TY - GEN
T1 - Improvement in activity of highly durable silica-coated Pd/CNT cathode catalysts for PEFC by addition of Cu
AU - Takenaka, Sakae
AU - Miyata, Hiroyuki
AU - Tsukamoto, Tomoharu
AU - Matsune, Hideki
AU - Kishida, Masahiro
PY - 2013
Y1 - 2013
N2 - We have previously demonstrated that silica-coated Pd cathode catalysts show high durability under severe cathode conditions in polymer electrolyte fuel cells (PEFCs), while Pd catalysts without silica-coating seriously deactivate under the same conditions due to the dissolution of Pd metal. However, the activity of silica-coated Pd catalysts for the oxygen reduction reaction (ORR) was inferior to that of Pt catalysts used in state of the art PEFCs. In the present study, the ORR activity of Pd catalysts was improved by addition of Cu. Cu-added Pd catalyst prepared with a conventional impregnation method using mixed aqueous solutions of PdCl2 and Cu(NO3)2 had an ORR activity twice that of Pd catalysts. XRD and XAFS studies showed alloy formation between Pd and Cu. Thus, Pd-Cu alloys showed higher activity for the ORR compared with Pd metal.
AB - We have previously demonstrated that silica-coated Pd cathode catalysts show high durability under severe cathode conditions in polymer electrolyte fuel cells (PEFCs), while Pd catalysts without silica-coating seriously deactivate under the same conditions due to the dissolution of Pd metal. However, the activity of silica-coated Pd catalysts for the oxygen reduction reaction (ORR) was inferior to that of Pt catalysts used in state of the art PEFCs. In the present study, the ORR activity of Pd catalysts was improved by addition of Cu. Cu-added Pd catalyst prepared with a conventional impregnation method using mixed aqueous solutions of PdCl2 and Cu(NO3)2 had an ORR activity twice that of Pd catalysts. XRD and XAFS studies showed alloy formation between Pd and Cu. Thus, Pd-Cu alloys showed higher activity for the ORR compared with Pd metal.
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U2 - 10.1149/05002.1715ecst
DO - 10.1149/05002.1715ecst
M3 - Conference contribution
AN - SCOPUS:84885694622
SN - 9781607683506
T3 - ECS Transactions
SP - 1715
EP - 1722
BT - Polymer Electrolyte Fuel Cells 12, PEFC 2012
PB - Electrochemical Society Inc.
T2 - 12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting
Y2 - 7 October 2012 through 12 October 2012
ER -