TY - JOUR
T1 - The catalytic oxidation of carbon monoxide at the platinum/electrolyte interface investigated by optical second harmonic generation (SHG)
T2 - Comparison of Pt(111) and Pt(997) electrode surfaces
AU - Akemann, W.
AU - Friedrich, K. A.
AU - Linke, U.
AU - Stimming, U.
PY - 1998/5/15
Y1 - 1998/5/15
N2 - The anodic oxidation of CO on nominal Pt(111) and Pt(997) electrodes in a CO-saturated 0.1 M HClO4 electrolyte is studied by optical second harmonic generation (SHG) at a wavelength of 280 nm to monitor the CO adlayer under steady-state reaction conditions in the potential range between 50 mV and 1030 mV vs. RHE. Regarding the catalytic activity of the electrodes, two potential regimes are distinguishable: in the low potential regime, characterized by the presence of a dense CO overlayer, the reaction yield is higher on Pt(997) than on Pt(111). Positive of the overlayer stripping potential [880 mV for Pt(111) and 780 mV for Pt(997)] the Pt(997) electrode exhibits an inferior reactivity. The results confirm the structure sensitivity of anodic CO oxidation on Pt electrode surfaces.
AB - The anodic oxidation of CO on nominal Pt(111) and Pt(997) electrodes in a CO-saturated 0.1 M HClO4 electrolyte is studied by optical second harmonic generation (SHG) at a wavelength of 280 nm to monitor the CO adlayer under steady-state reaction conditions in the potential range between 50 mV and 1030 mV vs. RHE. Regarding the catalytic activity of the electrodes, two potential regimes are distinguishable: in the low potential regime, characterized by the presence of a dense CO overlayer, the reaction yield is higher on Pt(997) than on Pt(111). Positive of the overlayer stripping potential [880 mV for Pt(111) and 780 mV for Pt(997)] the Pt(997) electrode exhibits an inferior reactivity. The results confirm the structure sensitivity of anodic CO oxidation on Pt electrode surfaces.
KW - Carbon monoxide
KW - Electrochemical methods
KW - Molecule-solid reactions
KW - Oxidation
KW - Platinum
KW - Second harmonic generation
KW - Single crystal surfaces
KW - Solid-liquid interfaces
KW - Surface chemical reaction
UR - http://www.scopus.com/inward/record.url?scp=0031630005&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(97)01043-1
DO - 10.1016/S0039-6028(97)01043-1
M3 - Article
AN - SCOPUS:0031630005
SN - 0039-6028
VL - 402-404
SP - 571
EP - 575
JO - Surface Science
JF - Surface Science
ER -