ISSN:
1433-0768
Keywords:
Key words Heteropolyacids
;
CO electrochemical oxidation
;
Pd catalyst
;
Phosphotungstic acid
;
Gas-diffusion electrodes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Electro-oxidation of CO by Pd black in phosphotungstic acid (PWA) has been studied on porous gas-diffusion electrodes. Galvanostatic steady-state polarization data show that the reaction proceeds under strong activation control at low current densities. The current density at 0.5 VNHE is found to be three times higher than that in a H2SO4 reference electrolyte. X-ray photoelectron spectroscopic data on various electrochemically tested electrodes show lower oxidized Pd species in PWA than in H2SO4. It is conjectured that an increase in the electron density around Pd sites is ameliorated by PWA in relation to H2SO4, with a consequent promoting effect of the heteropolyacid towards CO electro-oxidation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100080050148
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