Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate
Apstrakt
The oxygen reduction reaction (ORR) has been studied on CO-covered Pt(111), Pt(110), Pt-poly, Pt-Ru, Pt3Sn(111), and Pt3Sn( 110) electrodes in 0.5 M H2SO4 solution at temperatures varying between 298 and 333 K using the rotating ring-disk electrode (RRDE) method. The RRDE measurements showed that even during O-2 reduction a substantial amount (approximate to40% of saturation) of CO still remains on all surfaces. Only a very small fraction of consumed 02 is used for CO oxidation, while the major fraction reacts via the competing ORR, producing H2O2. The H2O2 yield is strongly dependent on the fractional coverage by adsorbed CO, the surface structure, and the composition of the electrode. While at Theta(CO) gt 0.5 monolayer (ML) the H2O2 yield is very high (depending on the structure/nature of the electrode ca. 60-100%), when Theta(CO) falls to its steady-state value of approximate to0.4 ML, the H2O2 yield is almost the same as on the respective CO-free surfaces. Although the productio...n of peroxide on some electrodes is rather low at 333 K (e.g., 5% on PtRu and 10% on Pt-poly), the practical consequences of the H2O2 production can be significant; e.g., H2O2 may cause an enhanced long-term degradation of the membrane.
Izvor:
Journal of the Electrochemical Society, 2005, 152, 2, A277-A282Izdavač:
- Electrochemical Soc Inc, Pennington
DOI: 10.1149/1.1845321
ISSN: 0013-4651
WoS: 000227142400003
Scopus: 2-s2.0-14744282088
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Stamenković, V AU - Grgur, Branimir AU - Ross, PN AU - Marković, NM PY - 2005 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/827 AB - The oxygen reduction reaction (ORR) has been studied on CO-covered Pt(111), Pt(110), Pt-poly, Pt-Ru, Pt3Sn(111), and Pt3Sn( 110) electrodes in 0.5 M H2SO4 solution at temperatures varying between 298 and 333 K using the rotating ring-disk electrode (RRDE) method. The RRDE measurements showed that even during O-2 reduction a substantial amount (approximate to40% of saturation) of CO still remains on all surfaces. Only a very small fraction of consumed 02 is used for CO oxidation, while the major fraction reacts via the competing ORR, producing H2O2. The H2O2 yield is strongly dependent on the fractional coverage by adsorbed CO, the surface structure, and the composition of the electrode. While at Theta(CO) gt 0.5 monolayer (ML) the H2O2 yield is very high (depending on the structure/nature of the electrode ca. 60-100%), when Theta(CO) falls to its steady-state value of approximate to0.4 ML, the H2O2 yield is almost the same as on the respective CO-free surfaces. Although the production of peroxide on some electrodes is rather low at 333 K (e.g., 5% on PtRu and 10% on Pt-poly), the practical consequences of the H2O2 production can be significant; e.g., H2O2 may cause an enhanced long-term degradation of the membrane. PB - Electrochemical Soc Inc, Pennington T2 - Journal of the Electrochemical Society T1 - Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate EP - A282 IS - 2 SP - A277 VL - 152 DO - 10.1149/1.1845321 ER -
@article{ author = "Stamenković, V and Grgur, Branimir and Ross, PN and Marković, NM", year = "2005", abstract = "The oxygen reduction reaction (ORR) has been studied on CO-covered Pt(111), Pt(110), Pt-poly, Pt-Ru, Pt3Sn(111), and Pt3Sn( 110) electrodes in 0.5 M H2SO4 solution at temperatures varying between 298 and 333 K using the rotating ring-disk electrode (RRDE) method. The RRDE measurements showed that even during O-2 reduction a substantial amount (approximate to40% of saturation) of CO still remains on all surfaces. Only a very small fraction of consumed 02 is used for CO oxidation, while the major fraction reacts via the competing ORR, producing H2O2. The H2O2 yield is strongly dependent on the fractional coverage by adsorbed CO, the surface structure, and the composition of the electrode. While at Theta(CO) gt 0.5 monolayer (ML) the H2O2 yield is very high (depending on the structure/nature of the electrode ca. 60-100%), when Theta(CO) falls to its steady-state value of approximate to0.4 ML, the H2O2 yield is almost the same as on the respective CO-free surfaces. Although the production of peroxide on some electrodes is rather low at 333 K (e.g., 5% on PtRu and 10% on Pt-poly), the practical consequences of the H2O2 production can be significant; e.g., H2O2 may cause an enhanced long-term degradation of the membrane.", publisher = "Electrochemical Soc Inc, Pennington", journal = "Journal of the Electrochemical Society", title = "Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate", pages = "A282-A277", number = "2", volume = "152", doi = "10.1149/1.1845321" }
Stamenković, V., Grgur, B., Ross, P.,& Marković, N.. (2005). Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate. in Journal of the Electrochemical Society Electrochemical Soc Inc, Pennington., 152(2), A277-A282. https://doi.org/10.1149/1.1845321
Stamenković V, Grgur B, Ross P, Marković N. Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate. in Journal of the Electrochemical Society. 2005;152(2):A277-A282. doi:10.1149/1.1845321 .
Stamenković, V, Grgur, Branimir, Ross, PN, Marković, NM, "Oxygen reduction reaction on Pt and Pt-bimetallic electrodes covered by CO - Mechanism of the air bleed effect with reformate" in Journal of the Electrochemical Society, 152, no. 2 (2005):A277-A282, https://doi.org/10.1149/1.1845321 . .