Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China.
ACS Appl Mater Interfaces. 2013 May;5(9):3764-9. doi: 10.1021/am400387t. Epub 2013 Apr 17.
In this study, graphene aerogel (GA)-supported Fe2O3 particles with three-dimensional (3D) architecture was prepared by a one-pot hydrothermal process. Fe2O3 particles were dispersed uniformly on the graphene sheets, and the resulting composites self-assembled into a 3D network via hydrothermal treatment. This strategy provides a facile and environmentally friendly method for the large-scale synthesis of Fe2O3/GAs without any additional reductant. As the anode material for lithium ion batteries, the Fe2O3/GAs in this study manifested an excellent reversible capacity of 995 mA h g(-1) after 50 cycles at a charge-discharge rate of 100 mA g(-1) and even delivered reversible capacity as high as 372 mA h g(-1) at a high rate of 5000 mA g(-1). The outstanding electrochemical performance of Fe2O3/GAs can be attributed to the synergistic interaction between uniformly dispersed Fe2O3 particles and graphene aerogel, in which a robust 3D framework of graphene provided highly conductive networks with a large surface area and short diffusion path length for the transport of lithium ions.
在这项研究中，通过一步水热法制备了具有三维（3D）结构的石墨烯气凝胶（GA）负载的 Fe2O3 颗粒。Fe2O3 颗粒均匀分散在石墨烯片上，所得复合材料通过水热处理自组装成 3D 网络。该策略提供了一种简便且环保的方法，可在没有任何额外还原剂的情况下大规模合成 Fe2O3/GA。作为锂离子电池的阳极材料，Fe2O3/GA 在 100 mA g(-1)的充放电速率下经过 50 次循环后表现出优异的可逆容量为 995 mA h g(-1)，即使在 5000 mA g(-1)的高速率下也能提供高达 372 mA h g(-1)的可逆容量。Fe2O3/GA 的出色电化学性能可归因于均匀分散的 Fe2O3 颗粒与石墨烯气凝胶之间的协同相互作用，其中石墨烯的坚固 3D 框架提供了具有大表面积和短锂离子扩散路径长度的高导电性网络。
