| ZHONG Li,KANG Jun,WANG Zhenyang,LI Nian,ZHANG Jixiang,HAN Xi.Preparation of Oxygen-rich Porous Graphene Film and Performance of Supercapacitor[J],53(6):198-205 |
| Preparation of Oxygen-rich Porous Graphene Film and Performance of Supercapacitor |
| Revised:April 04, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.06.018 |
| KeyWord:laser-induced technology porous graphene oxygen functional group supercapacitor |
| Author | Institution |
| ZHONG Li |
School of Mechatronics and Vehicle Engineering,School of Civil Engineering, Chongqing Jiaotong University, Chongqing , China |
| KANG Jun |
School of Mechatronics and Vehicle Engineering,School of Civil Engineering, Chongqing Jiaotong University, Chongqing , China |
| WANG Zhenyang |
Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei , China |
| LI Nian |
Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei , China |
| ZHANG Jixiang |
School of Mechatronics and Vehicle Engineering,School of Civil Engineering, Chongqing Jiaotong University, Chongqing , China |
| HAN Xi |
School of Mechatronics and Vehicle Engineering,School of Civil Engineering, Chongqing Jiaotong University, Chongqing , China |
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| Abstract: |
| Graphene material is one of the most reliable electrodes for supercapacitors, which shows outstanding characteristics, such as high crystal quality, 3D net-work and large specific surface area. Among numerous methods of preparing graphene, laser-induced technology can select different carbon precursors to prepare graphene with different properties, which displays differences in electrochemical performance. Therefore, an oxygen-enriched porous graphene electrode was prepared through CO2 laser scanning by the self-made phenolic resin film with high oxygen content, which effectively improved the limited energy storage capacity of traditional laser-induced pure graphene film electrode materials and its application prospect. 6 g of phenolic resin (PR) powder and 17.5 mL of anhydrous ethanol were evenly mixed to obtain 20 mL of PR solution. Part of the ethanol was evaporated at 85 ℃ until the solution was 15 mL and the PR solution changed to PR colloid, which presented excellent film forming ability and rich oxygen content. The prepared PR colloid was made into 100 μm film on PET substrate by wire applicator. Then, the oxygen-enriched carbon precursor was scanned into graphene material by HanS CO2-D200 laser device, and the corresponding laser parameters were below:(i) laser power of 5 W; (ii) laser scanning line spacing of 0.15 mm; (iii) laser scanning speed of 30 mm/s. In addition to its own advantages, the graphene prepared under this condition also had the characteristics of oxygen enrichment. Therefore, electrochemical activation at the voltage sweep rate of 10 mV/s was selected to treat the oxygen-rich porous graphene material film. Then, the microstructure of graphene film was characterized by Gemini SEM 500 scanning electron microscope and JEM-2100 F transmission electron microscope. Apart from the morphology, the phase of graphene film was analyzed by X-ray diffractometer (X-ray diffraction of Cu Kα radiation). Raman spectra was captured by DXR Raman microscope under 532 nm laser excitation. Fourier transform infrared spectrum was captured by FT-IR spectrometer (MagnaIR 750) to explore the changes of oxygen-containing groups in graphene film before and after activation. Contact angle meter (JC2000D1, CA-D type) was used to measure the wettability before and after activation. The specific surface area of graphene film was measured by TriStarII3020M. Finally, the electrochemical workstation of CHI760E was used to analyze the properties of graphene film and assembled device. It is found that under high temperature and pressure of laser beam, a plenty of gas is released by the decomposition of phenolic resin, which will promote the formation of abundant nanopore structure inside the graphene film material. The results of nitrogen adsorption-desorption indicate that the specific surface area of the prepared graphene film reaches 324 m2/g. In addition, the transformation of the oxygen functional groups in graphene can be achieved by electrochemical activation under acidic electrolytes, and their bonding with carbon atoms also provides a more stable structure for the electrode. In the electrochemical performance test, the oxygen-containing groups provide an efficient reversible redox reaction, and deliver an area specific capacity of up to 342.8 mF/cm2 at the current density of 0.5 mA/cm2, and still retain the high value of 192 mF/cm2 at 3 mA/cm2. Compared with the graphene film not activated (12.6 mF/cm2 at 3 mA/cm2), the capacitance increases by nearly 15 times. After being assembled into a supercapacitor, it also maintains excellent energy storage characteristics and cycle stability, which demonstrates an energy density of 5.93 μWh/cm2 at a power density of 0.058 9 mW/cm2. Oxygen-rich porous graphene thin film electrode material is prepared by simple and controllable laser induction technique and electrochemical activation treatment in this work, which demonstrates its advantages of high stability and excellent specific capacitance, providing a new design for the preparation of energy storage device. |
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