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首页> 美国卫生研究院文献>Nanoscale Research Letters >Facile synthesis and strongly microstructure-dependent electrochemical properties of graphene/manganese dioxide composites for supercapacitors
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Facile synthesis and strongly microstructure-dependent electrochemical properties of graphene/manganese dioxide composites for supercapacitors

机译：超级电容器石墨烯/二氧化锰复合材料的简便合成和与微观结构密切相关的电化学性能

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Graphene has attracted much attention since it was firstly stripped from graphite by two physicists in 2004, and the supercapacitor based on graphene has obtained wide attention and much investment as well. For practical applications of graphene-based supercapacitors, however, there are still many challenges to solve, for instance, to simplify the technological process, to lower the fabrication cost, and to improve the electrochemical performance. In this work, graphene/MnO2 composites are prepared by a microwave sintering method, and we report here a relatively simple method for the supercapacitor packaging, i.e., dipping Ni-foam into a graphene/MnO2 composite solution directly for a period of time to coat the active material on a current collector. It is found that the microwave reaction time has a significant effect on the microstructure of graphene/MnO2 composites, and consequently, the electrochemical properties of the supercapacitors based on graphene/MnO2 composites are strongly microstructure dependent. An appropriately longer microwave reaction time, namely, 15 min, facilitates a very dense and homogeneous microstructure of the graphene/MnO2 composites, and thus, excellent electrochemical performance is achieved in the supercapacitor device, including a high specific capacitance of 296 F/g and a high capacitance retention of 93% after 3,000 times of charging/discharging cycles.PACS81.05.ue; 78.67.Sc; 88.80.fh
机译：石墨烯自从2004年由两位物理学家首先从石墨中剥离以来就引起了广泛的关注，基于石墨烯的超级电容器也受到了广泛的关注和大量的投资。然而，对于基于石墨烯的超级电容器的实际应用，仍然存在许多挑战需要解决，例如，简化工艺过程，降低制造成本以及提高电化学性能。在这项工作中，石墨烯/ MnO2复合材料是通过微波烧结方法制备的，我们在这里报告了一种相对简单的超级电容器包装方法，即将镍泡沫直接浸入石墨烯/ MnO2复合材料溶液中一段时间​​以进行涂覆集电器上的活性材料。发现微波反应时间对石墨烯/ MnO2复合材料的微观结构有重大影响，因此，基于石墨烯/ MnO2复合材料的超级电容器的电化学性能与微观结构密切相关。适当更长的微波反应时间（即15分钟）有助于石墨烯/ MnO2复合材料非常致密且均匀的微观结构，因此，超级电容器器件具有出色的电化学性能，包括296F / g的高比电容和在3,000次充电/放电循环后，电容保持率高达93％.PACS81.05.ue; 78.67.Sc; 88.80.fh

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