TY - JOUR
T1 - Preparation of supported Pt-Co alloy nanoparticle catalysts for the oxygen reduction reaction by coverage with silica
AU - Takenaka, Sakae
AU - Hirata, Akiko
AU - Tanabe, Eishi
AU - Matsune, Hideki
AU - Kishida, Masahiro
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (B) (No. 20360365) for the Ministry of Education, Culture, Science, Sports and Technology of Japan.
PY - 2010/9/9
Y1 - 2010/9/9
N2 - Pt-based alloy catalysts such as carbon black-supported Pt-Co catalysts (Pt-Co/CB) are used in the oxygen reduction reaction in polymer-electrolyte fuel cells (PEFCs) and are generally treated at high temperatures to allow for alloy formation. However, treatment of these catalysts at high temperatures results in serious aggregation of alloy particles. In this study, a Pt-Co/CB catalyst was covered with silica layers to inhibit the aggregation of alloy particles during treatment of the catalyst at high temperature for alloy formation. Coverage of Pt-Co/CB with silica promoted Pt-Co alloy formation with a high alloying degree and a small particle size, whereas the alloying degree of Pt-Co alloys in Pt-Co/CB without silica-coating was low, and these alloy particles were seriously aggregated during treatment at high temperature. These silica-coated Pt-Co/CB catalysts showed high activity and excellent durability for the oxygen reduction reaction.
AB - Pt-based alloy catalysts such as carbon black-supported Pt-Co catalysts (Pt-Co/CB) are used in the oxygen reduction reaction in polymer-electrolyte fuel cells (PEFCs) and are generally treated at high temperatures to allow for alloy formation. However, treatment of these catalysts at high temperatures results in serious aggregation of alloy particles. In this study, a Pt-Co/CB catalyst was covered with silica layers to inhibit the aggregation of alloy particles during treatment of the catalyst at high temperature for alloy formation. Coverage of Pt-Co/CB with silica promoted Pt-Co alloy formation with a high alloying degree and a small particle size, whereas the alloying degree of Pt-Co alloys in Pt-Co/CB without silica-coating was low, and these alloy particles were seriously aggregated during treatment at high temperature. These silica-coated Pt-Co/CB catalysts showed high activity and excellent durability for the oxygen reduction reaction.
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U2 - 10.1016/j.jcat.2010.07.005
DO - 10.1016/j.jcat.2010.07.005
M3 - Article
AN - SCOPUS:77956354886
VL - 274
SP - 228
EP - 238
JO - Journal of Catalysis
JF - Journal of Catalysis
SN - 0021-9517
IS - 2
ER -