Dual Support System Ensuring Porous Co-Al Hydroxide Nanosheets with Ultrahigh Rate Performance and High Energy Density for Supercapacitors

作者：Wu, Xiaoliang^*; Jiang, Lili; Long, Conglai; Wei, Tong; Fan, Zhuangjun

来源：Advanced Functional Materials, 2015, 25(11): 1648-1655.

DOI：10.1002/adfm.201404142

• LAYERED DOUBLE HYDROXIDE
• COMPOSITES
• ELECTRODE
• GRAPHENE
• CARBON
• FOAM
• MNO2
• FABRICATION
• DESIGN
• ARRAYS

Layered double hydroxides (LDHs) are promising supercapacitor electrode materials due to their high specific capacitances. However, their electrochemical performances such as rate performance and energy density at a high current density, are rather poor. Accordingly, a facile strategy is demonstrated for the synthesis of the integrated porous Co-Al hydroxide nanosheets (named as GSP-LDH) with dual support system using dodecyl sulfate anions and graphene sheets as structural and conductive supports, respectively. Owing to fast ion/electron transport, porous and integrated structure, the GSP-LDH electrode exhibits remarkably improved electrochemical characteristics such as high specific capacitance (1043 F g(-1) at 1 A g(-1)) and ultra-high rate performance capability (912 F g(-1) at 20 A g(-1)). Moreover, the assembled sandwiched graphene/porous carbon (SGC)//GSP-LDH asymmetric supercapacitor delivers a high energy density up to 20.4 Wh kg(-1) at a very high power density of 9.3 kW kg(-1), higher than those of previously reported asymmetric supercapacitors. The strategy provides a facile and effective method to achieve high rate performance LDH based electrode materials for supercapacitors.

• 出版日期2015-3-18
• 单位哈尔滨工程大学