石墨烯保护层对铜电化学腐蚀行为的影响研究

以铜箔为基底通过常压化学气相沉积法制备了高质量、连续的少层石墨烯。采用极化曲线和电化学阻抗谱对纯铜箔及石墨烯/铜样品在0.1 mol/L NaCl溶液中的抗腐蚀性能进行了研究。结果表明,石墨烯/铜样品的自腐蚀电位比纯铜箔的高0.114 V,腐蚀电流密度较纯铜箔的低1个数量级,极化电阻较纯铜箔的高4.4倍,阻抗模值比纯铜箔的提高了约1个数量级。因此,石墨烯可以作为铜表面的保护层,抑制铜在NaCl溶液中发生电化学反应,从而增强铜的抗腐蚀性能。

Effect of Graphene as Protective Layer on the Electrochemical Corrosion Behavior of Copper

High quality and continuous graphene was synthesized on Cu foil using the method of atmospheric pressure chemical vapor deposition.The corrosion resistances of pure Cu foil and graphene/Cu specimen were tested in 0.1 mol/L NaCl by potentiodynamic polarization and electrochemical impedance spectroscopy techniques.Compared with pure Cu foil, the corrosion potential of graphene/Cu moves 0.114 V towards the positive direction, but the current density of graphene/Cu decreases by an order of magnitude.And the polarization resistance of graphene/Cu is 4.4 times higher than that of pure Cu foil.The value of impedance modulus increases by about one order of magnitude.All of these results demonstrate that high quality and continuous graphene can inhibit the redox reaction occurring on the Cu foil in the electrolyte, which can increase the corrosion resistance of Cu foil and protect Cu foil from the corrosion effectively.