Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys
Само за регистроване кориснике
1998
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
We report new results for the electrooxidation of Hz, CO and H-2/CO mixtures on a Pt75Re25 bulk alloy using surface preparation in a UHV chamber and characterization by X-ray photoelectron spectroscopy (XPS). Sputter-cleaned but not-annealed surfaces having the bulk composition were used. This alloy surface has unique properties for CO electrooxidation: finite current densities below 0.2 V (rhe), a positive reaction order in CO partial pressure of +0.5, but an unusually high slope in the log i vs E curve, about 220;mV per decade. Anodic stripping of the irreversibly adsorbed CO on this surface also occurs at an unusually low potential, initiating at about 0.15 V, but only about 1/3 of the total amount of CO on the surface is oxidized at 0.15-0.4 V, the remainder being oxidized at 0.6-0.8 V. The polarization curves for the oxidation of H-2/CO mixtures containing 0.1-2% CO are, however, very Pt-like. It appears that the low-potential oxidation of both dissolved CO and adsorbed CO on this... surface occurs exclusively at Re sites, so that with the H-2/CO mixture the Pt sites remain fully covered (and thus deactivated) by COads.
Кључне речи:
electrocatalysis / CO-tolerant anodes / Pt-Re alloyИзвор:
Electrochimica Acta, 1998, 43, 24, 3631-3635Издавач:
- Pergamon-Elsevier Science Ltd, Oxford
DOI: 10.1016/S0013-4686(98)00120-0
ISSN: 0013-4686
WoS: 000075658900002
Scopus: 2-s2.0-0032310602
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Grgur, Branimir AU - Marković, NM AU - Ross, PN PY - 1998 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/218 AB - We report new results for the electrooxidation of Hz, CO and H-2/CO mixtures on a Pt75Re25 bulk alloy using surface preparation in a UHV chamber and characterization by X-ray photoelectron spectroscopy (XPS). Sputter-cleaned but not-annealed surfaces having the bulk composition were used. This alloy surface has unique properties for CO electrooxidation: finite current densities below 0.2 V (rhe), a positive reaction order in CO partial pressure of +0.5, but an unusually high slope in the log i vs E curve, about 220;mV per decade. Anodic stripping of the irreversibly adsorbed CO on this surface also occurs at an unusually low potential, initiating at about 0.15 V, but only about 1/3 of the total amount of CO on the surface is oxidized at 0.15-0.4 V, the remainder being oxidized at 0.6-0.8 V. The polarization curves for the oxidation of H-2/CO mixtures containing 0.1-2% CO are, however, very Pt-like. It appears that the low-potential oxidation of both dissolved CO and adsorbed CO on this surface occurs exclusively at Re sites, so that with the H-2/CO mixture the Pt sites remain fully covered (and thus deactivated) by COads. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Electrochimica Acta T1 - Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys EP - 3635 IS - 24 SP - 3631 VL - 43 DO - 10.1016/S0013-4686(98)00120-0 ER -
@article{ author = "Grgur, Branimir and Marković, NM and Ross, PN", year = "1998", abstract = "We report new results for the electrooxidation of Hz, CO and H-2/CO mixtures on a Pt75Re25 bulk alloy using surface preparation in a UHV chamber and characterization by X-ray photoelectron spectroscopy (XPS). Sputter-cleaned but not-annealed surfaces having the bulk composition were used. This alloy surface has unique properties for CO electrooxidation: finite current densities below 0.2 V (rhe), a positive reaction order in CO partial pressure of +0.5, but an unusually high slope in the log i vs E curve, about 220;mV per decade. Anodic stripping of the irreversibly adsorbed CO on this surface also occurs at an unusually low potential, initiating at about 0.15 V, but only about 1/3 of the total amount of CO on the surface is oxidized at 0.15-0.4 V, the remainder being oxidized at 0.6-0.8 V. The polarization curves for the oxidation of H-2/CO mixtures containing 0.1-2% CO are, however, very Pt-like. It appears that the low-potential oxidation of both dissolved CO and adsorbed CO on this surface occurs exclusively at Re sites, so that with the H-2/CO mixture the Pt sites remain fully covered (and thus deactivated) by COads.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Electrochimica Acta", title = "Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys", pages = "3635-3631", number = "24", volume = "43", doi = "10.1016/S0013-4686(98)00120-0" }
Grgur, B., Marković, N.,& Ross, P.. (1998). Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys. in Electrochimica Acta Pergamon-Elsevier Science Ltd, Oxford., 43(24), 3631-3635. https://doi.org/10.1016/S0013-4686(98)00120-0
Grgur B, Marković N, Ross P. Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys. in Electrochimica Acta. 1998;43(24):3631-3635. doi:10.1016/S0013-4686(98)00120-0 .
Grgur, Branimir, Marković, NM, Ross, PN, "Electrooxidation of H-2, CO and H-2/CO mixtures on a well-characterized Pt-Re bulk alloy electrode and comparison with other Pt binary alloys" in Electrochimica Acta, 43, no. 24 (1998):3631-3635, https://doi.org/10.1016/S0013-4686(98)00120-0 . .