Abstract
The high production cost and agglomeration of graphene are the primary challenges limiting the large-scale practical application of graphene-enhanced nanocomposites. In this study, graphite rods were electrochemically exfoliated in the nitric acid solution, and the undried exfoliated graphene was directly dispensed into the deposition solution. The esterification reaction of hydroxyl and carboxyl groups was blunted due to the spatial site-barrier effect of water molecules present in graphene. Irreversible agglomeration due to drying in the usual graphene preparation process was avoided, resulting in a composite electroplating solution with uniform graphene dispersion. On this basis, Ag/graphene composite coatings were electrochemically deposited. The graphene in the composite coating was uniformly distributed, and the surface was smooth and free of agglomeration. At the same time, the incorporation of graphene changed the coating grain orientation shift from (220) crystal plane to low-energy (111), (200) crystal plane orientation. The surface energy of the composite coating was dramatically reduced, the hardness was increased, and the wear resistance was significantly improved. This study provides a low-cost and high-quality solution for preparing graphene composites.
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