| GUO Hui-xia,AN Jing-hua,LIANG Jun.Preparation of Graphene Oxide by Electrochemical Exfoliation and Properties of Pulsed Electrodeposited Ni-Graphene Oxide Composite Coating in Deep Eutectic Solvent[J],49(3):224-233 |
| Preparation of Graphene Oxide by Electrochemical Exfoliation and Properties of Pulsed Electrodeposited Ni-Graphene Oxide Composite Coating in Deep Eutectic Solvent |
| Received:June 19, 2019 Revised:March 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.03.028 |
| KeyWord:deep eutectic solvent electrochemical exfoliation graphene oxide Ni-GO composite coatings pulse electrodeposition |
| Author | Institution |
| GUO Hui-xia |
1.Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, School of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou , China |
| AN Jing-hua |
1.Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, School of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou , China; 2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LIANG Jun |
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| The work aims to improve corrosion resistance and tribological properties of Ni coatings by realizing electrochemical exfoliation of graphene oxide and deposition of Ni-GO composite coating in the deep eutectic solvent (DES). GO was electrochemically exfoliated in DES by DC source with graphite rod as anode and platinum foil as cathode, respectively. The Ni-GO composite coatings were prepared by pulse electrodeposition in this basic electrolyte. Microstructure and composition of GO were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Visible absorption spectroscopic (UV), Fourier transform infrared (IR), Raman spectrometer and X-ray diffractometer (XRD). The morphology of coatings was observed by SEM, structural characteristics were analyzed by XRD and XPS and corrosion resistance, mechanical properties and tribological properties of the coatings were investigated by electrochemical workstation, nano-indentation instrument and friction and wear apparatus. GO was successfully prepared by electrochemical exfoliation in DES. GO showed a large sheet structure and had wrinkles on the surface. The edges were curved, and the upper and lower surface layers contained a large amount of hydroxyl groups and epoxy groups. The performance test indicated that the corrosion current density of Ni-GO composite coating was reduced from 6.10×10-5 A/cm2 to 5.78×10-7 A/cm2, the hardness was improved from (8.95±0.43) GPa to (13.75±0.75) GPa, the elastic modulus was increased from (184.55±8.12) GPa to (201.38±11.20) GPa, the coefficient of frictional was decreased from 0.72 to 0.56 and the wear rate was reduced by 35.16%. One-step electrochemical route for preparation of GO with electrochemical exfoliation is realized in deep eutectic solvents and it can also be used for preparing Ni-GO metal-based composite coatings, which provides a new method for the preparation of uniformly dispersed graphene oxide and the preparation of metal-based composite coatings. Compared with pure Ni coating, Ni-GO composite coating prepared by the electrolyte has the advantages of refined crystal grains, enhanced corrosion resistance, improved mechanical properties, reduced friction coefficient and increased wear resistance. |
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