|
|||||
|
|
Electro-oxidation of CO on Pd black in phosphotungstic acid |
|
| Authors: | Pier Luigi Antonucci Antonino S Aricò Esterina Modica Vincezo Antonucci |
| Institution: | (1) University of Reggio Calabria, Faculty of Engineering, Località Feo di Vito, I-89100 Reggio Calabria, Italy, IT;(2) Institute CNR-TAE, Salita S. Lucia sopra Contesse 5, I-98126 S. Lucia, Messina, Italy e-mail: antonucci@itae.me.cnr.it Tel.: +39-090-624234; Fax: +39-090-624247, IT |
| 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. Received: 29 July 1998 / Accepted: 15 September 1998 |
| Keywords: | Heteropolyacids CO electrochemical oxidation Pd catalyst Phosphotungstic acid Gas-diffusion electrodes |
| 本文献已被 SpringerLink 等数据库收录！ | |