Ag electrode reaction in NaOH solution studied by in-situ Raman spectroscopy

Iwasaki, Naoya; Sasaki, Yusuke; Nishina, Y.

doi:10.1016/0039-6028(88)90382-2

Cited by 85 publications

(54 citation statements)

References 39 publications

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“…This is caused either by higher oxygen loading, resulting in less charge donation from silver to  * molecular orbital of adsorbed The bands at 870-875 cm -1 could be associated to the bending vibration of Ag-OH hydroxyl groups [42,78] generated in the presence of ppm amounts of H 2 O in the gas flow, while the low frequency bands at 470-475 cm -1 fail in the region of the Ag-O stretching vibration that can be attributed to atomic oxygen species. [39,46] On the other hand, the bands at 338, 603-604 and 790-802 cm -1 observed on Ag(100) at 200ºC and on Ag(111) at 250ºC are associated to subsurface oxo-species and to surface oxygen species (labeled O) stabilized by the presence of subsurface oxygen, [39,[45][46]48] and indicate that oxygen diffusion into the bulk takes place on Ag(100) at a much lower temperature than on Ag(111) facet.…”

Section: Oxygen Activation On Ag(100) and Ag(111) Catalystsmentioning

confidence: 99%

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

Pulido

Concepción

Boronat

et al. 2012

Journal of Catalysis

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Academic Press; ElsevierPulido Junquera, MA.; Concepción Heydorn, P.; Boronat Zaragoza, M.; Corma Canós, A. (2012). Aerobic epoxidation of propene over silver (111) and (100) AbstractCatalytic performance of single crystal Ag(100) and Ag(111) catalysts for propene oxidation has been investigated by means of Raman spectroscopy and mass spectrometry, and the energy profile has been obtained at the DFT-D level. It has been theoretically found, and confirmed by Raman spectroscopy, that Ag(100) surface is more reactive towards O 2 dissociation than Ag(111), and that adsorbed oxo-species are more strongly bonded to the Ag(100) facet. The higher selectivity towards propylene oxide (PO) observed for the Ag(100) catalyst can be rationalized from theoretical calculations indicating that the activation barriers for formation of the allylic intermediate -precursor of combustion products-are rather similar on both silver surfaces, whereas energy barriers on the reaction pathways for formation of PO and carbonylic products (acetone and propanal) are systematically smaller on the Ag (100) surface.

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Section: Oxygen Activation On Ag(100) and Ag(111) Catalystsmentioning

confidence: 99%

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

Pulido

Concepción

Boronat

et al. 2012

Journal of Catalysis

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“…Thus, it was concluded that the Raman intensity for libration might increase with increasing alkali metal and OH ¹ concentrations. [27][28][29] In this cyclic voltammogram, the current responses were found to increase gradually over successive ORCs, which is attributable to the increased roughness of the Ag electrode surface caused by repeated potential cycling. Figure 4 represents the variation of the in situ Raman spectra of the Ag electrode in an aqueous solution with 0.5 mol dm ¹3 NaOH.…”

Section: ¹1mentioning

confidence: 98%

“…According to a previous report, the Raman intensity for bending Electrochemistry, 82(5), 396-400 (2014) vibration of HOH adsorbed on an electrode surface is dependent on electrode potential. 21 It is interesting to see that the intensity of the Raman lines starts to increase at about ¹0.8 V, which correspond to the potential zero charge, 21,28 and becomes higher at more negative values of the electrode potential. This dependence of the intensity of the libration Raman band on the potential is almost the same in both directions of the potential sweep.…”

Section: ¹1mentioning

confidence: 99%

In Situ Surface-enhanced Raman Analysis of Water Libration on Silver Electrode in Various Alkali Hydroxide Aqueous Solutions

et al. 2014

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Water libration on a silver electrode in various alkali hydroxides (MOH, M = Li, Na, K or Cs) aqueous solutions was examined through simultaneous experiments using surface-enhanced Raman scattering (SERS) and electrochemical analysis. This technique, referred to as SERS spectroelectrochemistry, reveals the Raman spectral band between 200 and 750 cm −1 , assignable to water libration on the electrode surface, through electrode potential scanning. The Raman intensity in this spectral band changes with the electrode potential. The variation in Raman intensity of water libration observed when scanning the electrode potential is discussed in terms of water molecules at the electrode interface in various alkali hydroxide aqueous solutions.

