J. C. Cruz, V. Baglio, S. Siracusano, R. Ornelas, L. Ortiz-Frade, L. G. Arriag, V. Antonucci, A. S. Aricò,
2011
Revistas indexadas
Nanosized IrO2 electrocatalysts for oxygen evolution reaction in an spe electrolyzer
6
13880764
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NO DEFINIDO
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Nanosized IrO2 electrocatalysts (d * 7?9 nm) with specific surface area up to 100 m2 g-1 were synthesized and characterized for the oxygen evolution reaction in a solid polymer electrolyte (SPE) electrolyzer. The catalysts were prepared by a colloidal method in aqueous solution and a subsequent thermal treatment. An iridium hydroxide hydrate precursor was obtained at *100 C, which was, successively, calcined at different temperatures from 200 to 500 C. The physico-chemical characterization was carried out by X-ray diffraction (XRD), thermogravimetry?differential scanning calorimetry (TG?DSC) and transmission electron microscopy (TEM). IrO2 catalysts were sprayed onto a Nafion 115 membrane up to a loading of 3 mg cm-2. A Pt catalyst was used at the cathode compartment with a loading of 0.6 mg cm-2. The electrochemical activity for water electrolysis of the membrane-electrode assemblies (MEAs) was investigated in a single cell SPE electrolyzer by steadystate polarization curves, impedance spectroscopy and chrono-amperometric measurements. A maximum current density of 1.3 A cm-2 was obtained at 1.8 V and 80 C for the IrO2 catalyst calcined at 400 C for 1 h. A stable performance was recorded in single cell for this anode catalyst at 80 C. The suitable catalytic activity and stability of the most performing catalyst were interpreted in terms of proper combination between nanostructure and suitable morphology.
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