{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22528"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22528","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Coadsorption of anions and ultra-thin metal films on single crystal electrodes","abstract":"This thesis describes results of a combined ultra-high vacuum (UHV)-electrochemistry instrument for structual and compositional surface analysis of anions and ultra-thin metallic films of copper and silver deposited on single crystal electrodes. The anion and metal coverages from the Auger electron spectroscopy (AES) measurements were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown that core-level electron energy loss spectra (CEELS) from adsorbed atomic and ionic adsorbates were electrode potential dependent.","abstract_html":"This thesis describes results of a combined ultra-high vacuum (UHV)-electrochemistry instrument for structual and compositional surface analysis of anions and ultra-thin metallic films of copper and silver deposited on single crystal electrodes. The anion and metal coverages from the Auger electron spectroscopy (AES) measurements were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown that core-level electron energy loss spectra (CEELS) from adsorbed atomic and ionic adsorbates were electrode potential dependent.","abstract_has_math":false,"creators":["Sung, Yung-Eun"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Wieckowski, Andrzej"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:42:44Z","date_published":"2011-05-07T13:42:44Z","updated_at":"2026-07-22T22:25:20Z","subjects":["Chemistry, Analytical","Chemistry, Physical"],"languages":["eng"],"rights":["Copyright 1996 Sung, Yung-Eun"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591200065","AAI9712449","(UMI)AAI9712449"],"render_values":[{"text":"9780591200065","href":null,"code":true},{"text":"AAI9712449","href":null,"code":true},{"text":"(UMI)AAI9712449","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22528","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wieckowski, Andrzej"]},{"key":"dc:creator","label":"Author","values":["Sung, Yung-Eun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:42:44Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chemistry, Analytical","Chemistry, Physical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Sung, Yung-Eun"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591200065","AAI9712449","(UMI)AAI9712449","http://hdl.handle.net/2142/22528"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis describes results of a combined ultra-high vacuum (UHV)-electrochemistry instrument for structual and compositional surface analysis of anions and ultra-thin metallic films of copper and silver deposited on single crystal electrodes. The anion and metal coverages from the Auger electron spectroscopy (AES) measurements were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown that core-level electron energy loss spectra (CEELS) from adsorbed atomic and ionic adsorbates were electrode potential dependent.","Adsorption of (bi)sulfate anions on Au(111), Rh(111), and Pt(111) electrodes in sulfuric acid media was studied. Since the AES ratio of oxygen-to-sulfur in the sulfate adlattice was 4, and the S(LMM) AES transitions and S(L$\\sb {2,3}$) CEELS spectra showed a characteristic S$\\sp{6{+}}$ surface valency. Emersion of the electrode from clean H$\\sb2$S0$\\sb4$ solution to UHV produced a stable Me(111)($\\surd3\\times\\surd$3)R30$\\sp\\circ$ (bi)sulfate surface structure with 0.33 ML coverage for Pt and Rh and 0.20 ML for the Au. The electron density on the adlattice sulfur was higher than that in the salt, evidently due to backdonation of electrons from the substrate to the adsorbate.","Cu UPD on single-crystal Au(111), Pt(111), and Rh(111) electrodes in sulfate-containing electrolytes was studied. A mixed ($\\surd$3 x $\\surd$3) phase consisting of 2/3 ML Cu and 1/3 ML sulfate was found at intermediate electrode potentials, delimited by phase transitions at both higher and lower potentials at Au and Pt electrodes. On Rh(111) however, the ($\\surd$3 x $\\surd$3)R30$\\sp\\circ$ specific to copper coverage and sulfate coadsorption, was not found. This observation, together with the shape of the Rh(111) cyclic voltammogram, different from Au(111) and Pt(111). In the study of interactions of sulfate anions with a Ag/Au(111) surface, silver formed two well-ordered structures, Au(111)p(3 x 3) and Au(111)p(5 x 5). As the potential was made more negative, a series of phase transformations occurred to the adlattice in a fluoric acid solution, from p(3 x 3) and p(5 x 5) to a compressed (5 x 5) and (6 x 6), and to (1 x 1).","Made available in DSpace on 2011-05-07T13:42:44Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712449.pdf: 6822939 bytes, checksum: 2ce639f63cf36c4670893386ed2f84e7 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:14Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:27:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Coadsorption of anions and ultra-thin metal films on single crystal electrodes"]}]}],"canonical_facts":{"dc:contributor":["Wieckowski, Andrzej"],"dc:creator":["Sung, Yung-Eun"],"dc:date":["2011-05-07T13:42:44Z","10000-01-01","1996"],"dc:description":["This thesis describes results of a combined ultra-high vacuum (UHV)-electrochemistry instrument for structual and compositional surface analysis of anions and ultra-thin metallic films of copper and silver deposited on single crystal electrodes. The anion and metal coverages from the Auger electron spectroscopy (AES) measurements were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown that core-level electron energy loss spectra (CEELS) from adsorbed atomic and ionic adsorbates were electrode potential dependent.","Adsorption of (bi)sulfate anions on Au(111), Rh(111), and Pt(111) electrodes in sulfuric acid media was studied. Since the AES ratio of oxygen-to-sulfur in the sulfate adlattice was 4, and the S(LMM) AES transitions and S(L$\\sb {2,3}$) CEELS spectra showed a characteristic S$\\sp{6{+}}$ surface valency. Emersion of the electrode from clean H$\\sb2$S0$\\sb4$ solution to UHV produced a stable Me(111)($\\surd3\\times\\surd$3)R30$\\sp\\circ$ (bi)sulfate surface structure with 0.33 ML coverage for Pt and Rh and 0.20 ML for the Au. The electron density on the adlattice sulfur was higher than that in the salt, evidently due to backdonation of electrons from the substrate to the adsorbate.","Cu UPD on single-crystal Au(111), Pt(111), and Rh(111) electrodes in sulfate-containing electrolytes was studied. A mixed ($\\surd$3 x $\\surd$3) phase consisting of 2/3 ML Cu and 1/3 ML sulfate was found at intermediate electrode potentials, delimited by phase transitions at both higher and lower potentials at Au and Pt electrodes. On Rh(111) however, the ($\\surd$3 x $\\surd$3)R30$\\sp\\circ$ specific to copper coverage and sulfate coadsorption, was not found. This observation, together with the shape of the Rh(111) cyclic voltammogram, different from Au(111) and Pt(111). In the study of interactions of sulfate anions with a Ag/Au(111) surface, silver formed two well-ordered structures, Au(111)p(3 x 3) and Au(111)p(5 x 5). As the potential was made more negative, a series of phase transformations occurred to the adlattice in a fluoric acid solution, from p(3 x 3) and p(5 x 5) to a compressed (5 x 5) and (6 x 6), and to (1 x 1).","Made available in DSpace on 2011-05-07T13:42:44Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712449.pdf: 6822939 bytes, checksum: 2ce639f63cf36c4670893386ed2f84e7 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:14Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:27:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591200065","AAI9712449","(UMI)AAI9712449","http://hdl.handle.net/2142/22528"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Sung, Yung-Eun"],"dc:subject":["Chemistry, Analytical","Chemistry, Physical"],"dc:title":["Coadsorption of anions and ultra-thin metal films on single crystal electrodes"],"dc:type":["text"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:20Z"}