Electrocatalysis

, Volume 4, Issue 2, pp 101–103 | Cite as

Chemisorption-Isotherm Measurements at Electrode Surfaces by Quantitative High-Resolution Electron Energy Loss Spectroscopy

  • Jean Sanabria-Chinchilla
  • Xiaole Chen
  • Ding Li
  • Manuel P. Soriaga
Article

Abstract

The chemisorption isotherm of benzoquinone at a well-defined Pd(100) surface was obtained by quantitative high-resolution electron energy loss spectroscopy (HREELS). Extraction of surface-coverage information from HREELS required the normalization of integrated peak intensities to compensate for differences in the backscattered electron flux brought about by the organic adlayer. A common procedure rests on a match of the elastic-peak heights, but it fails for organic adsorbates since those introduce surface roughness that result in a higher stream of inelastically scattered electrons. A more accurate method is based on the equalization of the incident electron beam currents. This is attained only when the background intensities integrated over a peak-free spectral region are set equal to one another. The HREELS-generated isotherm was compared with that acquired by thin-layer electrochemical measurements; excellent agreement was observed.

Keywords

High-resolution electron energy loss spectroscopy Chemisorption isotherms Surface coverage measurements by HREELS Background-intensity normalization of HREEL spectra HREELS of benzoquinone chemisorbed on Pd(100) electrodes 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Jean Sanabria-Chinchilla
    • 1
  • Xiaole Chen
    • 2
  • Ding Li
    • 2
  • Manuel P. Soriaga
    • 1
    • 2
  1. 1.Joint Center for Artificial Photosynthesis, Division of Chemistry and Chemical EngineeringCalifornia Institute of TechnologyPasadenaUSA
  2. 2.Department of ChemistryTexas A&M UniversityCollege StationUSA

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