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Morphological and Electrochemical Characterization of Ti/MxTiySnzO2 (M = Ir or Ru) Electrodes Prepared by the polymeric precursor method

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Advances in Chemical Engineering and Science 2016年第4期6卷 364-378页

作者： Jussara F. Carneiro Jéssica R. Silva Robson S. Rocha Josimar Ribeiro Marcos R. V. Lanza Instituto de Química de Sao Carlos USP-Universidade de Sao Paulo Sao Carlos SP Brazil Departamento de Química UFES-Universidade Federal do Espírito Santo Vitória ES Brazil Escola de Engenharia de Sao Carlos USP-Universidade de Sao Paulo Sao Carlos SP Brazil

This paper describes the effect of the composition of the oxide films on the properties of electrodes Ti/MxTiySnzO2 (M = Ir or Ru) prepared by the polymeric precursor method. XRD studies showed that the anodes are formed by solid solutions. The electrodes containing IrO2 exhibit lower activity for the oxygen evolution reaction. The doping of the electrode surface with SnO2 improves the catalytic properties of the anodes. However, it should be held in appropriate compositions, because the change in the atomic ratio of this element shows a marked effect on the stability of the oxides. Electrode Ti/Ir0.2Ti0.3Sn0.5O2 has lower lifetime, i.e. 6 hours. The 20% decrease in the stoichiometric amount of SnO2 increases the time to a value above 70 hours, as observed for Ti/Ir0.3Ti0.4Sn0.3O2. Electrode Ti/Ru0.3Ti0.4Sn0.3O2 shows lifetime of 11 hours;therefore IrO2 is more stable than RuO2 under the conditions investigated. These results suggest that electrode Ti/Ir0.3Ti0.4Sn0.3O2 is promising for different applications, such as water electrolysis, capacitors and organic electrosynthesis.

关键词： Dimensionally Stable Anodes (DSA) Oxide Films Electrochemical Properties polymeric precursor method

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Use of Perovskite-Type Lanthanum Nickelate Synthesized by the polymeric precursor method in the Steam Reforming Reaction of Methane

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Materials Sciences and Applications 2012年第6期3卷 363-368页

作者： Daniele M.H.Martinelli Dulce M.A.Melo Anne M.Garrido Pedrosa Antonio E.Martinelli Marcus A.de F.Melo Mary K.S.Batista Roberto C.Bitencourt Department of Chemistry Federal University of Rio Grande do NorteCCETNatalBrazil Department of Chemistry Federal University of SergipeCCETSao CristóvaoBrazil Research Center Petrobras—Cenpes Rio de JaneiroBrazil

In the current work, LaNiO3 perovskite was synthesized using the polymeric precursor method. The materials were thermally treated at 300°C for 2 hours, subsequently supported on alumina or zirconia and finally calcined at 800°C for 4 hours. The resulting samples were characterized by X-ray diffraction, thermogravimetry, BET surface area and thermo-programmed reduction. Steam reforming reactions were carried out at 750°C and 6 bar during 4 hours using a pilot reactor under a H2O:CH4 ratio of 2.5. The mass of catalysts was about 5.7 g. X-ray diffraction patterns confirmed the formation of the perovskite structure in all samples prepared. The results also showed that lanthanum nickelate was more efficient when supported on alumina than zirconia. Finally, it was observed that the methane conversion was approximately 94% and the selectivity to hydrogen was about 70%. In all cases low selectivity to CO and CO2 was verified.

关键词： Lanthanum Nickelate Perovskite polymeric precursor method Steam Reforming Reaction

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