In this study, Cl-GQDs anchored into pure reduced graphene oxide (Cl-GQDs/rGO) hybrid materials were hydrothermally fabricated and characterized by various analyses. Meanwhile, P-GQDs, S-GQDs and N-GQDs were also fabricated and anchored into rGO as controls. The AFM images of Cl-GQDs, P-GQDs, N-GQDs and S-GQDs displayed the average height of 1-3nm, 1-1.5nm, 1.5-2.0nm and 4.0-4.5nm, respectively. Moreover, the absorbance and fluorescence spectra of Cl-GQDs were different from those of other doped graphene quantum dots. Cyclic voltammetry and galvanostatic charge-discharge curves were employed to analyze the capacitive performances of doped-GQDs/rGO. At the current density of 2 A/g, the capacitance of Cl-GQDs/rGO achieved 316 F/g, which was about 3 times, 2 times and 1.5 times as high as that of rGO, S or N-GQDs/rGO and P-GQDs/rGO, respectively. At the power density of 1.1 -3.3 KW/Kg, Cl-GQDs/rGO reached the energy density of 53.2 - 32.1 Wh/Kg. Electrochemical impedance spectroscopy clearly indicated that Cl-GQDs could improve the conductivity of rGO in the electrochemical reaction, resulting in superior capacitive performances.
The morphology and optical properties of simple synthesized chlorine-doped graphene quantum dots (Cl-GQDs) were synthesized by transmission electron microscopy, photoluminescence, and UV-vis spectrometry. The Cl-GQDs/In2O3 were synthesized by an ultrasonic treatment and the morphology, structure and composition, band gap, and surface area were analyzed by different techniques. The effect of the mass percentage of Cl-GQDs on the photoelectrochemical (PEC) behavior of In2O3 was investigated, and the results showed that 3 wt% Cl-GQDs could effectively improve the separation of photogenerated carriers. Moreover, the photocurrent density of 3 wt% Cl-GQDs/In2O3 was about ten times that of pure In2O3. Cyclic voltammetry measurements of Cl-GQDs/In2O3 under dark and light were compared to further investigate the capacitive effect of Cl-GQDs, and the results indicated that Cl-GQDs could store photogenerated electrons, inhibiting the recombination of electron-hole pairs. This work was expected to be helpful for enhancing the PEC performance of In2O3 and extending the application of Cl-GQDs.
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