Supercapacitive behavior of electrostatic self-assembly reduced graphene oxide/CoAl-layered double hydroxides nanocomposites

作者：Zhong, Yayun; Liao, Yuqing; Gao, Aimei; Hao, Junnan; Shu, Dong^*; Huang, Yulan; Zhong, Jie; He, Chun^*; Zeng, Ronghua

来源：Journal of Alloys and Compounds, 2016, 669: 146-155.

DOI：10.1016/j.jallcom.2016.01.251

• RGO/CoAl-layered double hydroxide
• Electrostatic self-assembly
• Hydrothermal reduction
• Supercapacitor

Graphene oxide/CoAl-layered double hydroxide (GO/CoAl-LDHs) composites were successfully prepared by a face-to-face electrostatic self-assembly method. Positively charged colloidal CoAl-LDHs nanosheets (CoAl-LDH-NS) and negatively charged colloidal GO nanosheets were uniformly mixed; then CoAl-LDHNS were assembled on GO nanosheets via electrostatic attraction to prepare GO/CoAl-LDHs composites. The GO/CoAl-LDHs composites were then transformed to the reduced graphene oxide/CoAl-layered double hydroxide (RGO/CoAl-LDHs) composites with a hydrothermal method. The results showed that the content of RGO has a remarkable influence on the capacitive properties of composites. Among the composites with different RGO content, the RGO/CoAl-LDHs composite containing 12.0 wt% RGO displayed a maximum specific capacitance of 825 F g(-1) at low current density of 1 A g(-1), while that of pure CoAl-LDHs was 552 F g(-1). The capacitance retention of the RGO/CoAl-LDHs composite from 1 A g(-1) to 8 A g(-1) is found to be 62.3%, whereas that of pure CoAl-LDHs is only 31.9%. Face-to-face self-assembling between positively charged CoAl-LDH-NS and negatively charged GO nanosheets can effectively reduce the self-agglomeration of GO nanosheets and avoid CoAl-LDH-NS stacking together, which lead to improvement of the capacitive performance.

• 出版日期2016-6-5
• 单位中山大学; 华南师范大学