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A study of the growth and CO electrooxidation behaviour of PtRh alloys on Pt{100} single crystals

Fang, L., Vidal-Iglesias, F. J., Huxter, Sharon Elizabeth and Attard, Gary Anthony 2008. A study of the growth and CO electrooxidation behaviour of PtRh alloys on Pt{100} single crystals. Journal of Electroanalytical Chemistry 622 (1) , pp. 73-78. 10.1016/j.jelechem.2008.05.003

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The formation of quasi-crystalline PtRh two dimensional films supported on Pt{1 0 0} is described. For the first time, the voltammetry of PtRh{1 0 0} single crystal alloys covering the whole range of alloy composition is reported. Synthesis follows a similar procedure to that described previously for the formation of PtPd alloys supported on Pt{h k l} but with some important provisos concerning the final annealing step. CO electrooxidation was used as a probe reaction and for certain PtRh{1 0 0} surface alloys, unusually high electrocatalytic activity was observed relative to monometallic Pt and Rh electrodes. The flame annealing of a “PtRhPt sandwich” precursor structure was found to be the best method of forming the PtRh alloy surfaces. For PtRh films annealed under nitrogen, significant phase separation was observed in agreement with previous surface science studies of PtRh adlayers on Pt{1 0 0} annealed in the absence of oxygen. In addition, an excess of Rh in the “sandwich structure” from which the alloy was formed tended to preclude good alloy formation. It is suggested that the protocols for thin film formation described may prove useful in many other important electrocatalytic systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: PtRh alloy; Pt{1 0 0} single crystal; CO electrocatalytic oxidation; Cyclic voltammetry
Publisher: Elsevier
ISSN: 1572-6657
Last Modified: 04 Jun 2017 01:55

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