TY - GEN
T1 - An electrodeposited Pd-Co cathode catalyst for a microfabricated direct methanol fuel cell
AU - Tominaka, S.
AU - Ohta, S.
AU - Momma, T.
AU - Osaka, T.
PY - 2007
Y1 - 2007
N2 - Pd-Co was electrodeposited as a rough cathode catalyst for a direct methanol fuel cell fabricated using micro-electromechanical systems technology. Pd-Co was electrodeposited at -10 mA/cm2 for 60 s or -200 mA/cm 2 for 5 s. The deposits were evaluated with respect to microstructures, electrochemical characteristics, and fuel cell performances. As a result, oxygen reduction activity of the sample prepared at -200 mA/cm 2 was higher than that prepared at 10 mA/cm , while the electrochemically active surface areas were almost the same. Microstructures of the former and the latter were observed dendritic and flat, respectively. We conclude that the difference of oxygen reduction activity is attributed to the difference of the microstructure. In addition, we modified the dendritic sample by depositing Pd-Co at -0.75 V vs. Ag/AgCl. The modification increased open circuit potential for oxygen reduction by 30 mV from 0.70 to 0.73 V.
AB - Pd-Co was electrodeposited as a rough cathode catalyst for a direct methanol fuel cell fabricated using micro-electromechanical systems technology. Pd-Co was electrodeposited at -10 mA/cm2 for 60 s or -200 mA/cm 2 for 5 s. The deposits were evaluated with respect to microstructures, electrochemical characteristics, and fuel cell performances. As a result, oxygen reduction activity of the sample prepared at -200 mA/cm 2 was higher than that prepared at 10 mA/cm , while the electrochemically active surface areas were almost the same. Microstructures of the former and the latter were observed dendritic and flat, respectively. We conclude that the difference of oxygen reduction activity is attributed to the difference of the microstructure. In addition, we modified the dendritic sample by depositing Pd-Co at -0.75 V vs. Ag/AgCl. The modification increased open circuit potential for oxygen reduction by 30 mV from 0.70 to 0.73 V.
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U2 - 10.1149/1.2781049
DO - 10.1149/1.2781049
M3 - Conference contribution
AN - SCOPUS:41049107475
SN - 9781566775823
SN - 9781566775670
T3 - ECS Transactions
SP - 1369
EP - 1377
BT - ECS Transactions - 7th Symposium Devoted to Proton Exchange Membrane Fuel Cells
T2 - 7th Symposium Devoted to Proton Exchange Membrane Fuel Cells - 212th ECS Meeting
Y2 - 7 October 2007 through 12 October 2007
ER -