Peking Univ, State Key Lab Mesoscop Phys, Sch Phys, Beijing 100871, Peoples R China.
Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China.
Inst Basic Sci, Ctr Multidimens Carbon Mat, Ulsan 44919, South Korea.
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China.
Beijing Univ Posts & Telecommun, Sch Elect Engn, Beijing 100876, Peoples R China.
Peking Univ, Electron Microscopy Lab, Sch Phys, Beijing 100871, Peoples R China.
Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China.
Peking Univ, Coll Chem & Mol Engn, Ctr Nanochem, Beijing 100871, Peoples R China.
South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China.
Ulsan Natl Inst Sci & Technol, Sch Mat Sci & Engn, Ulsan 44919, South Korea.
Peking Univ, Inst Ocean Res, Beijing 100871, Peoples R China.
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.收起