Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 5, Pages 1029-1034Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2006.12.017
Keywords
unitized regenerative fuel cells; Pt/IrO2 catalyst; oxygen reduction reaction; water electrolysis; bifunctional electrocatalysts
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Platinum nanoparticles were deposited on the surface of IrO2 by chemical reduction. The morphology and structure of nanostructural Pt/IrO2 composites were characterized by XRD, EDX and FE-SEM. The reduction of PtCl62- ions in sodium borohydride aqueous solu tion containing sodium dodecylbenzenesulfonate (SDBS) additive leads to a fine dispersion and high loading of platinum nanoparticles on IrO2 without serious aggregation. A slight up-shift of the 20 values in XRD patterns indicates some interaction between IrO2 and Pt nanoparticles in the sizes of ca. 10-20 nm. As bifunctional electrocatalyst for oxygen electrode, IrO2-supported Pt exhibits slightly lower oxygen reduction reaction (ORR) activity but markedly higher oxygen evolution reaction (OER) activity than a mixture of Pt and IrO2. It could be explained by the downshift of the d-band center (is an element of d) through the d-band coupling model and resulting weak O-2 molecule adsorption on Pt catalysts supported by IrO2. (c) 2006 Elsevier B.V. All rights reserved.
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