Nanoconfined nitrogen-doped carbon-coated MnO nanoparticles in graphene enabling high performance for lithium-ion batteries and oxygen reduction reaction.
Nanoconfined nitrogen-doped carbon-coated MnO nanoparticles in graphene enabling high performance for lithium-ion batteries and oxygen reduction reaction.
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石墨烯中的纳米级氮掺杂碳包覆 MnO 纳米颗粒可实现锂离子电池和氧还原反应的高性能
DOI：
10.1039/c5sc04668h
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发表时间：
2016-07-01
期刊：
影响因子：
8.4
通讯作者：
Zhang H
中科院分区：
文献类型：
--
作者：
Wang Y;Ding X;Wang F;Li J;Song S;Zhang H
制备了N掺杂双碳包覆MnO复合材料，并探讨了其在锂离子电池和氧还原反应中的应用。为了解决MnO作为锂离子电池（LIB）的阳极材料和作为氧还原反应（ORR）的催化剂的较差循环稳定性和低电导率的问题，探索了将N掺杂的碳包覆的MnO纳米颗粒限制在导电石墨烯基质中的简便且有效的策略。GMNCs的合成包括用聚多巴胺和石墨烯两步涂覆Mn 3 O 4纳米晶体，然后热处理以形成GNS@MnO@ N掺杂的碳复合材料（GMNCs）。当作为LIB的阳极材料进行评估时，由于双碳涂层设计，与碳涂覆的MnO和纯Mn 3 O 4相比，所制备的GMNC表现出改善的循环稳定性（在0.1 A g-1下350次循环后为754.3 mA h g-1）。作为ORR催化剂进行评价时，由于MnO和N掺杂的双碳涂层之间的协同效应，所制备的GMNCs表现出比纯Mn 3 O 4和MnO催化剂更高的电催化活性和比商业Pt/C催化剂更上级的稳定性。利用协同效应对独特纳米结构进行优化设计，为设计用于能量转换和存储的电极/催化剂提供了一条新的途径。
We prepared N-doped double carbon coated MnO composites and explored their applications in lithium ion batteries and oxygen reduction reaction. To tackle the issues of inferior cycling stability and low conductivity for MnO as an anode material for lithium ion batteries (LIBs) and as a catalyst for oxygen reduction reaction (ORR), a facile and effective strategy is explored to confine N-doped carbon-coated MnO nanoparticles in a conductive graphene matrix. The synthesis of the GMNCs involves the two-step coating of Mn3O4 nanocrystals with polydopamine and graphene, followed by heat treatment to form the GNS@MnO@N-doped carbon composites (GMNCs). When evaluated as anode materials for LIBs, the as-prepared GMNCs exhibit an improved cycling stability (754.3 mA h g–1 after 350 cycles at 0.1 A g–1) compared to carbon-coated MnO and pure Mn3O4 due to the double carbon coating design. When evaluated as catalysts for ORR, the as-prepared GMNCs exhibit higher electrocatalytic activity than that of pure Mn3O4 and MnO catalysts, and superior stability to a commercial Pt/C catalyst due to the synergetic effect between the MnO and N-doped double carbon coating. The optimum design of the unique nanostructures with the synergetic effect provides a new route to design advanced materials as electrode/catalysts for energy conversion and storage.
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影响因子：
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