In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes
Само за регистроване кориснике
2004
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
We provide an overview of structure and reactivity of selected bimetallic single crystal electrodes obtained by the method of spontaneous deposition. The surfaces that are described and compared are the following: Au(111)/Ru, Pt(111)/Ru and Pt(111)/Os. Detailed morphological information is presented and the significance of this work in current and further study of nanoisland covered surfaces in the catalytic and spectroscopic perspective is highlighted. All surfaces were investigated by in situ STM and by electroanalytical techniques. The results confirm our previous data that nanosized Ru islands are formed with specific and distinctive structural features, and that the Ru growth pattern is different for Au(111) and Pt(111). For Au(111), Ru is preferentially deposited on steps, while a random and relatively sparse distribution of Ru islands is observed on terraces. In contrast, for Ru deposited on Pt(111), a homogeneous deposition over all the Pt(111) surface was,found. Os is also dep...osited homogeneously, and at a much higher rate than Ru, and even within a single deposition it forms a large proportion of multilayer islands. On Au(111), the Ru islands on both steps and terraces reach the saturation coverage within a short deposition time, and the Ru islands grow to multilayer heights and assume hexagonal shapes. On Pt(111), the Ru saturation coverage is reached relatively fast, but when a single deposition is applied, Ru nanoislands of mainly monoatomic height are formed, with the Ru coverage not exceeding 0.2 ML. For Ru deposits on Pt(111), we demonstrate that larger and multilayer islands obtained in two consecutive depositions can be reduced in size-both in height and width-by oxidizing the Ru islands and then by reducing them back to a metallic state. A clear increase in the Ru island dispersion is then obtained. However, methanol oxidation chronoamperometry shows that the surface with such a higher dispersion is less active to methanol oxidation than the initial surface. A preliminary interpretation of this effect is provided. Finally, we studied CO stripping reaction on Pt(111)/Ru, Au(111)/Ru and on Pt(111)/Os. We relate CO oxidation differences observed between Pt(111)/Ru and Pt(111)/Os to the difference in the oxophilicity of the two admetals. In turn, the difference in the CO stripping reaction on Pt(111)/Ru and Au(111)/Ru with respect to the Ru islands is linked to the effect of the substrate on the bond strength and/or adlayer structure of CO and OHads species.
Кључне речи:
Catalysis / Electrochemical methods / Gold / Low index single crystal surfaces / Osmium / Platinum / Ruthenium / Scanning tunneling microscopyИзвор:
Surface Science, 2004, 573, 1, 80-Издавач:
- Elsevier
Финансирање / пројекти:
- The US Department of Energy, Division of Materials Sciences under Award No. DEFG02-91ER45439
- The National Science Foundation grant number Grant CHE 03-4999
- The MSEP of Republic of Serbia (project H-1796).
DOI: 10.1016/j.susc.2004.04.060
ISSN: 0039-6028; 1879-2758
WoS: 000225660000011
Scopus: 2-s2.0-9944236739
Институција/група
IHTMTY - JOUR AU - Štrbac, Svetlana AU - Johnston, Christina Marie AU - Lu, Guoqiang AU - Crown, Alechia AU - Wiȩckowski, Andrzej PY - 2004 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4342 AB - We provide an overview of structure and reactivity of selected bimetallic single crystal electrodes obtained by the method of spontaneous deposition. The surfaces that are described and compared are the following: Au(111)/Ru, Pt(111)/Ru and Pt(111)/Os. Detailed morphological information is presented and the significance of this work in current and further study of nanoisland covered surfaces in the catalytic and spectroscopic perspective is highlighted. All surfaces were investigated by in situ STM and by electroanalytical techniques. The results confirm our previous data that nanosized Ru islands are formed with specific and distinctive structural features, and that the Ru growth pattern is different for Au(111) and Pt(111). For Au(111), Ru is preferentially deposited on steps, while a random and relatively sparse distribution of Ru islands is observed on terraces. In contrast, for Ru deposited on Pt(111), a homogeneous deposition over all the Pt(111) surface was,found. Os is also deposited homogeneously, and at a much higher rate than Ru, and even within a single deposition it forms a large proportion of multilayer islands. On Au(111), the Ru islands on both steps and terraces reach the saturation coverage within a short deposition time, and the Ru islands grow to multilayer heights and assume hexagonal shapes. On Pt(111), the Ru saturation coverage is reached relatively fast, but