Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions
Само за регистроване кориснике
1999
Чланак у часопису (Објављена верзија)
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Приказ свих података о документуАпстракт
Electrocatalysis of CO oxidation and the interfacial structure of the CO adlayer (COad) on the Pt(111) surface in 0.5 M H2SO4 were examined by using the rotating disk electrode method in combination with in situ surface X-ray diffraction measurements. The results presented here elucidate the roles played by two different forms of COad: one which is oxidized at lower overpotentials, in the so-called preoxidation region, we characterize as a weakly adsorbed state (COad.w), and a strongly adsorbed state (COad,s) which is oxidized at higher overpotentials. The COad,w state forms at saturation coverage by adsorption at E lt 0.15 V and assumes a compressed p(2 x 2) structure containing 3 CO molecules in the unit cell (0.75 CO/Pt). We propose that oxidative removal of COad,w is accompanied by simultaneous relaxation of the CO adlayer, and that the remaining COad (approximate to 0.6 CO/Pt) assumes a new bonding state which we identify as COad,s. The COad,s state is present in a structure lac...king long-range order. Despite the reduced coverage by COad, H-2 electrooxidation is still completely poisoned at potentials below 0.6 V. The electrooxidation of CO in solution is proposed to occur via the COad,w state at 0.6-0.8 V, and via the COad,s at higher potentials.
Извор:
Journal of Physical Chemistry B, 1999, 103, 3, 487-495Издавач:
- Amer Chemical Soc, Washington
DOI: 10.1021/jp983177c
ISSN: 1089-5647
WoS: 000079043000014
Scopus: 2-s2.0-0002885507
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Marković, NM AU - Grgur, Branimir AU - Lucas, CA AU - Ross, PN PY - 1999 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/247 AB - Electrocatalysis of CO oxidation and the interfacial structure of the CO adlayer (COad) on the Pt(111) surface in 0.5 M H2SO4 were examined by using the rotating disk electrode method in combination with in situ surface X-ray diffraction measurements. The results presented here elucidate the roles played by two different forms of COad: one which is oxidized at lower overpotentials, in the so-called preoxidation region, we characterize as a weakly adsorbed state (COad.w), and a strongly adsorbed state (COad,s) which is oxidized at higher overpotentials. The COad,w state forms at saturation coverage by adsorption at E lt 0.15 V and assumes a compressed p(2 x 2) structure containing 3 CO molecules in the unit cell (0.75 CO/Pt). We propose that oxidative removal of COad,w is accompanied by simultaneous relaxation of the CO adlayer, and that the remaining COad (approximate to 0.6 CO/Pt) assumes a new bonding state which we identify as COad,s. The COad,s state is present in a structure lacking long-range order. Despite the reduced coverage by COad, H-2 electrooxidation is still completely poisoned at potentials below 0.6 V. The electrooxidation of CO in solution is proposed to occur via the COad,w state at 0.6-0.8 V, and via the COad,s at higher potentials. PB - Amer Chemical Soc, Washington T2 - Journal of Physical Chemistry B T1 - Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions EP - 495 IS - 3 SP - 487 VL - 103 DO - 10.1021/jp983177c ER -
@article{ author = "Marković, NM and Grgur, Branimir and Lucas, CA and Ross, PN", year = "1999", abstract = "Electrocatalysis of CO oxidation and the interfacial structure of the CO adlayer (COad) on the Pt(111) surface in 0.5 M H2SO4 were examined by using the rotating disk electrode method in combination with in situ surface X-ray diffraction measurements. The results presented here elucidate the roles played by two different forms of COad: one which is oxidized at lower overpotentials, in the so-called preoxidation region, we characterize as a weakly adsorbed state (COad.w), and a strongly adsorbed state (COad,s) which is oxidized at higher overpotentials. The COad,w state forms at saturation coverage by adsorption at E lt 0.15 V and assumes a compressed p(2 x 2) structure containing 3 CO molecules in the unit cell (0.75 CO/Pt). We propose that oxidative removal of COad,w is accompanied by simultaneous relaxation of the CO adlayer, and that the remaining COad (approximate to 0.6 CO/Pt) assumes a new bonding state which we identify as COad,s. The COad,s state is present in a structure lacking long-range order. Despite the reduced coverage by COad, H-2 electrooxidation is still completely poisoned at potentials below 0.6 V. The electrooxidation of CO in solution is proposed to occur via the COad,w state at 0.6-0.8 V, and via the COad,s at higher potentials.", publisher = "Amer Chemical Soc, Washington", journal = "Journal of Physical Chemistry B", title = "Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions", pages = "495-487", number = "3", volume = "103", doi = "10.1021/jp983177c" }
Marković, N., Grgur, B., Lucas, C.,& Ross, P.. (1999). Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions. in Journal of Physical Chemistry B Amer Chemical Soc, Washington., 103(3), 487-495. https://doi.org/10.1021/jp983177c
Marković N, Grgur B, Lucas C, Ross P. Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions. in Journal of Physical Chemistry B. 1999;103(3):487-495. doi:10.1021/jp983177c .
Marković, NM, Grgur, Branimir, Lucas, CA, Ross, PN, "Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions" in Journal of Physical Chemistry B, 103, no. 3 (1999):487-495, https://doi.org/10.1021/jp983177c . .