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oai:riubu.ubu.es:10259/53352022-04-07T13:12:12Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845

Effect of chloride and pH on the electrochemical surface oxidation enhanced Raman scattering Perales Rondon, Juan Víctor Hernández Muñoz, Sheila Heras Vidaurre, Aránzazu Colina Santamaría, Álvaro Silver Spectroelectrochemistry Raman enhancement Nanostructures Química analítica Chemistry, Analytic In the present work, electrochemical surface oxidation enhanced Raman scattering (EC-SOERS) was studied using time resolved Raman spectroelectrochemistry. This multiresponse technique allows us to obtain dynamic information about the processes taking place during the electrochemical oxidation of a silver substrate. EC-SOERS is particularly found in specific electrolytic conditions, namely, HClO4 0.1 M + KCl 5·10−3 M, and has a clear dependence on chloride concentration and pH, being the optimum values between 5·10−3 M and 1·10−2 M for chloride and pH = 1. In light of the results of this study, the appearance of the phenomenon is related to the modification of the electrode surface, yielding Ag/AgCl cubes as plasmonic structures, and the stability of such structures at low pH values. The results presented in this work could shed more light into the intricate EC-SOERS phenomenon which can be summarized as the increase of the Raman signal for a Raman probe molecule exclusively during the electrochemical oxidation of silver electrodes. Ministerio de Economía y Competitividad (Grants CTQ2017-83935-R-AEI/FEDERUE) and Junta de Castilla y León (Grant BU033-U16). J.V.P-R. thanks JCyL for his postdoctoral fellowship (Grant BU033-U16) 2020-06-10T09:35:10Z 2020-06-10T09:35:10Z 2019-04 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 0169-4332 http://hdl.handle.net/10259/5335 10.1016/j.apsusc.2018.12.148 eng Applied Surface Science. 2019, V. 473, p. 366-372 https://doi.org/10.1016/j.apsusc.2018.12.148 info:eu-repo/grantAgreement/MINECO/CTQ2017-83935-R Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier https://riubu.ubu.es/bitstream/10259/5335/4/Perales-ass_2019.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/4.0/ RIUBU. Repositorio Institucional de la Universidad de Burgos http://hdl.handle.net/10259/5335