when a single deposition is applied, Ru nanoislands of mainly monoatomic height are formed, with the Ru coverage not exceeding 0.2 ML. For Ru deposits on Pt(111), we demonstrate that larger and multilayer islands obtained in two consecutive depositions can be reduced in size-both in height and width-by oxidizing the Ru islands and then by reducing them back to a metallic state. A clear increase in the Ru island dispersion is then obtained. However, methanol oxidation chronoamperometry shows that the surface with such a higher dispersion is less active to methanol oxidation than the initial surface. A preliminary interpretation of this effect is provided. Finally, we studied CO stripping reaction on Pt(111)/Ru, Au(111)/Ru and on Pt(111)/Os. We relate CO oxidation differences observed between Pt(111)/Ru and Pt(111)/Os to the difference in the oxophilicity of the two admetals. In turn, the difference in the CO stripping reaction on Pt(111)/Ru and Au(111)/Ru with respect to the Ru islands is linked to the effect of the substrate on the bond strength and/or adlayer structure of CO and OHads species. PB - Elsevier T2 - Surface Science T1 - In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes VL - 573 VL - 99 IS - 1 SP - 80 DO - 10.1016/j.susc.2004.04.060 ER -
@article{ author = "Štrbac, Svetlana and Johnston, Christina Marie and Lu, Guoqiang and Crown, Alechia and Wiȩckowski, Andrzej", year = "2004", abstract = "We provide an overview of structure and reactivity of selected bimetallic single crystal electrodes obtained by the method of spontaneous deposition. The surfaces that are described and compared are the following: Au(111)/Ru, Pt(111)/Ru and Pt(111)/Os. Detailed morphological information is presented and the significance of this work in current and further study of nanoisland covered surfaces in the catalytic and spectroscopic perspective is highlighted. All surfaces were investigated by in situ STM and by electroanalytical techniques. The results confirm our previous data that nanosized Ru islands are formed with specific and distinctive structural features, and that the Ru growth pattern is different for Au(111) and Pt(111). For Au(111), Ru is preferentially deposited on steps, while a random and relatively sparse distribution of Ru islands is observed on terraces. In contrast, for Ru deposited on Pt(111), a homogeneous deposition over all the Pt(111) surface was,found. Os is also deposited homogeneously, and at a much higher rate than Ru, and even within a single deposition it forms a large proportion of multilayer islands. On Au(111), the Ru islands on both steps and terraces reach the saturation coverage within a short deposition time, and the Ru islands grow to multilayer heights and assume hexagonal shapes. On Pt(111), the Ru saturation coverage is reached relatively fast, but when a single deposition is applied, Ru nanoislands of mainly monoatomic height are formed, with the Ru coverage not exceeding 0.2 ML. For Ru deposits on Pt(111), we demonstrate that larger and multilayer islands obtained in two consecutive depositions can be reduced in size-both in height and width-by oxidizing the Ru islands and then by reducing them back to a metallic state. A clear increase in the Ru island dispersion is then obtained. However, methanol oxidation chronoamperometry shows that the surface with such a higher dispersion is less active to methanol oxidation than the initial surface. A preliminary interpretation of this effect is provided. Finally, we studied CO stripping reaction on Pt(111)/Ru, Au(111)/Ru and on Pt(111)/Os. We relate CO oxidation differences observed between Pt(111)/Ru and Pt(111)/Os to the difference in the oxophilicity of the two admetals. In turn, the difference in the CO stripping reaction on Pt(111)/Ru and Au(111)/Ru with respect to the Ru islands is linked to the effect of the substrate on the bond strength and/or adlayer structure of CO and OHads species.", publisher = "Elsevier", journal = "Surface Science", title = "In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes", volume = "573, 99", number = "1", pages = "80", doi = "10.1016/j.susc.2004.04.060" }
Štrbac, S., Johnston, C. M., Lu, G., Crown, A.,& Wiȩckowski, A.. (2004). In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes. in Surface Science Elsevier., 573(1), 80. https://doi.org/10.1016/j.susc.2004.04.060
Štrbac S, Johnston CM, Lu G, Crown A, Wiȩckowski A. In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes. in Surface Science. 2004;573(1):80. doi:10.1016/j.susc.2004.04.060 .
Štrbac, Svetlana, Johnston, Christina Marie, Lu, Guoqiang, Crown, Alechia, Wiȩckowski, Andrzej, "In situ STM study of nanosized Ru and Os islands spontaneously deposited on Pt(111) and Au(111) electrodes" in Surface Science, 573, no. 1 (2004):80, https://doi.org/10.1016/j.susc.2004.04.060 . .