Adsorption of Carbon Monoxide on Pt (335) and (112) Surfaces

Wu, Hong-Zhang; Wang, Zhongni; Wang, Zexin; Diao, Zhaoyu

doi:10.1021/jp905569r

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…4). Also drawn in (c) is a post-dosed CO molecule adsorbing atop partially or even fully H-saturated step sites [3,62,[70][71][72], strongly pushing nearby H atoms at step-edge sites (β 3 -H atoms), and possibly even the nearest H atom adsorbed at FCC sites on the upper terrace, into subsurface tetrahedral and/or octahedral interstitial sites along the speculative dotted purple path(s), in accord with our data on the lower panel of Fig. 5.…”

Section: Further On the Low-temperature β 1 -H Defect Statementioning

confidence: 99%

Weakly-bound hydrogen on defected Pt(111)

2015

Surface Science

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Section: Further On the Low-temperature β 1 -H Defect Statementioning

confidence: 99%

Weakly-bound hydrogen on defected Pt(111)

2015

Surface Science

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“…Pectinase facilitates the breakdown of pectin in cell walls, leading to a more efficient release of β-carotene from chloroplasts. Recent studies have shown that, under specific ultrasonic intensity conditions, low-frequency ultrasonication can enhance the activity of enzyme preparations (Le and Nguyen, 2013;Wu et al, 2014;Wang et al, 2017;Osete-Alcaraz et al, 2019;Larsen et al, 2021;Gamage and Choo, 2023). Therefore, ultrasoundassisted enzymatic extraction (UAEE), which employs the synergistic interaction of enzymatic hydrolysis and ultrasound, could fulfil the requirement for extracting carotenoids from lemon peels.…”

Section: Introductionmentioning

confidence: 99%

Green Extraction of Carotenoids From Lemon Peels

Meral,

Demirdöven

2024

Gıda

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Nowadays, there is a growing interest in fully utilizing agro-industrial wastes, with carotenoids gaining attention as valuable coloring agents. One of the potential sources for carotenoid extraction is lemon peel. The purpose of this study was to determine optimal extraction techniques for extracting as much carotenoids as possible from lemon peel. In this context, a comparison was conducted among extracts obtained via conventional, ultrasound-assisted (UAE), and ultrasound-assisted enzymatic (UAEE) extraction methods. The highest carotenoid content (0.792±0.01 mg/L) was achieved with UAEE, while the lowest (0.493±0.01 mg/L) was obtained conventionally. UAEE exhibited the highest antioxidant activity values among three methods: 753.80±5.79 mg TE/L (ABTS), 624.64±10.52 mg TE/L (DPPH), and 186.64±1.66 μmol TE/L (FRAP). In conclusion, UAEE showed promise in extracting carotenoids from lemon peel. Thus, by carotenoid extraction using green technology from waste lemon peels, with higher added value, richer in terms of phenolic composition and antioxidant properties, has been obtained.

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“…Studies most relevant to this work are summarized below. Because of their unique coordination environment, Pt atoms at step sites and on flat terraces can be electronically different, − which results in higher binding strength of CO molecules adsorbed at on-top sites on the upper part of step sites, compared with that of CO on terrace sites. ,,,,− There are significant differences in the IR spectra of the CO adlayer on stepped Pt surfaces with different terrace widths, revealing that the presence of periodic steps greatly influences the CO adlayer structure . However, previous efforts to interpret the surface structure of adsorbed CO based on the IR spectra have led to contradictory conclusions.…”

Section: Introductionmentioning

confidence: 99%

Electrified Interfaces of Pt(332) and Pt(997) in Acid Containing CO and KI: As Probed by in Situ Scanning Tunneling Microscopy

et al. 2018

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The role of step defects on an electrode is a central issue in the modern study of electrocatalysis. Although scanning tunneling microscopy (STM) has been used to characterize the electrified interfaces of low Millerindexed single-crystal electrodes, there has been little progress in the STM study of stepped Pt electrodes. Herein, the structures of Pt(332) and Pt(997), two vicinal surfaces to the (111) plane, are examined by high-resolution STM under potential control in 0.5 M H 2 SO 4 solution containing iodide or carbon monoxide. These electrodes are annealed by a hydrogen flame and quenched in Millipore water, giving rise to rough step edges with poorly defined atomic structures at 0.1 V (vs reversible hydrogen electrode) in 0.5 M H 2 SO 4 . However, step edges are sharpened and aligned in the ⟨110⟩ direction after adsorption of CO on both electrodes. In contrast, seesaw-like step lines are produced by iodine adsorption. Therefore, the step structure and mobility of Pt atoms are markedly influenced by the adsorbate. Pt(997) and Pt(332) electrodes with (111) facets that are 8 and 5 Pt atoms wide, respectively, afford (√7 × √7)R19.1°−I and (√3 × √3)R30°−I structures at 0.1 V. In comparison, the (2 × 2)−3CO structure, as seen on Pt(111), is found on both Pt electrodes. Also, STM results yield linearly bonded and threefold bonded CO molecules at the peaks and troughs of steps on Pt(332) and Pt(997). The origins for the faster CO oxidation rate at steps than that at terraces are discussed.

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Adsorption of Carbon Monoxide on Pt (335) and (112) Surfaces

Cited by 6 publications

References 30 publications

Weakly-bound hydrogen on defected Pt(111)

Weakly-bound hydrogen on defected Pt(111)

Green Extraction of Carotenoids From Lemon Peels

Electrified Interfaces of Pt(332) and Pt(997) in Acid Containing CO and KI: As Probed by in Situ Scanning Tunneling Microscopy

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