The effect of reduction time on the surface functional groups and supercapacitive performance of graphene nanosheets

Oxygen Clusters Distributed in Graphene with “Paddy Land” Structure: Ultrahigh Capacitance and Rate Performance for Supercapacitors

“…In addition, the electrochemical performances of RGO can be effectively improved by the increase of annealing temperature and time (Figure S10, Supporting Information), which is proportional to the total content of both COH and OCOH groups ( Figure a). The excellent rate performance of RGO with “paddy land” structure is much better than those of the typically reported RGO samples reduced by chemical reduction, hydrothermal, or thermal annealing methods …”

“…Interestingly, when the mass loading of electroactive material is 10 mg cm −2 , the GO‐160‐8D electrode still exhibits high specific capacitance of 316 F g −1 at 0.5 A g −1 (213 F g −1 at 20 A g −1 ), much higher than that of commercial activated carbon (YP‐50, 192 F g −1 at 0.5 A g −1 and 106 F g −1 at 20 A g −1 ), indicating excellent electrochemical performances for the practical application in supercapacitors (Figure b; Figure S11, Supporting Information). More importantly, as shown in Figure c, the capacitance of the GO‐160‐8D is much higher than those observed for other chemical reduced GO, hydrothermal reduced GO, and thermal reduced GO (Table S2, Supporting Information), meaning that RGO obtained by such a green and energy‐efficient process is a promising electrode material for application in high‐performance supercapacitors. Simultaneously, the GO‐160‐8D displays 94% of capacitance and 12.3% of oxygen content retention over 10 000 cycles (Figure d; Figure S12, Supporting Information), indicating excellent electrochemical stability and high reversibility.…”

Free-standing hybrid films based on graphene and porous carbon particles for flexible supercapacitors

“…The presence of oxygen and nitrogen functional groups is an important feature due to their capacitance enhancement through reversible redox reactions and also due to their ability to improve the wettability of the electrodes. 37,38 The nature and distribution of the oxygen functional groups present in the GP and HGP samples was investigated by XPS ( Figure 2a and C-N (285.6 eV) (see Table S1). [39][40][41][42][43] The XRD patterns in Figure 2b reveal a broad band at around 24.7º.…”

A novel porous CuO nanorod/rGO composite as a high stability anode material for lithium-ion batteries

“…In addition, a new small and broad (002) diffraction peak appears at about 2θ of 25.1q can be perfectly assigned to rGO in terms of the peak position compared with Fig. 2c and previous report [24] . The above discussion demonstrates the CuO/rGO composite was successfully synthesized.…”