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Greatly Enhanced Anticorrosion of Cu by Commensurate Graphene Coating
Advanced Materials ( IF 27.4 ) Pub Date : 2017-12-20 , DOI: 10.1002/adma.201702944 Xiaozhi Xu 1, 2 , Ding Yi 3 , Zhichang Wang 4 , Jiachen Yu 1 , Zhihong Zhang 1, 2 , Ruixi Qiao 1 , Zhanghao Sun 1 , Zonghai Hu 5 , Peng Gao 6, 7 , Hailin Peng 8 , Zhongfan Liu 8 , Dapeng Yu 1, 7, 9 , Enge Wang 4, 7 , Ying Jiang 4, 7 , Feng Ding 3, 10 , Kaihui Liu 1, 2, 4, 7, 11
Advanced Materials ( IF 27.4 ) Pub Date : 2017-12-20 , DOI: 10.1002/adma.201702944 Xiaozhi Xu 1, 2 , Ding Yi 3 , Zhichang Wang 4 , Jiachen Yu 1 , Zhihong Zhang 1, 2 , Ruixi Qiao 1 , Zhanghao Sun 1 , Zonghai Hu 5 , Peng Gao 6, 7 , Hailin Peng 8 , Zhongfan Liu 8 , Dapeng Yu 1, 7, 9 , Enge Wang 4, 7 , Ying Jiang 4, 7 , Feng Ding 3, 10 , Kaihui Liu 1, 2, 4, 7, 11
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Metal corrosion is a long‐lasting problem in history and ultrahigh anticorrosion is one ultimate pursuit in the metal‐related industry. Graphene, in principle, can be a revolutionary material for anticorrosion due to its excellent impermeability to any molecule or ion (except for protons). However, in real applications, it is found that the metallic graphene forms an electrochemical circuit with the protected metals to accelerate the corrosion once the corrosive fluids leaks into the interface. Therefore, whether graphene can be used as an excellent anticorrosion material is under intense debate now. Here, graphene‐coated Cu is employed to investigate the facet‐dependent anticorrosion of metals. It is demonstrated that as‐grown graphene can protect Cu(111) surface from oxidation in humid air lasting for more than 2.5 years, in sharp contrast with the accelerated oxidation of graphene‐coated Cu(100) surface. Further atomic‐scale characterization and ab initio calculations reveal that the strong interfacial coupling of the commensurate graphene/Cu(111) prevents H2O diffusion into the graphene/Cu(111) interface, but the one‐dimensional wrinkles formed in the incommensurate graphene on Cu(100) can facilitate the H2O diffusion at the interface. This study resolves the contradiction on the anticorrosion capacity of graphene and opens a new opportunity for ultrahigh metal anticorrosion through commensurate graphene coating.
中文翻译：
相应的石墨烯涂层极大地增强了铜的防腐性能
金属腐蚀是历史上长期存在的问题，超高防腐是金属相关行业的终极追求之一。石墨烯原则上可以成为抗腐蚀的革命性材料，因为它对任何分子或离子（质子除外）具有出色的不渗透性。但是，在实际应用中，发现金属石墨烯与受保护的金属形成电化学回路，一旦腐蚀性流体泄漏到界面中，就会加速腐蚀。因此，石墨烯是否可以用作优良的防腐材料，目前正处于激烈的争论之中。在这里，石墨烯涂层的铜被用来研究金属的刻面依赖性防腐。结果表明，石墨烯可以保护Cu（111）表面免受潮湿空气中超过2.5年的氧化，与石墨烯包覆的Cu（100）表面的加速氧化形成鲜明对比。进一步的原子尺度表征和从头算计算表明，相称的石墨烯/ Cu（111）的强界面耦合可防止氢2 O扩散到石墨烯/ Cu（111）界面中，但是在Cu（100）上不相称的石墨烯中形成的一维皱纹可以促进H 2 O在界面上的扩散。这项研究解决了石墨烯防腐能力的矛盾，并通过相应的石墨烯涂层开辟了超高金属防腐的新机会。
更新日期：2017-12-20
中文翻译：
相应的石墨烯涂层极大地增强了铜的防腐性能
金属腐蚀是历史上长期存在的问题，超高防腐是金属相关行业的终极追求之一。石墨烯原则上可以成为抗腐蚀的革命性材料，因为它对任何分子或离子（质子除外）具有出色的不渗透性。但是，在实际应用中，发现金属石墨烯与受保护的金属形成电化学回路，一旦腐蚀性流体泄漏到界面中，就会加速腐蚀。因此，石墨烯是否可以用作优良的防腐材料，目前正处于激烈的争论之中。在这里，石墨烯涂层的铜被用来研究金属的刻面依赖性防腐。结果表明，石墨烯可以保护Cu（111）表面免受潮湿空气中超过2.5年的氧化，与石墨烯包覆的Cu（100）表面的加速氧化形成鲜明对比。进一步的原子尺度表征和从头算计算表明，相称的石墨烯/ Cu（111）的强界面耦合可防止氢2 O扩散到石墨烯/ Cu（111）界面中，但是在Cu（100）上不相称的石墨烯中形成的一维皱纹可以促进H 2 O在界面上的扩散。这项研究解决了石墨烯防腐能力的矛盾，并通过相应的石墨烯涂层开辟了超高金属防腐的新机会。
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