TY - JOUR
T1 - Oxygen reduction on a high-surface area Pt/Vulcan carbon catalyst
T2 - A thin-film rotating ring-disk electrode study
AU - Paulus, U. A.
AU - Schmidt, T. J.
AU - Gasteiger, H. A.
AU - Behm, R. J.
N1 - Funding Information:
We thank A. Rämisch and K. Kraft for the glass cells and the express repairs. Furthermore we wish to acknowledge E-TEK (J. Giallombardo) and Degussa AG as well as Hochtemperatur Werkstoffe GmbH for the donation of the catalyst, platinum wire and glassy carbon substrates, respectively. Financial support for this work came from the Ulmer Universitätsgesellschaft, the Stiftung Energieforschung Baden-Württemberg (#A00009696) and the state of Baden-Württemberg, within the joint research project ‘Methanol Fuel Cells’.
PY - 2001/1/5
Y1 - 2001/1/5
N2 - We describe the adaptation of the recently developed thin-film rotating disk electrode method and its application in a rotating ring disk configuration (RRDE) to the investigation of the oxygen reduction reaction (orr) on a supported catalyst powder (Pt/Vulcan XC 72 carbon). This allows the determination of kinetic data, such as reaction orders or apparent activation energies, for the orr directly without mathematical modeling. Collection experiments reveal a potential and rotation rate independent collection efficiency. RRDE measurements allow, for the first time, the direct determination of the fraction of peroxide production during oxygen reduction on supported catalysts. Finally, comparison of measurements in 0.5 M H2SO4 and 0.5 M HClO4, respectively, reveals a significant effect of (bi)sulfate adsorption on the orr activity. On the basis of the present results, predictions are made on the kinetic limit of the orr in polymer electrolyte fuel cells, in the absence of ohmic and mass transport resistances at 100% utilization.
AB - We describe the adaptation of the recently developed thin-film rotating disk electrode method and its application in a rotating ring disk configuration (RRDE) to the investigation of the oxygen reduction reaction (orr) on a supported catalyst powder (Pt/Vulcan XC 72 carbon). This allows the determination of kinetic data, such as reaction orders or apparent activation energies, for the orr directly without mathematical modeling. Collection experiments reveal a potential and rotation rate independent collection efficiency. RRDE measurements allow, for the first time, the direct determination of the fraction of peroxide production during oxygen reduction on supported catalysts. Finally, comparison of measurements in 0.5 M H2SO4 and 0.5 M HClO4, respectively, reveals a significant effect of (bi)sulfate adsorption on the orr activity. On the basis of the present results, predictions are made on the kinetic limit of the orr in polymer electrolyte fuel cells, in the absence of ohmic and mass transport resistances at 100% utilization.
KW - Oxygen reduction
KW - Platinum
KW - Rotating ring-disk electrode
UR - http://www.scopus.com/inward/record.url?scp=0035808152&partnerID=8YFLogxK
U2 - 10.1016/S0022-0728(00)00407-1
DO - 10.1016/S0022-0728(00)00407-1
M3 - Article
AN - SCOPUS:0035808152
SN - 0022-0728
VL - 495
SP - 134
EP - 145
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -