Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study
Abstract
The kinetics of oxygen reduction on the Au(111) surface in acidic solution has been re-examined by means of a rotating disc electrode technique. Its vicinal Au(332) = Au[6(111) × (111)] surface has been chosen to examine the role of a small density of steps as active sites. The increase of the average surface energy, caused by the presence of steps on the Au(332) face, causes a slight shift of the half-wave potential to a more positive value, compared to the Au(111). The reaction on Au(111) is kinetically hindered in the whole potential region up to hydrogen evolution. The presence of steps on the Au(332) face apparently causes the kinetic limitations to be lifted. The kinetics of oxygen reduction on the Au(332) face in alkaline solution has been studied by means of a rotating disc-ring method. The mechanism of the reaction has been found the simplest among all the faces of Au investigated so far. In the kinetic and mixed control regions the reduction proceeds through the simplest 2e-s...eries pathway. At large overpotentials, a 4e-reduction occurs, whose extent depends on the potential, with a surface diffusion of HO-2a as a rate determining step. No splitting of the OO bond has been found. A map of the reaction pathways for the whole potential range of oxygen reduction has been constructed.
Keywords:
gold / oxygen reduction / reaction pathways / rotating disc-ringSource:
Electrochimica Acta, 1994, 39, 7, 983-990Publisher:
- Elsevier
Funding / projects:
- The Yugoslav-Amencan Fund (Contract DOE -966)
Collections
Institution/Community
IHTMTY - JOUR AU - Štrbac, Svetlana AU - Anastasijević, Nikola A. AU - Adžić, Radoslav R. PY - 1994 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4354 AB - The kinetics of oxygen reduction on the Au(111) surface in acidic solution has been re-examined by means of a rotating disc electrode technique. Its vicinal Au(332) = Au[6(111) × (111)] surface has been chosen to examine the role of a small density of steps as active sites. The increase of the average surface energy, caused by the presence of steps on the Au(332) face, causes a slight shift of the half-wave potential to a more positive value, compared to the Au(111). The reaction on Au(111) is kinetically hindered in the whole potential region up to hydrogen evolution. The presence of steps on the Au(332) face apparently causes the kinetic limitations to be lifted. The kinetics of oxygen reduction on the Au(332) face in alkaline solution has been studied by means of a rotating disc-ring method. The mechanism of the reaction has been found the simplest among all the faces of Au investigated so far. In the kinetic and mixed control regions the reduction proceeds through the simplest 2e-series pathway. At large overpotentials, a 4e-reduction occurs, whose extent depends on the potential, with a surface diffusion of HO-2a as a rate determining step. No splitting of the OO bond has been found. A map of the reaction pathways for the whole potential range of oxygen reduction has been constructed. PB - Elsevier T2 - Electrochimica Acta T1 - Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study VL - 39 IS - 7 SP - 983 EP - 990 DO - 10.1016/0013-4686(94)85116-6 ER -
@article{ author = "Štrbac, Svetlana and Anastasijević, Nikola A. and Adžić, Radoslav R.", year = "1994", abstract = "The kinetics of oxygen reduction on the Au(111) surface in acidic solution has been re-examined by means of a rotating disc electrode technique. Its vicinal Au(332) = Au[6(111) × (111)] surface has been chosen to examine the role of a small density of steps as active sites. The increase of the average surface energy, caused by the presence of steps on the Au(332) face, causes a slight shift of the half-wave potential to a more positive value, compared to the Au(111). The reaction on Au(111) is kinetically hindered in the whole potential region up to hydrogen evolution. The presence of steps on the Au(332) face apparently causes the kinetic limitations to be lifted. The kinetics of oxygen reduction on the Au(332) face in alkaline solution has been studied by means of a rotating disc-ring method. The mechanism of the reaction has been found the simplest among all the faces of Au investigated so far. In the kinetic and mixed control regions the reduction proceeds through the simplest 2e-series pathway. At large overpotentials, a 4e-reduction occurs, whose extent depends on the potential, with a surface diffusion of HO-2a as a rate determining step. No splitting of the OO bond has been found. A map of the reaction pathways for the whole potential range of oxygen reduction has been constructed.", publisher = "Elsevier", journal = "Electrochimica Acta", title = "Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study", volume = "39", number = "7", pages = "983-990", doi = "10.1016/0013-4686(94)85116-6" }
Štrbac, S., Anastasijević, N. A.,& Adžić, R. R.. (1994). Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study. in Electrochimica Acta Elsevier., 39(7), 983-990. https://doi.org/10.1016/0013-4686(94)85116-6
Štrbac S, Anastasijević NA, Adžić RR. Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study. in Electrochimica Acta. 1994;39(7):983-990. doi:10.1016/0013-4686(94)85116-6 .
Štrbac, Svetlana, Anastasijević, Nikola A., Adžić, Radoslav R., "Oxygen reduction on Au(111) and vicinal Au(332) faces: A rotating disc and disc-ring study" in Electrochimica Acta, 39, no. 7 (1994):983-990, https://doi.org/10.1016/0013-4686(94)85116-6 . .