caa a22 4500 477049036 CHVBK 20180405111337.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00253461 doi (NATIONALLICENCE)springer-10.1007/BF00253461 Characterization of Pt-Cu-Fe ternary electrocatalysts supported on carbon black [Elektronische Daten] [W. Roh, J. Cho, H. Kim] Ternary Pt-Cu-Fe alloy catalysts, useful for low temperature fuel cells, were prepared from aqueous media, followed by heat treatment at 900 °C for various heating periods. Supported metal crystallites were characterized with various techniques including XRD, XPS, TEM and ICP-AES. XRD patterns indicate that the lattice structure of platinum changes from a face-centred cubic to a contracted facecentred tetragonal structure as it forms an alloy. As the heating period increases, the extent of formation of an ordered alloy increases and the formation is completed in 2.5 h, as confirmed by the intensity of superlattice diffraction lines. The presence of different oxidation states is confirmed by XPS and the amount of higher oxidation state is reduced by heat-treatment, but there is no evidence of development of a new photoelectron peak or shift in binding energy by alloy formation. For the electrochemical reduction reaction of oxygen in fuel cell operation, ordered alloys have shown improved catalytic activity compared to platinum alone. After the stability test in hot phosphoric acid, the ordered structure is preserved even though a significant amount of transition metal is dissolved, and some increase in particle size in the heat-treated catalysts is observed. Chapman & Hall, 1996 Roh W. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut Cho J. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut Kim H. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/6(1996-06-01), 623-630 0021-891X 26:6<623 1996 26 10800 https://doi.org/10.1007/BF00253461 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00253461 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roh W. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut NATIONALLICENCE 700 1- Cho J. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut NATIONALLICENCE 700 1- Kim H. Department of Chemistry and Center for Molecular Catalysis, Seoul National University, San 56-1, Shinrim-dong, 151-742, Kwanak-Ku, Seoul, Korea aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/6(1996-06-01), 623-630 0021-891X 26:6<623 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer