State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology , Lanzhou 730050, P. R. China.
Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
ACS Appl Mater Interfaces. 2017 Jan 11;9(1):668-676. doi: 10.1021/acsami.6b12370. Epub 2016 Dec 21.
Development of a supercapacitor device with both high gravimetric and volumetric energy density is one of the most important requirements for their practical application in energy storage/conversion systems. Currently, improvement of the gravimetric/volumetric energy density of a supercapacitor is restricted by the insufficient utilization of positive materials at high loading density and the inferior capacitive behavior of negative electrodes. To solve these problems, we elaborately designed and prepared a 3D core-shell structured Ni(OH)/MnO@carbon nanotube (CNT) composite via a facile solvothermal process by using the thermal chemical vapor deposition grown-CNTs as support. Owing to the superiorities of core-shell architecture in improving the service efficiency of pseudocapacitive materials at high loading density, the prepared Ni(OH)/MnO@CNT electrode demonstrated a high capacitance value of 2648 F g (1 A g) at a high loading density of 6.52 mg cm. Coupled with high-performance activated polyaniline-derived carbon (APDC, 400 F g at 1 A g), the assembled Ni(OH)/MnO@CNT//APDC asymmetric device delivered both high gravimetric and volumetric energy density (126.4 Wh kg and 10.9 mWh cm, respectively), together with superb rate performance and cycling lifetime. Moreover, we demonstrate an effective approach for building a high-performance supercapacitor with high gravimetric/volumetric energy density.
开发兼具高重量和高体积能量密度的超级电容器装置是将其实际应用于储能/转换系统的最重要要求之一。目前，超级电容器的重量/体积能量密度的提高受到高负载密度下正极材料未充分利用以及负极电容性能较差的限制。为了解决这些问题，我们通过使用热化学气相沉积生长的 CNT 作为支撑，通过简便的溶剂热工艺精心设计并制备了 3D 核壳结构的 Ni(OH)/MnO@碳纳米管（CNT）复合材料。由于核壳结构在提高高负载密度下赝电容材料的使用效率方面的优势，所制备的 Ni(OH)/MnO@CNT 电极在 6.52 mg cm 的高负载密度下表现出 2648 F g（1 A g）的高电容值。与高性能的聚苯胺衍生碳（APDC，在 1 A g 时为 400 F g）相结合，组装的 Ni(OH)/MnO@CNT//APDC 非对称器件兼具高重量和高体积能量密度（分别为 126.4 Wh kg 和 10.9 mWh cm），同时具有出色的倍率性能和循环寿命。此外，我们展示了一种构建具有高重量/体积能量密度的高性能超级电容器的有效方法。
