Yields were determined for the CO2 produced upon the electrochemical oxidation of 1.0 M methanol in 0.1 M HClO4 at the following four fuel cell catalyst systems: Pt black, Pt at 10 wt.% metal loading on Vulcan XC-72R carbon (C/Pt, 10%), PtRu black at 50 at.% Pt, 50 at.% Ru (PtRu (50:50) black), and PtRu at 30 wt.% Pt, 15 wt.% Ru loading on Vulcan XC-72R carbon (C/PtRu, 30 wt.% Pt, 15 wt.% Ru). Samples were electrolyzed in a small volume (50 μl) arrangement for a period of 180 s keeping the reactant depletion in the cell below 1%. The dissolved CO2 produced was determined ex situ by infrared spectroscopy in a micro-volume transmission flow cell. For the PtRu materials, the efficiencies for CO2 formation were near 100% at reaction potentials in the range between 0.4 V (versus the reversible hydrogen electrode (RHE), VRHE) and 0.9 VRHE. At the Pt catalysts, the yields of CO2 approached 80% between 0.8 and 1.1 VRHE and declined rapidly below 0.8VRHE.
|Number of pages||7|
|State||Published - Mar 30 2004|
|Event||Trends in Surface Electrochemistry: From Single Crystals to - Alicante, Spain|
Duration: Mar 2 2003 → Mar 6 2003
- Carbon dioxide
- Fuel cell
- Methanol oxidation