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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
