Oxygen reduction at chalcogenide model surfaces

• Applicant: Professor Dr. Helmut Baltruschat
• Subject Area: Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: from 2010 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 184693688

• Final Report Year: 2017

Final Report Abstract

The surface chemistry of Se modified surface is very rich, but also rather complicated. STM results were very helpful not only for the analysis of the atomic structure of an adsorbed Se monolayer on Rh(111), but also for the understanding the coverage and potential dependent structural changes including place exchange. Unfortunately, in the limited time (and with only one PhD student) we were not yet able to establish a reliable method to determine the number of free Ru sites on a heat treated Rh surface or the surface Se concentration. Such surfaces seem to have interesting catalytic activities: not only is the oxygen reduction shifted by 80 mV in positive direction (which is still far from the activity of Pt), but also the hydrogen evolution and oxidation of adsorbed CO resembles that of Pt. I believe we laid the basis for future necessary research on this topic.

Publications

• (2018) Oxygen Reduction on Rh(111) and Se-Modified Rh(111) Surfaces. Electrocatalysis 9 (1) 40–46
  Iqbal, Shahid; Baltruschat, Helmut
  (See online at https://doi.org/10.1007/s12678-017-0407-5)
• (2018) Surface morphology and adlayer structure of Se on Rh(111). Physical chemistry chemical physics : PCCP 20 (9) 6176–6186
  Iqbal, Shahid; Zan, Lingxing; Nardi, Elena; Baltruschat, Helmut
  (See online at https://doi.org/10.1039/C7CP07294E)
• "Surface morphological studies of Nafion®/Pt(100) interface". Electrochimica Acta 144 (2014) 141-146
  S. Iqbal, N. Podgaynyy, M. Ahmed, G. A. Attard and H. Baltruschat
  (See online at https://doi.org/10.1016/j.electacta.2014.08.086)
• Quantitative Determination of H2Se at Model Metal fcc(111) Selenide Surface: DEMS, STM, and AFM Studies, J. Phys. Chem. C 2015, 119, 20515−20523
  Shahid Iqbal, Christoph Bondü and Helmut Baltruschat
  (See online at https://doi.org/10.1021/acs.jpcc.5b06635)
• “Selenium modification of Rh(111) surfaces - Structure and electroactivity for oxygen reduction” Rheinischen Friedrich-Wilhelms-Universität Bonn, Bonn, 2015
  Shahid Iqbal