Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces
Оксидација CO на биметалним Ru/Au(111) површинама
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The electrochemical deposition of Ru on Au(111) was performed in 0.5 M H2SO4 + 10-4 M RuCl3. The obtained bimetallic Ru/Au(111) surfaces were characterised by cyclic voltammetry and in situ STM in 0.5 M H2SO4. The Ru deposit consists of nanoscale islands, which merge with increasing coverage. Two different types of bimetallic Ru/Au(111) surfaces with respect to the distribution of Ru islands over the Au(111) substrate surface were obtained. When the deposition was performed at potentials more positive than the range of Au(111) reconstruction, homogeneous nucleation occured resulting in a random distribution of Ru islands. When the deposition was performed on reconstructed Au(111) at low overpotentials, selective nucleation occured resulting in the replication of the Au(111) reconstruction. Only at higher deposition overpotentials, can multilayer deposits be formed, which exhibit a very rough surface morphology. The electrocatalytic activity of such structurally well defined Ru/Au(111) ...bimetallic surfaces was studied towards CO oxidation with the Ru coverage ranging from submonolayer to several monolayer. CO stripping commences at about 0.2 V and occurs over a broad potential range. The observed influence of the Ru structure on the CO stripping voltammetry is explained by local variations in the CO adsorption energy, caused by differences in the local Ru structure and by effects induced by the Au(111) substrate.
Ru je deponovan elektrohemijski na monokristalu Au(111) iz rastvora 0,5 M
H2SO4+10-4 M RuCl3. Karakterizacija dobijenih bimetalnih Ru/Au(111) površina je
izvedena cikličnom voltametrijom i in situ STM-om u 0,5MH2SO4 rastvoru. Depozit Ru
se sastoji od nanometarskih ostrva, koja se stapaju sa povećanjem pokrivenosti. U
odnosu na raspodelu ostrva Ru po površini Au(111) substrata, dobijena su dva razli-
čita tipa bimetalnih površina. Ako je depozicija izvedena na potencijalima pozitivnijim
od oblasti rekonstrukcije, tj. na nerekonstruisanoj Au(111) površini, dobija
se neuređena raspodela ostrva Ru. Ako je depozicija izvedena na rekonstruisanoj
Au(111) površini na maloj prenapetosti, dobija se selektivni rast ostrva Ru, što
rezultuje u replici rekonstrukcije. Samo na većim prenapetostima, formira se
višeslojni depozit, sa veoma grubom površinskom morfologijom. Ispitivana je
elektrokatalitička aktivnost za oksidaciju CO ovakvih strukturno definisanih
bimetalnih Ru/Au(111) površin...a, sa pokrivenošću Ru manjom od monosloja do nekoliko
monoslojeva. Oksidacija CO počinje na oko 0,2 V i odigrava se u širokoj oblasti
potencijala. Uticaj strukture depozita Ru na oksidaciju CO se objašnjava varijacijama
u energiji adsorpcijeCOzbog različite lokalne strukture deponovanih ostrva Ru.
Кључне речи:
Au(111) / Bimetallic surfaces / Co-oxidation / Ru deposition / STMИзвор:
Journal of the Serbian Chemical Society, 2001, 66, 2, 119-129Издавач:
- Belgrade : Serbian Chemical Society
Институција/група
IHTMTY - JOUR AU - Štrbac, Svetlana AU - Magnussen, Olaf Magnus AU - Behm, Rolf Jürgen PY - 2001 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4343 AB - The electrochemical deposition of Ru on Au(111) was performed in 0.5 M H2SO4 + 10-4 M RuCl3. The obtained bimetallic Ru/Au(111) surfaces were characterised by cyclic voltammetry and in situ STM in 0.5 M H2SO4. The Ru deposit consists of nanoscale islands, which merge with increasing coverage. Two different types of bimetallic Ru/Au(111) surfaces with respect to the distribution of Ru islands over the Au(111) substrate surface were obtained. When the deposition was performed at potentials more positive than the range of Au(111) reconstruction, homogeneous nucleation occured resulting in a random distribution of Ru islands. When the deposition was performed on reconstructed Au(111) at low overpotentials, selective nucleation occured resulting in the replication of the Au(111) reconstruction. Only at higher deposition overpotentials, can multilayer deposits be formed, which exhibit a very rough surface morphology. The electrocatalytic activity of such structurally well defined Ru/Au(111) bimetallic surfaces was studied towards CO oxidation with the Ru coverage ranging from submonolayer to several monolayer. CO stripping commences at about 0.2 V and occurs over a broad potential range. The observed influence of the Ru structure on the CO stripping voltammetry is explained by local variations in the CO adsorption energy, caused by differences in the local Ru structure and by effects induced by the Au(111) substrate. AB - Ru je deponovan elektrohemijski na monokristalu Au(111) iz rastvora 0,5 M H2SO4+10-4 M RuCl3. Karakterizacija dobijenih bimetalnih Ru/Au(111) površina je izvedena cikličnom voltametrijom i in situ STM-om u 0,5MH2SO4 rastvoru. Depozit Ru se sastoji od nanometarskih ostrva, koja se stapaju sa povećanjem pokrivenosti. U