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Multi-porous Co3O4 nanoflakes@ sponge-like few-layer partially reduced graphene oxide hybrids: towards highly stable asymmetric supercapacitors

  • Date: 2017/6/20
  • Authors : Mohammad Qorbani, Tsu-chin Chou, Yi-Hsin Lee, Satyanarayana Samireddi, Naimeh Naseri, Abhijit Ganguly, Ali Esfandiar, Chen-Hao Wang, Li-Chyong Chen, Kuei-Hsien Chen, Alireza Z Moshfegh
  • Journal : Journal of Materials Chemistry A

The controlled growth of metal oxide nanostructures within hierarchically porous conductive carbon-based frameworks is critically important to achieving high volumetric performance and appropriate channel size for energy storage applications. Herein, we grow cobalt oxide (Co3O4) nanoflakes, using a sequential-electrodeposition process, into spherically porous sponge-like few-layer partially reduced graphene oxide (SrGO) synthesized by template- directed ordered assembly. Maximum specific/volumetric capacitances of 1112 F gCo3O4− 1 (at 3.3 A gCo3O4− 1), 178 F cm− 3 (at 2.6 A cm− 2), and 406 F gtotal− 1 (at 1 A gtotal− 1) and sensible rate capability (80% retention by increasing the charge/discharge current from 1 A g− 1 to 16 A g− 1) are obtained for the Co3O4 nanoflakes@ SrGO hybrid electrodes. Besides, an asymmetric supercapacitor is made with the Co3O4 [63%]@ SrGO [37%] …