2004
DOI: 10.1021/la0400149
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Adlayer of Hydroquinone on Pt(111) in Solution and in a Vacuum Studied by STM and LEED

Abstract: Hydroquinone (HQ) adlayers were formed on Pt(111) in HF solution and in a vacuum. By using scanning tunneling microscopy (STM) in solution, it was revealed that HQ formed an ordered structure on Pt(111) with a strong attractive interaction between two adjacent hydroxyl groups in neighboring HQ molecules. After the sample was transferred into a vacuum, low-energy electron diffraction (LEED) measurement was performed, which showed that the (2.56 x 2.56)R16 degrees incommensurate structure of the HQ adlayer was f… Show more

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Cited by 19 publications
(38 citation statements)
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“…It is smaller than that observed for Pt(pc) or roughened Pt(111), in accordance with the previous observations [21]. The corresponding coverage is lower than that obtained from Auger electron spectroscopy (0.3 nmol cm )2 [21]) and much lower than that calculated from the structure observed by STM (0.38 nmol cm )2 , [45]). Although this difference may partly be caused by losses due to desorption and experimental errors, changes in pH, differences in supporting electrolyte and, in particular, the presence of H 2 Q may also lead to variable surface coverages.…”
Section: Resultssupporting
confidence: 90%
“…It is smaller than that observed for Pt(pc) or roughened Pt(111), in accordance with the previous observations [21]. The corresponding coverage is lower than that obtained from Auger electron spectroscopy (0.3 nmol cm )2 [21]) and much lower than that calculated from the structure observed by STM (0.38 nmol cm )2 , [45]). Although this difference may partly be caused by losses due to desorption and experimental errors, changes in pH, differences in supporting electrolyte and, in particular, the presence of H 2 Q may also lead to variable surface coverages.…”
Section: Resultssupporting
confidence: 90%
“…[74] Derivatives of benzene such as hydroquinone have also been imaged by STM. [75] Hydroquinone is displaced from polycrystalline Pt and hydrogenated as benzene and cyclohexane, whereas it desorbs from Pt(111) as a nonvolatile species, probably as hydroquinone. [76] Adsorption of benzene on Pd(111) between 0.5 and 0.7 V versus RHE gives rise to a well-ordered Pd(111)-c(2 p 33)rect-C 6 H 6 adlattice like on Pt(111), [61] as shown by STM [77] in benzene-containing solution.…”
Section: à2mentioning
confidence: 99%
“…The resulting adsorbed monolayers have been investigated [20][21][22][23] using STM, LEED, AES, HREELS, FTIR and electrochemistry. In spite those efforts, the chemical identity of Q (ads) is still a subject of controversy [23].…”
Section: Hydrogen-mediated Reductive Desorption Of Q (Ads)mentioning
confidence: 99%
“…In spite those efforts, the chemical identity of Q (ads) is still a subject of controversy [23]. Hubbard [20,22] has shown, using high resolution electron energy loss spectroscopy, that upon adsorption at Pt(1 1 1) electrodes the hydrogen in the hydroxyl groups dissociates from the H 2 Q (aq) molecule.…”
Section: Hydrogen-mediated Reductive Desorption Of Q (Ads)mentioning
confidence: 99%
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