TY - JOUR

T1 - Dynamic behavior of a PEM fuel cell during electrochemical CO oxidation on a PtRu anode

AU - Lu, Hui

AU - Rihko-Struckmann, Liisa

AU - Hanke-Rauschenbach, Richard

AU - Sundmacher, Kai

N1 - Funding information: Dr. Hui Lu is grateful for a Max Planck Scholarship from the Max-Planck-Gesellschaft (MPG). The financial support obtained from the co-operation project ProBio between the Max Planck Society and Fraunhofer Society is gratefully acknowledged.

PY - 2008/12

Y1 - 2008/12

N2 - The dynamic behaviour of a single PEM fuel cell (PEMFC) with a PtRu/C anode catalyst using CO containing H2 as anode feed was investigated at ambient temperature. The autonomous oscillations of the cell potential were observed during the galvanostatic operation with hydrogen anode feed containing CO up to 1000 ppm. The oscillations were ascribed to the coupling of the adsorption of CO (the poisoning step) and the subsequent electrochemical oxidation of CO (the regeneration step) on the anode catalyst. The oscillations were dependent on the CO concentration of the feed gas and the applied current density. Furthermore, it was found that with CO containing feed gas, the time average power output was remarkably higher under potential oscillatory conditions in the galvanostatic mode than during potentiostatic operation. Accompanying these self-sustained potential oscillations, oscillation patterns of the anode outlet CO concentration were also detected at low current density (<100 mA/cm2). The online measurements of the anode outlet CO concentrations revealed that CO in the anode CO/H2 feed was partially electrochemically removed during galvanostatic operation. More than 90% CO conversion was obtained at the current densities above 125 mA/cm2 with low feed flow rates (100-200 mL/min).

AB - The dynamic behaviour of a single PEM fuel cell (PEMFC) with a PtRu/C anode catalyst using CO containing H2 as anode feed was investigated at ambient temperature. The autonomous oscillations of the cell potential were observed during the galvanostatic operation with hydrogen anode feed containing CO up to 1000 ppm. The oscillations were ascribed to the coupling of the adsorption of CO (the poisoning step) and the subsequent electrochemical oxidation of CO (the regeneration step) on the anode catalyst. The oscillations were dependent on the CO concentration of the feed gas and the applied current density. Furthermore, it was found that with CO containing feed gas, the time average power output was remarkably higher under potential oscillatory conditions in the galvanostatic mode than during potentiostatic operation. Accompanying these self-sustained potential oscillations, oscillation patterns of the anode outlet CO concentration were also detected at low current density (<100 mA/cm2). The online measurements of the anode outlet CO concentrations revealed that CO in the anode CO/H2 feed was partially electrochemically removed during galvanostatic operation. More than 90% CO conversion was obtained at the current densities above 125 mA/cm2 with low feed flow rates (100-200 mL/min).

KW - Electrochemical CO removal

KW - PEMFCs

KW - Potential oscillations

KW - Electrochemical CO removal

KW - PEMFCs

KW - Potential oscillations

KW - Catalyst poisoning

KW - Catalyst regeneration

KW - Current density

KW - Hydrogen

KW - Proton exchange membrane fuel cells (PEMFC)

UR - http://www.scopus.com/inward/record.url?scp=57049084650&partnerID=8YFLogxK

U2 - 10.1007/s11244-008-9117-9

DO - 10.1007/s11244-008-9117-9

M3 - Article

AN - SCOPUS:57049084650

VL - 2008

SP - 89

EP - 97

JO - Topics in catalysis

JF - Topics in catalysis

SN - 1022-5528

IS - 51

ER -