Broadband Sum Frequency Generation Studies of Surface Intermediates Involved in Fuel Cell Electrocatalysis

New Concepts in the Chemistry and Engineering of Low‐Temperature Fuel Cells

“…The two illuminating beams are usually in the infrared and visible ranges. However, since the reflected infrared beam is no longer used for data analysis, the thickness of the solution film between the optical window and the working electrode surface can be extended to 25 mm [216,217]; that is, in BB-SFG, all vibrations lying within the spectral region defined by the BBIR pulse spectrum are probed simultaneously [229]. Figure 19.11 shows BB-SFG spectra of CO chemisorbed on Pt.…”

Sum-Frequency Generation Spectroscopy (SFG) at Platinum and Platinum/Ruthenium Interfaces Containing Chemisorbed Carbon Monoxide

“…Generation Spectroscopy (SFG) measurements are based upon the second-order nonlinear optical process, are inherently interface specific (1), and SFG has emerged as a powerful in-situ vibrational spectroscopy for investigating electrochemical surfaces (2,3). In the lecture, simultaneous electrochemical and vibrational sum-frequency generation (SFG) spectroscopy measurements will be reported of oxidation of carbon monoxide on Pt electrodes (polycrystalline and (111) single crystal) with both CO-free and CO-saturated electrolytes (4,5).…”