6H2O-(C2H5)4NOH-CsMnO4–H2O basic systems, instead of traditional nsutite synthesized in the acidic environments. Flat perfect crystal surfaces of nanometer-sized nsutite characterized by FESEM show that there are pure and fewer cation vacancies defects on the surface of the frameworks, further proved by IR, TG, and BET methods. The CV experiment results showed that the currents at –240 mV, corresponding to the homogeneous reduction from Mn4+ to Mn3+, were twice of traditional samples from acidic environments, due to the small particle size, fewer cation vacancies, and larger numbers of Mn4+ ions on the surfaces.
- 社団法人 化学工学会の論文
- 2003-10-01
著者
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Suib Steven
Department Of Chemistry University Of Connecticut
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Suib Steven
Department Of Chemistry Connecticut University
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GAO Qiuming
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute o
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Gao Qiuming
State Key Laboratory Of High Performance Ceramics And Superfine Structure Shanghai Institute Of Cera
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THOMSON MARY
North Atlantic Group, Duracell Company
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BOWDEN WILLIAM
North Atlantic Group, Duracell Company
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Thomson Mary
North Atlantic Group Duracell Company
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Bowden William
North Atlantic Group Duracell Company
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