College of Materials Science and Engineering, Chongqing University, No. 174 Shazhengjie Road, Chongqing 400044, P.R. China.
College of Aerospace Engineering, and The State Key Laboratory of Mechanical Transmissions, Chongqing University, No. 174 Shazhengjie Road, Chongqing 400044, P.R. China.
Sci Rep. 2017 Mar 14;7:44562. doi: 10.1038/srep44562.
As known to all, hydrothermal synthesis is a powerful technique for preparing inorganic and organic materials or composites with different architectures. In this reports, by controlling hydrothermal conditions, nanostructured polyaniline (PANi) in different morphologies were composited with graphene sheets (GNS) and used as electrode materials of supercapacitors. Specifically, ultrathin PANi layers with total thickness of 10-20 nm are uniformly composited with GNS by a two-step hydrothermal-assistant chemical oxidation polymerization process; while PANi nanofibers with diameter of 50~100 nm are obtained by a one-step direct hydrothermal process. Benefitting from the ultrathin layer and porous structure, the sheet-like GNS/PANi composites can deliver specific capacitances of 532.3 to 304.9 F/g at scan rates of 2 to 50 mV/s. And also, this active material showed very good stability with capacitance retention as high as ~99.6% at scan rate of 50 mV/s, indicating a great potential for using in supercapacitors. Furthermore, the effects of hydrothermal temperatures on the electrochemical performances were systematically studied and discussed.
众所周知，水热合成是一种强大的技术，可用于制备具有不同结构的无机和有机材料或复合材料。在本报告中，通过控制水热条件，将不同形态的纳米结构聚苯胺（PANi）与石墨烯片（GNS）复合，并用作超级电容器的电极材料。具体而言，通过两步水热辅助化学氧化聚合工艺，将总厚度为 10-20nm 的超薄 PANi 层均匀地与 GNS 复合；而通过一步直接水热过程得到直径为 50-100nm 的 PANi 纳米纤维。得益于超薄层和多孔结构，片状 GNS/PANi 复合材料在扫描速率为 2 至 50mV/s 时可提供 532.3 至 304.9F/g 的比电容。此外，该活性材料在 50mV/s 的扫描速率下具有高达约 99.6%的电容保持率，表现出非常好的稳定性，表明其在超级电容器中有很大的应用潜力。此外，还系统地研究和讨论了水热温度对电化学性能的影响。
