| 초록 |
Bio-inspired and environmentally friendly chemical functionalization method for reduction of graphene oxide (GO) sponge using dopamine derivatives has been developed. The GO sponge is readily modified by poly(norepinephrine) (p(Nor)) through a simple wet chemistry, and mechanical properties of GO sponge is improved with structural stability. The oxidative polymerization of norepinephrine can considerably reduce the oxygen-containing species from the GO sponge surface as well as provide redox active quinone moieties for pseudocapacitive electrodes. Furthermore, three-dimensional macroporous networks of the GO sponge provides large surface area and continuous ion pathways. As a result, the p(Nor)@rGO sponge exhibits the enhanced capacitive performance. The p(Nor)@rGO sponge showed that a specific capacitance of 232.1 F g-1 (2.5 times higher than that of chemically converted rGO sponge) and good cyclic stability over 2000 charge/discharge cycling tests. |
