Abstract
In this paper, novel reduced graphene oxide (rGO) composites (DAPrGOs) modified by diaminopyrene (DAP) were successfully synthesized via a facile solvothermal reaction method and used for supercapacitors. Compared with the pristine rGO, the DAPrGO1 electrode showed distinctly better performance (397.63 F g−1vs. 80.29 F g−1 of pristine rGO at 0.5 A g−1) with small charge transfer resistance. When a symmetric device was fabricated using DAPrGO1 as the active material, it also exhibited a high capacitance of 82.70 F g−1 at 0.5 A g−1 with an energy density of 25.84 W h kg−1 at a power density of 375 W kg−1, and even offered a high power density of 7500 W kg−1 (18.71 W h kg−1) at 10 A g−1. Moreover, the device possessed good electrochemical stability up to 20 000 cycles, implying promising applications in energy storage fields.
Highlights
With the ever-growing demand to use non-fossil energy sources and reduce greenhouse gases, supercapacitors have captured considerable attention as green and sustainable energy storage devices; they can deliver electrical energy very quickly, giving high power density and are indispensable supplements to batteries
We report the synthesis of 1,6-diaminopyrene (DAP) modi ed reduced graphene oxide materials (DAPrGOs) for the application of supercapacitors in alkaline electrolyte
Paper textural properties of the GO, rGO and DAPrGOs samples prepared by us were summarized in Table S1.† We can found that the SBET of DAPrGOs composite is much higher than that of material GO materials, which indicates that the degree of agglomeration of rGO obtained by solvothermal reduction with the participation of organic small molecule DAP is obviously reduced
Summary
With the ever-growing demand to use non-fossil energy sources and reduce greenhouse gases, supercapacitors have captured considerable attention as green and sustainable energy storage devices; they can deliver electrical energy very quickly, giving high power density and are indispensable supplements to batteries. GO was prepared by the modi ed Hummer's method.[29] In a typical experiment, 80 mg of GO was dispersed in 80 mL of ethanol and sonicated for 1 h, and 80 mg of DAP was added to the GO dispersion When it stirred vigorously for 3 h, the mixed solution was poured into a Te on-lined stainless steel autoclave (50 mL) for solvothermal reaction at 160 C for 15 h. Paper where C (F gÀ1) is the speci c capacitance, I (A) is the response current, Dt (s) is the discharge time, m (g) is the mass of active material, DU (V) is the range of potential In this simple symmetric supercapacitors system, two electrodes were separated by two layers of cellulose lm, sandwiched in two pieces of plastic, and nipped by a binder clip. Where I (A) is the response current, Dt (s) is the discharge time, DU (V) is the range of potential, M (g) is the total mass of both electrodes
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