The catalytic activity of Pt particles dispersed by mesoporous mixed Mo and V polyox- ometalates solid super-acid towards oxidation and reduction of Hydrogen and Oxygen has been explored. Polyoxometalates are attractive due to their properties for several appli- cations, as preparation facility, nanometers size particles1, high protonic conductivities in solid state2, thermal stability and acidity3. Normal and Pt(IV) impregnated CSx H(3 + n)- x PMo 12 − nVn O40 was prepared by titration of an aqueous solution of phosphovanado- molibdic acid and a known quantity of hexachloroplatinic acid (only for the impregnated salts), with a solution of cesium carbonate. Different amount of Cesium was used to under- stand which one provide the better performance combined with good durability. Structural, morphological and chemical characterization (SEM-EDX, TEM, XRD, Uv-VIS, IR) was performed, followed by rotating ring-disk electrode (RRDE) studies (Fig. 1) and Fuel Cell polarization curve.

Electrochemical and Physical characterization of Keggin type polyoxometalates composite catalysts for PEM Fuel Cells

RENZI, MARCO;NOBILI, Francesco
2014-01-01

Abstract

The catalytic activity of Pt particles dispersed by mesoporous mixed Mo and V polyox- ometalates solid super-acid towards oxidation and reduction of Hydrogen and Oxygen has been explored. Polyoxometalates are attractive due to their properties for several appli- cations, as preparation facility, nanometers size particles1, high protonic conductivities in solid state2, thermal stability and acidity3. Normal and Pt(IV) impregnated CSx H(3 + n)- x PMo 12 − nVn O40 was prepared by titration of an aqueous solution of phosphovanado- molibdic acid and a known quantity of hexachloroplatinic acid (only for the impregnated salts), with a solution of cesium carbonate. Different amount of Cesium was used to under- stand which one provide the better performance combined with good durability. Structural, morphological and chemical characterization (SEM-EDX, TEM, XRD, Uv-VIS, IR) was performed, followed by rotating ring-disk electrode (RRDE) studies (Fig. 1) and Fuel Cell polarization curve.
2014
9788867680221
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/365392
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