TY - JOUR
T1 - The efficiency of methanol conversion to CO2 on thin films of Pt and PtRu fuel cell catalysts
AU - Gao, Lin
AU - Huang, Huiliang
AU - Korzeniewski, Carol
N1 - Funding Information:
We gratefully acknowledge support from the Office of Navel Research, the National Science Foundation, and the Robert A. Welch Foundation.
PY - 2004/3/30
Y1 - 2004/3/30
N2 - 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.
AB - 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.
KW - Carbon dioxide
KW - Catalysts
KW - Fuel cell
KW - Methanol oxidation
UR - http://www.scopus.com/inward/record.url?scp=0742319233&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2003.07.015
DO - 10.1016/j.electacta.2003.07.015
M3 - Conference article
AN - SCOPUS:0742319233
SN - 0013-4686
VL - 49
SP - 1281
EP - 1287
JO - Electrochimica Acta
JF - Electrochimica Acta
IS - 8
T2 - Trends in Surface Electrochemistry: From Single Crystals to
Y2 - 2 March 2003 through 6 March 2003
ER -