title: SERS and DFT study of water on metal cathodes of silver, gold and platinum nanoparticles.
abstract: The observed surface-enhanced Raman scattering (SERS) spectra of water adsorbed on metal film electrodes of silver, gold, and platinum nanoparticles were used to infer interfacial water structures on the basis of the change of the electrochemical vibrational Stark tuning rates and the relative Raman intensity of the stretching and bending modes. To explain the increase of the relative Raman intensity ratio of the bending and stretching vibrations at the very negative potential region, density functional theory calculations provide the conceptual model. The specific enhancement effect for the bending mode was closely associated with the water adsorption structure in a hydrogen bonded configuration through its H-end binding to surface sites with large polarizability due to strong cathodic polarization. The present results allow us to propose that interfacial water molecules exist on these metal cathodes with different hydrogen bonding interactions, i.e., the HO-HH-Pt dihydrogen bond for platinum and the HO-HAg(Au) for silver and gold. This dihydrogen bonding configuration on platinum is further supported from observation of the Pt-H stretching band. Furthermore, the influences of the pH effect on SERS intensity and vibrational Stark effect on the gold electrode indicate that the O-H stretching SERS signals are enhanced in the alkaline solutions because of the hydrated hydroxide surface species adsorbed on the gold cathode.
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, China.
authors.forename: Jian-Feng
authors.initials: JF
authors.lastname: Li
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Huang
authors.forename: Sai
authors.initials: S
authors.lastname: Duan
authors.forename: Ran
authors.initials: R
authors.lastname: Pang
authors.forename: De-Yin
authors.initials: DY
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Ren
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.forename: Zhong-Qun
authors.initials: ZQ
authors.lastname: Tian
mesh_terms: D000327:Adsorption; D003198:Computer Simulation; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry; D006860:Hydrogen Bonding; D053768:Metal Nanoparticles / Q000737:chemistry*; D008956:Models, Chemical; D010984:Platinum / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014732:Vibration; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D012834:Silver; D010984:Platinum; D006046:Gold