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首页> 外文期刊>Advanced Functional Materials >A Microbial-Mineralization-lnspired Approach for Synthesis of Manganese Oxide Nanostructures with Controlled Oxidation States and Morphologies
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A Microbial-Mineralization-lnspired Approach for Synthesis of Manganese Oxide Nanostructures with Controlled Oxidation States and Morphologies

机译：微生物矿化启发法合成具有受控氧化态和形态的氧化锰纳米结构

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摘要

Manganese oxide nanostructures are synthesized by a route inspired by microbial mineralization in nature. The combination of organic molecules, which include antioxidizing and chelating agents, facilitates the parallel control of oxidation states and morphologies in an aqueous solution at room temperature. Divalent manganese hydroxide (Mn(OH)_2) is selectively obtained as a stable dried powder by using a combination of ascorbic acid as an antioxidizing agent and other organic molecules with the ability to chelate to manganese ions. The topotactic oxidation of the resultant Mn(OH)_2 leads to the selective formation of trivalent manganese oxyhydroxide (β-MnOOH) and trivalent/tetravalent sodium manganese oxide (birnes-site, Nao.5sMn_2O_4-1.SH_20). For microbial mineralization in nature, similar synthetic routes via intermediates have been proposed in earlier studies. Therefore, these synthetic routes, which include in the present study the parallel control over oxidation states and morphologies of manganese oxides, can be regarded as new biomimetic routes for synthesis of transition metal oxide nanostructures. As a potential application, it is demonstrated that the resultant β-MnOOH nanostructures perform as a cathode material for lithium ion batteries.
机译：氧化锰纳米结构是通过自然界中微生物矿化的途径合成的。包括抗氧化剂和螯合剂在内的有机分子的组合有助于在室温下并行控制水溶液中的氧化态和形态。通过使用抗坏血酸作为抗氧化剂和具有螯合锰离子能力的其他有机分子的组合，有选择地获得二价的氢氧化锰（Mn（OH）_2）作为稳定的干燥粉末。生成的Mn（OH）_2的全位氧化导致选择性形成三价羟基氧化锰（β-MnOOH）和三价/四价氧化锰钠（伯恩斯位，Nao.5sMn_2O_4-1.SH_20）。对于自然界中的微生物矿化，在较早的研究中已经提出了通过中间体的类似合成途径。因此，这些合成途径，包括本研究中对氧化锰的氧化态和形态的平行控制，可以被认为是合成过渡金属氧化物纳米结构的新的仿生途径。作为潜在的应用，证明了所得的β-MnOOH纳米结构用作锂离子电池的正极材料。

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  • 来源
    《Advanced Functional Materials》 |2010年第24期|p.4279-4286|共8页
  • 作者

    Manabu Oba; Yuya Oaki; Hiroaki Imai;

  • 作者单位

    Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan;

    Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan;

    Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan;

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