Mao Xinyu, Zhu Liqun, Liu Huicong, Chen Haining, Ju Pengfei, Li Weiping
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China
Shanghai Aerospace Equipment Manufacture Shanghai 200245 China.
RSC Adv. 2019 Nov 1;9(61):35524-35531. doi: 10.1039/c9ra06541e. eCollection 2019 Oct 31.
Directly dispersing graphene into an electrolyte still remains a crucial difficulty in electrodepositing a graphene enhanced composite coating onto electrical contact materials. Herein, graphene was synthesized electrochemical exfoliation in an ,-dimethylformamide (DMF)/HO solution containing (NH)SO. The electrochemically exfoliated graphene nanosheets (GNs) were directly dispersed by sonication. In comparison with graphene synthesized from aqueous solution, the GNs electrochemically exfoliated in the DMF/HO-(NH)SO solution exhibit a lower degree of oxidation. Cu/graphene composite coatings were subsequently electrodeposited onto Cu foils by adding Cu into the as-fabricated graphene solution. The surface nanostructure of the Cu/graphene composite coatings was transformed from loose pine needles to a uniform and compact structure with an increase in the concentration of Cu, which indicated that the controllable synthesis of Cu/graphene composite coatings with different performances could be achieved in graphene dispersions after adding Cu. In order to synthesize graphene electrochemical exfoliation and directly electrodeposit a Cu/graphene composite coating without adding CuSO or any other additive, an attempt was made to directly electrodeposit a Cu/graphene composite coating in CuSO/DMF/HO solution after electrochemical exfoliation.
将石墨烯直接分散到电解质中仍然是在电接触材料上电沉积石墨烯增强复合涂层的一个关键难题。在此，石墨烯是在含有(NH₄)₂SO₄的N,N-二甲基甲酰胺(DMF)/H₂O溶液中通过电化学剥离合成的。通过超声处理将电化学剥离的石墨烯纳米片(GNs)直接分散。与从水溶液中合成的石墨烯相比，在DMF/H₂O-(NH₄)₂SO₄溶液中电化学剥离的GNs表现出较低的氧化程度。随后通过向制备好的石墨烯溶液中添加Cu²⁺，将Cu/石墨烯复合涂层电沉积到铜箔上。随着Cu²⁺浓度的增加，Cu/石墨烯复合涂层的表面纳米结构从松散的松针状转变为均匀致密的结构，这表明在添加Cu²⁺后，在石墨烯分散体中可以实现具有不同性能的Cu/石墨烯复合涂层的可控合成。为了在不添加CuSO₄或任何其他添加剂的情况下通过电化学剥离合成石墨烯并直接电沉积Cu/石墨烯复合涂层，尝试在电化学剥离后在CuSO₄/DMF/H₂O溶液中直接电沉积Cu/石墨烯复合涂层。
