Abstract
We use optical sum-frequency generation to investigate the stretching vibrations of cyanide (CN−) molecules chemisorbed from aqueous electrolytes on single-crystalline Pt(111)- and Pt(110)-electrode surfaces. For clean and well-ordered Pt(111) electrodes, a single vibrational band between 2080 and 2150 cm−1 with a nonlinear frequency dependence on the potential is observed and assigned to the C≡N stretching vibration of chemisorbed cyanide. A second band between 2145 and 2150 cm−1 with very weak potential dependence appears on a surface which was subjected to oxidation-reduction cycles and is attributed to cyanide associated with a microscopically disordered surface. This assignment is supported by preliminary results for a Pt(110) single-crystal electrode. On a well-ordered (110) surface a single and potential-dependent cyanide vibration between 2070 and 2112 cm−1 is observed. After oxidation of the cyanide and readsorption, this band is replaced by a higher frequency band at 2144 cm−1 which is essentially not potential-dependent. Occasionally, additional vibrational bands at lower frequencies not reported in corresponding IR studies are observed on Pt(111).
Similar content being viewed by others
References
M. Fleischmann, I.R. Hill: In Surface Enhanced Raman Scattering, ed. by R.K. Chang, T.E. Furtak (Plenum, New York 1982) pp. 275–292
R.E. Benner, R. Dornhaus, R.K. Chang, B.L. Laube: Surf. Sci. 101, 341 (1980)
R. Dornhaus, M.B. Long, R.E. Benner, R.K. Chang: Surf. Sci. 93, 240 (1980)
K. Kunimatsu, H. Seki, W.G. Golden: Chem. Phys. Lett. 108, 195 (1984)
K. Kunimatsu, H. Seki, W.G. Golden, J.G. Gordon II, M.R. Philpott: Surf. Sci. 158, 596 (1985)
K. Ashley, S. Pons: Chem. Rev. 88, 673 (1988)
L.H. Leung, A. Wieckowski, M.J. Weaver: J. Phys. Chem. 92, 6985 (1988)
X.-D. Zhu, H. Suhr, Y.R. Shen: Phys. Rev. B 35, 3047 (1987)
J.H. Hunt, P. Guyot-Sionnest, Y.R. Shen: Chem. Phys. Lett. 133, 189 (1987)
P. Guyot-Sionnest, J.H. Hunt, Y.R. Shen: Phys. Rev. Lett. 59, 1597 (1987)
A.L. Harris, C.E.D. Chidsey, N.J. Levinos, D.N. Loiacono: Chem. Phys. Lett. 141, 350 (1987)
P. Guyot-Sionnest, A. Tadjeddine: Chem. Phys. Lett. 172, 341 (1990)
V.B. Paulissen, C. Korzeniewski: J. Phys. Chem. 96, 4563 (1992)
C.S. Kim, C. Korzeniewski: J. Phys. Chem. 97, 9784 (1993)
C. Stuhlmann, I. Villegas, M.J. Weaver: Chem. Phys. Lett. 219, 319 (1994)
P. Guyot-Sionnest, P. Dumas, Y.J. Chabal: J. Electron Spectrosc. Relat. Phenom. 54/55, 27 (1990)
H.-J. Krause, W. Daum: Appl. Phys. B 56, 8 (1993)
We had no means to generate s-polarized tunable IR pulses
J. Clavilier, K. El Achi: J. Electroanal. Chem. 295, 33 (1990)
H. Froitzheim, H. Hopster, H. Ibach, S. Lehwald: Appl. Phys. 13, 147 (1977)
H.-J. Krebs, H. Lüth: Appl. Phys. 14, 337 (1977)
M.D. Baker, M.A. Chesters: In Vibrations at Surfaces, ed. by R. Caudano, J.-M. Gilles, A.A. Lucas (Plenum, New York 1982) pp. 289–298
B.E. Hayden, A.M. Bradshaw: Surf. Sci. 125, 787 (1983)
M. Tüshaus, E. Schweizer, P. Hollins, A.M. Bradshaw: In Vibrations at Surfaces 1987, ed. by A.M. Bradshaw, H. Conrad (Elsevier, Amsterdam 1987) pp. 305–316
G. Ertl, M. Neumann, K.M. Streit: Surf. Sci. 64, 393 (1977)
A maximum ratio IBrigde/Ilinear = 1:4.5 for the integrated intensities of the two bands was measured in our experiments, to be compared to 1:2.7 in [27]
E. Schweizer, B.N.J. Persson, M. Tüshaus, D. Hodge, A.M. Bradshaw: Surf. Sci. 213, 49 (1989)
B.E. Hayden, K. Kretzschmar, A.M. Bradshaw: Surf. Sci. 149, 394 (1985)
S.D. Rosasco, J.L. Stickney, G.N. Salaita, D.G. Frank, J.Y. Katekaru, B.C. Schardt, M.P. Soriaga, D.A. Stern, A.T. Hubbard: J. Electroanal. Chem. 188, 95 (1985)
P.S. Bagus, C.J. Nelin, K. Hermann, M.R. Philpott: Phys. Rev. B 36, 8169 (1987)
L.H. Jones, R.A. Pennemann: J. Chem. Phys. 22, 965 (1954)
K. Nakamoto: Infrared and Raman Spectra of Inorganic and Coordination Compounds (Wiley, New York 1978) pp. 259–262
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Daum, W., Friedrich, K.A., Klünker, C. et al. Sum-frequency generation at electrochemical interfaces: Cyanide vibrations on Pt(111) and Pt(110). Appl. Phys. A 59, 553–562 (1994). https://doi.org/10.1007/BF00348274
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00348274