期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202209971
关键词
2D Coordination Polymers; Anti-Acid; Interfacial Structures; Metal Nanomaterials; Silver
资金
- National Natural Science Foundation of China [22071165, 21731002, 21975104, 22150004]
- Guangdong Major Project of Basic and Applied Research [2019B030302009]
- 111 Project [D20015]
Surface passivation technology plays a crucial role in enhancing the chemical stability of noble-metal materials. The use of two-dimensional noble-metal coordination polymers as a model system helps in understanding the surface anticorrosion mechanism. By employing a protective agent, the stability of the material can be significantly improved, with the formation of a double protective shield.
Surface passivation technology provides noble-metal materials with limited chemical stability, especially under highly acidic condition. To design effective strategy to enhance stability of noble-metal particles, an understanding of their surface anticorrosion mechanism at the atomic level is desirable by using two-dimensional (2D) noble-metal coordination polymer (CP) as an ideal model for their interfacial region. With the protection of 2-thiobenzimidazole (TBI), we isolated two Ag-based 2D CPs, {Ag-14(TBI)(12)X-2}(n) (S-X, where S denotes sheet and X=Cl or Br). These compounds exhibited excellent chemical stability upon immersion in various common solvents, boiling water, boiling ethanol, 10 % hydrogen peroxide, concentrated acid (12 M HCl), and concentrated alkali (19 M NaOH). Systematic characterization and DFT analyses demonstrate that the superior stability of S-X was attributed to the hydrophobic organic shell and dynamic proton buffer layer acting as a double protective shield.
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