The rate constants for oxygen dissolution on bare and oxide-covered platinum
1966; Elsevier BV; Volume: 11; Issue: 3 Linguagem: Inglês
10.1016/0013-4686(66)87048-2
ISSN1873-3859
AutoresA. Damjanović, J. O’M. Bockris,
Tópico(s)Catalytic Processes in Materials Science
ResumoVarious Pt-carbonyl cluster complexes ([Pt3(CO)3(μ-CO)3]n2- (n = 3–8)) were prepared by simply bubbling CO through PtCl62- solutions with different solvents. The number of layered Pt3(CO)3(μ-CO)3 units (n) was independent of water content and the length of the alkyl chain of the solvent, but it increased with a decrease in the permittivity of the solvent. The Pt-carbonyl cluster complexes were applied to the preparation of Pt-nanoparticle-loaded carbon black (Pt/CB). The mean size of the resultant Pt nanoparticles increased with n, whereas their size distribution remained narrow (±0.3 nm) irrespective of n. For the oxygen reduction reaction, the specific activity (SA) of each Pt/CB catalyst was almost equivalent to that of the Pt/CB catalyst produced by Tanaka Kikinzoku Kogyo (Pt/CB-TKK). Meanwhile, the mass activity (MA), the product of SA and real specific surface area (SSAreal), at 0.9 V of each Pt/CB catalyst was superior to that of Pt/CB-TKK because the SSAreal evaluated experimentally for the Pt/CB catalysts was higher than that for the Pt/CB-TKK. In particular, the MA at 0.9 V of the Pt/CB catalyst (Pt-et(50)/CB) prepared from [Pt3(CO)3(μ-CO)3]52- synthesized in ethanol–water (50:50 v/v) was about 1.7 and 2.0 times higher than those of commercial Pt/CB-TKK and E-TEK catalysts, respectively.
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