odnosu na raspodelu ostrva Ru po površini Au(111) substrata, dobijena su dva razli- čita tipa bimetalnih površina. Ako je depozicija izvedena na potencijalima pozitivnijim od oblasti rekonstrukcije, tj. na nerekonstruisanoj Au(111) površini, dobija se neuređena raspodela ostrva Ru. Ako je depozicija izvedena na rekonstruisanoj Au(111) površini na maloj prenapetosti, dobija se selektivni rast ostrva Ru, što rezultuje u replici rekonstrukcije. Samo na većim prenapetostima, formira se višeslojni depozit, sa veoma grubom površinskom morfologijom. Ispitivana je elektrokatalitička aktivnost za oksidaciju CO ovakvih strukturno definisanih bimetalnih Ru/Au(111) površina, sa pokrivenošću Ru manjom od monosloja do nekoliko monoslojeva. Oksidacija CO počinje na oko 0,2 V i odigrava se u širokoj oblasti potencijala. Uticaj strukture depozita Ru na oksidaciju CO se objašnjava varijacijama u energiji adsorpcijeCOzbog različite lokalne strukture deponovanih ostrva Ru. PB - Belgrade : Serbian Chemical Society T2 - Journal of the Serbian Chemical Society T1 - Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces T1 - Оксидација CO на биметалним Ru/Au(111) површинама VL - 66 IS - 2 SP - 119 EP - 129 DO - 10.2298/jsc0102119s ER -
@article{ author = "Štrbac, Svetlana and Magnussen, Olaf Magnus and Behm, Rolf Jürgen", year = "2001", abstract = "The electrochemical deposition of Ru on Au(111) was performed in 0.5 M H2SO4 + 10-4 M RuCl3. The obtained bimetallic Ru/Au(111) surfaces were characterised by cyclic voltammetry and in situ STM in 0.5 M H2SO4. The Ru deposit consists of nanoscale islands, which merge with increasing coverage. Two different types of bimetallic Ru/Au(111) surfaces with respect to the distribution of Ru islands over the Au(111) substrate surface were obtained. When the deposition was performed at potentials more positive than the range of Au(111) reconstruction, homogeneous nucleation occured resulting in a random distribution of Ru islands. When the deposition was performed on reconstructed Au(111) at low overpotentials, selective nucleation occured resulting in the replication of the Au(111) reconstruction. Only at higher deposition overpotentials, can multilayer deposits be formed, which exhibit a very rough surface morphology. The electrocatalytic activity of such structurally well defined Ru/Au(111) bimetallic surfaces was studied towards CO oxidation with the Ru coverage ranging from submonolayer to several monolayer. CO stripping commences at about 0.2 V and occurs over a broad potential range. The observed influence of the Ru structure on the CO stripping voltammetry is explained by local variations in the CO adsorption energy, caused by differences in the local Ru structure and by effects induced by the Au(111) substrate., Ru je deponovan elektrohemijski na monokristalu Au(111) iz rastvora 0,5 M H2SO4+10-4 M RuCl3. Karakterizacija dobijenih bimetalnih Ru/Au(111) površina je izvedena cikličnom voltametrijom i in situ STM-om u 0,5MH2SO4 rastvoru. Depozit Ru se sastoji od nanometarskih ostrva, koja se stapaju sa povećanjem pokrivenosti. U odnosu na raspodelu ostrva Ru po površini Au(111) substrata, dobijena su dva razli- čita tipa bimetalnih površina. Ako je depozicija izvedena na potencijalima pozitivnijim od oblasti rekonstrukcije, tj. na nerekonstruisanoj Au(111) površini, dobija se neuređena raspodela ostrva Ru. Ako je depozicija izvedena na rekonstruisanoj Au(111) površini na maloj prenapetosti, dobija se selektivni rast ostrva Ru, što rezultuje u replici rekonstrukcije. Samo na većim prenapetostima, formira se višeslojni depozit, sa veoma grubom površinskom morfologijom. Ispitivana je elektrokatalitička aktivnost za oksidaciju CO ovakvih strukturno definisanih bimetalnih Ru/Au(111) površina, sa pokrivenošću Ru manjom od monosloja do nekoliko monoslojeva. Oksidacija CO počinje na oko 0,2 V i odigrava se u širokoj oblasti potencijala. Uticaj strukture depozita Ru na oksidaciju CO se objašnjava varijacijama u energiji adsorpcijeCOzbog različite lokalne strukture deponovanih ostrva Ru.", publisher = "Belgrade : Serbian Chemical Society", journal = "Journal of the Serbian Chemical Society", title = "Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces, Оксидација CO на биметалним Ru/Au(111) површинама", volume = "66", number = "2", pages = "119-129", doi = "10.2298/jsc0102119s" }
Štrbac, S., Magnussen, O. M.,& Behm, R. J.. (2001). Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces. in Journal of the Serbian Chemical Society Belgrade : Serbian Chemical Society., 66(2), 119-129. https://doi.org/10.2298/jsc0102119s
Štrbac S, Magnussen OM, Behm RJ. Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces. in Journal of the Serbian Chemical Society. 2001;66(2):119-129. doi:10.2298/jsc0102119s .
Štrbac, Svetlana, Magnussen, Olaf Magnus, Behm, Rolf Jürgen, "Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces" in Journal of the Serbian Chemical Society, 66, no. 2 (2001):119-129, https://doi.org/10.2298/jsc0102119s . .