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Supporting IrO2 and IrRuOx nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction

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Journal of Energy Chemistry 2019年第7期28卷 227-239页

作者： Radostina V.Genova-Koleva Francisco Alcaide Garbine Alvarez Pere L.Cabot Hans-Jürgen Grande mar.a V.mar.ínez-Huerta Oscar Miguel CIDETEC P°Miramon19620014 San SebastianSpain Laboratory of Electrochemistry of Materials and the Environment Department of Materials Science and Physical ChemistryUniversitat de BarcelonaMarti i Franques 1-1108028 BarcelonaSpain Instituto de Catálisis y Petroleoquimica CSICC/Marie Curie228049 Madrid.Spain

IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and characterized by means of structural,surface analytical and electrochemical *** doping of titania significantly increased the surface area of the support from 145(TNTs)to 260 m2g-1(Nb-TNTs),which was significantly higher than those of the Nb-doped titania supports previously reported in the *** surface analytical techniques showed good dispersion of the catalysts onto the *** X-ray photoelectron spectroscopy analyses showed that Nb was mainly in the form of Nb(IV)species,the suitable form to behave as a donor introducing free electrons to the conduction band of *** redox transitions of the cyclic voltammograms,in agreement with the XPS results,were found to be *** the supported materials presented bigger crystallite sizes than the unsupported ones,the total number of active sites of the former was also higher due to their better catalyst *** the outer and the total charges of the cyclic voltammograms in the range 0.1–1.4 V,stability and electrode potentials at given current densities,the preferred catalyst was Ir O2 supported on the *** electrode potentials corresponding to given current densities were between the smallest ones given in the literature despite the small oxide loading used in this work and its Nb doping,thus making the Nb-TNTs-supported IrO2 catalyst a promising candidate for the *** good dispersion of IrO2,high specific surface area of the Nb-doped supports,accessibility of the electroactive centers,increased stability due to Nb doping and electron donor properties of the Nb(IV)oxide species were considered the main reasons for its good performance.

关键词： Nb-doped TiO2 nanotubes IrO2 catalyst IrRuOx catalyst Oxygen evolution reaction PEMWE

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