| Graphene,as a new type of two-dimensional carbon material,has attracted the attention and interest of researchers since it was discovered.Graphene has been applied in many fields due to its excellent electrical properties,barrier properties,large specific surface area,and stable chemical properties.By functional modification of graphene,the novel functional graphene material could be obtained basing on the excellent performance of graphene.In recent years,the application of graphene has shown great potential in many fields,among them,the application in corrosion protection and fuel cells was particularly arresting.This paper focused on the preparation and process optimization of graphene functionalized materials,as well as the properties and applications of the modified graphene materials in the fields of corrosion protection and electro-catalyzed oxygen reduction.A layer of ferro-tungsten coating was deposited on the substrate by DC electroplating,and then BTESPT with dual silicon atoms was selected as a coupling agent.After being mixed with graphene oxide,an even and dense composite film was successfully prepared on the coating by electrophoretic deposition.The results showed that the graphene oxide was successfully reduced and introduced into the composite film.The silane acted as a molecular bridge to bond the graphene and the metal substrate in the form of covalent bonds,forming a complete protective film.By electrochemical characterization of the layers with different graphene content,it was found that when the concentration of graphene oxide added was 0.4 mg/ml,the film was relatively uniform and the thickness was about 0.94μm.The film possessed a large resistance value（646.96 kΩ）,a self-corrosion potential of-0.558 V and a corrosion current density of 7.805×10-9 A·cm-2 in NaCl solution,the corrosion property was significantly increased comparing to the conventional silane film.On this basis,by tuning the current density of iron-tungsten DC electroplating,the surface morphology and roughness of the coating were controlled,and a perfluorosilane was deposited on the surface of the coating to achieve the hydrophobic modification.The optical water contact angle test showed that the water contact angle of the hydrophobically modified composite membrane was 141.7°,when applied current density was 500 mA·cm-2,which was close to the superhydrophobic surface（150°）.On the other hand,a transition metal-doped graphene aerogel was synthesized by a one-step hydrothermal method,and it was nitrogen-doped by vacuum high temperature ammonia treatment.The results showed that the nitrogen and transition metal nanoparticles were evenly distributed on the graphene sheets,and the maximum of doping nitrogen was 8.16 at.%.The co-doping of Ni and Fe achieved a synergistic enhancement in the oxygen catalytic reduction,the ultimate current density of the corresponding catalyst was 4.01 mA·cm-2 and the average electron transfer number was 3.95.The electrocatalytic performance was significantly superior to the commercial platinum carbon catalysts. |
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