In this study, Pt/SnO2 catalysts with different metal content: 4.1, 8.2 and 16.4% of Pt were obtained by one-pot sol–gel method. Tin (IV) acetate as a gel precursor of tin (IV) oxide and aqueous solution of H2PtCl6 as a precursor of the metallic phase were applied. An aqueous solution of hexachloroplatinic acid added to isopropyl alcohol solution of tin (IV) acetate causes rapid cross-linking of colloidal SnO2. Pt/SnO2 sol–gel system have found various applications in catalysis, gas sensors and electrochemistry [11]-[15]. The sol–gel technique allows to obtain mesoporous oxide as a result of medium temperature treatment (473–573 K) of the systems and consequently may positively affect the stabilisation of small particles of metallic phase [16].
Platinum crystallite size plays a key role in catalysis and electrochemistry [17]. It is equally important to ensure their stability and maintain their size during the whole operating time of the catalyst. In our method, uniform dispersion of the metal phase precursor in the bulk of the gel occurs during its synthesis, resulting in further metal stabilisation during thermal treatment.
The aim of the study was to determine the effect of the Pt concentration in the media and the effect of the thermal treatment in the temperature range of 293 K to 773 K on the metal crystallite size on the surface of catalyst. The resulting systems were characterized by XRD studies and transmission electron microscopy. The drying and thermal treatment of the Pt/SnO2 gels were characterized by ATR/FT-IR spectroscopy and thermal gravimetric analysis. Finally, the electrochemical activity of Pt/SnO2 systems was studied by cyclic voltammetry.
In this study, Pt/SnO2 catalysts with different metal content: 4.1, 8.2 and 16.4% of Pt were obtained by one-pot sol–gel method. Tin (IV) acetate as a gel precursor of tin (IV) oxide and aqueous solution of H2PtCl6 as a precursor of the metallic phase were applied. An aqueous solution of hexachloroplatinic acid added to isopropyl alcohol solution of tin (IV) acetate causes rapid cross-linking of colloidal SnO2. Pt/SnO2 sol–gel system have found various applications in catalysis, gas sensors and electrochemistry [11]-[15]. The sol–gel technique allows to obtain mesoporous oxide as a result of medium temperature treatment (473–573 K) of the systems and consequently may positively affect the stabilisation of small particles of metallic phase [16].
Platinum crystallite size plays a key role in catalysis and electrochemistry [17]. It is equally important to ensure their stability and maintain their size during the whole operating time of the catalyst. In our method, uniform dispersion of the metal phase precursor in the bulk of the gel occurs during its synthesis, resulting in further metal stabilisation during thermal treatment.
The aim of the study was to determine the effect of the Pt concentration in the media and the effect of the thermal treatment in the temperature range of 293 K to 773 K on the metal crystallite size on the surface of catalyst. The resulting systems were characterized by XRD studies and transmission electron microscopy. The drying and thermal treatment of the Pt/SnO2 gels were characterized by ATR/FT-IR spectroscopy and thermal gravimetric analysis. Finally, the electrochemical activity of Pt/SnO2 systems was studied by cyclic voltammetry.
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