Combined electrochemical/surface science investigations of Pt/Cr alloy electrodes Page: 3 of 21
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I. INTRODUCTION
A'.tering the surface chemical properties of a noble metal by alloying with
another transition metal has been an active area of research for both electro-
chemists [1] and surface scientists [7]. Specifically, supported PtCr alloys
have drawn considerable interest [3] as electrocatalysts possessing superior
performance to pure Pt for oxygen reduction in the phosphoric acid fuel cell.
Among the several explanations for the reported [3] enhanced electrocatalytic
activity of PtCr alloys for 02 reduction are a decrease in the bulk lattice
constant [4], the presence of a reactive species not found on pure Pt, and
simply increased Pt surf ace area. Thus, this system is interesting from both a
fundamental and practical point of view. In this work we present preliminary
results correlating electrochemical properties of bulk PtCr alloys with their
surface composition as revealed by electron spectrascopies. A full presenta-
tion of these results including similar studies made in H250 appear elsewhere
[5].
11. EXPEHIMENTAL
The PLCr alloys were made by arr melting a mixture of the pure elements
(5N pure) in an Ar atmosphere. Samples were spark cut, polished on one side
with diamond polish to a mirror finish, and uLtrasniclly cleaned. Fur puten-
tiostatic control, a PL wire was spot welded to the back of the electrode,
which was soaked in conceentrated H .,Se) to remove any Cu left from sxt wc'ldi ng.
El ect roehem Ic ( l cycl iK was performed 1 In N 30i1-m Kcal-F c.''l l . Thu re ferernc's' wain
a dynamic hydrogen electrode, -U.04':) V vs HHE [61. All potentials arc' qunt*d
witth respect to Iup;.
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Daube, K. A.; Paffett, M. T.; Gottesfeld, S. & Campbell, C. T. Combined electrochemical/surface science investigations of Pt/Cr alloy electrodes, article, January 1, 1985; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1054134/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.