Durability of carbon-supported manganese oxide nanoparticles for the oxygen reduction reaction (ORR) in alkaline medium

0340216 - ÚACH 2010 RIV GB eng J - Journal Article
Roche, I. - Chainet, E. - Chatenet, M. - Vondrák, Jiří
Durability of carbon-supported manganese oxide nanoparticles for the oxygen reduction reaction (ORR) in alkaline medium.
Journal of Applied Electrochemistry. Roč. 38, č. 9 (2008), s. 1195-1201. ISSN 0021-891X. E-ISSN 1572-8838
R&D Projects: GA AV ČR KJB4813302; GA ČR GA104/02/0731
Grant - others:CNRS(FR) 18105
Institutional research plan: CEZ:AV0Z40320502
Keywords : oxygen reduction reaction * rotating ring-disc electrode * carbon-supported manganese oxide
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.540, year: 2008

MnOx/C-based electrocatalysts, prepared by the chemical deposition of manganese oxide nanoparticles on carbon, were tested towards the Oxygen Reduction Reaction (ORR) in their as-synthesized state and after ageing, either in ambient air for a year (mild ageing) or in an O-2-saturated molar KOH solution at 80 degrees C for three weeks (premature ageing). For each electrocatalyst, the morphology and composition were characterised using TEM, XRD and chemical analysis. ORR kinetic parameters were evaluated using the Rotating Disk Electrode (RDE) and Rotating Ring Disk Electrode (RRDE) setups. Whilst the oxygen reduction activity of the electrocatalysts barely changes after mild ageing, it decreases after premature ageing following dramatic modifications to both the chemical and crystalline structures of the carbon-supported MnOx nanoparticles. The peroxide yield also sharply increases after premature ageing.
Permanent Link: http://hdl.handle.net/11104/0183506