On the Structure of Carbon-Supported Selenium-Modified Ruthenium Nanoparticles as Electrocatalysts for Oxygen Reduction in Fuel Cells

• Published in: Angewandte Chemie (International ed.) Vol. 46; no. 38; pp. 7311 - 7314
• Main Authors: Zehl, Gerald, Schmithals, Gerrit, Hoell, Armin, Haas, Sylvio, Hartnig, Christoph, Dorbandt, Iris, Bogdanoff, Peter, Fiechter, Sebastian
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley-VCH Verlag 01.01.2007; WILEY-VCH Verlag; WILEY‐VCH Verlag
• Subjects: fuel cells; heterogeneous catalysis; ruthenium; selenium; X-ray scattering
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.200701473

Particles on particles on particles: RuSexOy electrocatalysts with a cluster‐like distribution of selenium on the surface of carbon‐black‐supported ruthenium nanoparticles are suitable replacements for platinum at the cathode side of methanol fuel cells. Carbon‐supported RuSexOy nanoparticles are not completely covered by Se after reductive annealing at 800 °C; rather, Se clusters form on the Ru nanoparticles, while the rest of the surface is covered by oxygen.