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“…Strujni pik A 1 odgovara adsorpciji OH -jona [12][13][14][15]. Strujni pikovi A 4 i A 5 odgovaraju formiranju oksida srebra, najpre Ag 2 O tipa I, zatim Ag 2 O tipa II [16].…”

Section: Btaunclassified

The effect of immersion time in a benzotriazole solution on anodic behaviour of AgCu50 alloy

Grekulović¹,

Rajčić-Vujasinović²,

Stević³

2016

Zas Mat

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UVODOrganski inhibitori se ekstenzivno koriste za zaštitu metala i legura od korozije u različitim sredinama. Među njima, široko je ispitivana efikasnost azola [1][2][3]. Najpoznatiji inhibitor korozije bakra i bakarnih legura iz grupe azola je benzotriazol (BTA). BTA se može naći u tri oblika zavisno od pH vrednosti rastvora [4]. U jako kiseloj sredini je u protonisanom obliku BTAH 2 + u neutralnoj i slabo alkalnoj u obliku BTAH, dok je u jako alkalnoj sredini u obliku BTA -. Za BTA se može reći da je anodni inhibitor korozije bakra čiji mehanizam dejstva podrazumeva hemisorpciju na površini bakra koja sledi model Lengmirove izoterme nakon čega dolazi do formiranja kompleksa Cu(I)BTA.U dostupnoj literaturi je nađen manji broj radova gde je predmet istraživanja bio zaštita srebra od korozije. Hope i sar.[5] su ispitivali ponašanje srebra u cijanidnom rastvoru u prisustvu 2-merkaptobenzotiazola, pri čemu su ustanovili da dolazi do formiranja kompleksa AgMBT. Rajeswaran i sar. Rad je dostupan na sajtu: www.idk.org.rs/casopis su ispitivali prirodu površine kompleksa koji se gradi na srebrnim nanočesticama u vodenom rastvoru u prisustvu benzotriazola, i ustanovili da se molekul benzotriazola vezuje za srebrne nanočestice gradeći kompleks Ag(I)-BTA. Na osnovu literaturnih podataka, može se pretpostaviti da u alkalnim sredinama prisustvo bezotriazola dovodi do formiranja AgBTA kompleksa kao i oksida srebra [7]. EKSPERIMENTALNI DEOEksperimenti su izvedeni na sistemu koji se sastoji od:  elektrohemijske ćelije sa tri elektrode (radna, referentna i pomoćna),  hardvera (PC, AD/DA konvertor PCI-20428 W proizveden od strane Burr-Brown-a i analogni interfejs razvijen na Tehičkom fakultetu u Boru)[8],  softvera za merenje i upravljanje (LabVIEW platforma i specijalno razvijena aplikacija za elektrohemijska merenja) [8].Telo elektrohemijske ćelije je od vatrostalnog pireks stakla, oblika zarubljene kupe. Između zidova cirkuliše tečnost za termostatiranje. Na gornjem delu nalaze se navoji za spajanje poklopca i tela ćelije.V. Grekulović i dr.Uticaj vremena stajanja u rastvoru benzotriazola na anodno ponašanje ... ZASTITA MATERIJALA 57 (2016) broj 4 578 Na poklopcu ćelije nalazi se pet otvora, kroz koje se u ćeliju postavljaju elektrode, termometar i cevčica za uvođenje gasova. Eksperimenti opisani u ovom radu izvedeni su na temperaturi od 25 ± 0,5°C i bez uvođenja azota.U elektrohemijsku ćeliju ispunjenu radnim rastvorom uronjene su:  referentna elektroda -zasićena kalomelska elektroda (ZKE );  radna elektroda (Ag, Cu i legura AgCu50);  pomoćna elektroda -platinska elektroda (platinski lim dimenzija 1x2 cm). Radne elektrode su dobijene od rafinisanih metala (Ag i Cu) čistoće 99,99 % i njihove legure sastava 50 % mas. Ag + 50 % mas. Cu dobijene topljenjem u kvarcnoj peći na temperaturi od 1250 0 C, livenjem i naknadnim hlađenjem. Dobijeni odlivci su zatim tretirani vodenim rastvorom HNO 3 (1:1) radi uklanjanja oksida formiranih pri hlađenju, a nakon toga su podvrgnuti postupcima valjanja i izvlačenja, pri čemu su dobijene ...

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Ag electrode reaction in NaOH solution studied by in-situ Raman spectroscopy

Cited by 85 publications

References 39 publications

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

In Situ Surface-enhanced Raman Analysis of Water Libration on Silver Electrode in Various Alkali Hydroxide Aqueous Solutions

The effect of immersion time in a benzotriazole solution on anodic behaviour of AgCu50 alloy

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