Thin Co 3 O 4 nanosheet array on 3D porous graphene/nickel foam as a binder-free electrode for high-performance supercapacitors
| Autor: | Yuan Zhong, Lixia Quan, Ling Chang, Chu-Nan Cao, Huiqing Fan, Shasha Zhu, Jianqing Zhang, Jianming Wang, Kai Wang, Mengqi Yuan, Haibo Shao |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Materials science Graphene General Chemical Engineering Graphene foam chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences law.invention Electrophoretic deposition Nickel chemistry law Electrode Electrochemistry 0210 nano-technology Nanosheet |
| Zdroj: | Electrochimica Acta. 188:222-229 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2015.12.011 |
| Popis: | Transition metal oxide nanostructures are one of current investigation focuses for supercapacitors. We herein report a novel and facile approach to fabricate Co 3 O 4 nanosheet arrays on 3D porous graphene/nickel foam. A graphene layer with the sharp edges and wrinkles is obtained on nickel foam by an electrophoretic deposition (EPD). The 2D thin Co 3 O 4 nanosheets are further grown on the 3D porous graphene/nickel foam substrate through a hydrothermal synthesis, forming a 3D hierarchically porous architecture. The as-fabricated thin Co 3 O 4 nanosheet array on graphene/nickel foam delivers a high specific capacitance of 3533 F g ⿿1 at a current of 1 A g ⿿1 . The array electrode still shows a specific capacitance of 2222 F g ⿿1 even at a high rate (20 A g ⿿1 ), demonstrating its prominent rate capability. Furthermore, the array electrode also exhibits the excellent electrochemical cycling stability with a specific capacitance of 2459 F g ⿿1 after 2000 cycles at a current of 8 A g ⿿1 . The superior pseudocapacitive performance of the array electrode can be attributed to its unique structure characteristics. The thin Co 3 O 4 nanosheet array electrode with superior pseudocapacitive performance reveals the promising potential as a high-performance electrode for supercapacitors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect