Line shape of the stretching vibration of CO adsorbed on rough copper surfaces

Bruckbauer, Andreas; Otto, A.

doi:10.1016/s0039-6028(01)01984-7

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…Because CO 2 and CO are expected to be present on the copper surfaces, as supplementary material (Supporting Information), we presented a summarized discussion on the vibrational modes of CO and CO 2 adsorbed on copper surfaces as reported in the literature. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]…”

Section: Introductionmentioning

confidence: 99%

The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)

Santos

Leite

Brolo

et al. 2016

J. Raman Spectrosc.

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The electrochemical conversion of CO 2 into value-added products using room temperature ionic liquids as solvent/electrolyte has been proposed as an alternative to minimize the environmental effects of CO 2 emissions. A key issue in the design of electrochemical systems for the reduction of CO 2 is the in situ identification of intermediate surface species as well as reaction products. Copper electrodes, besides being used as cathodes in the electrochemical reduction of CO 2 , present surface-enhanced Raman scattering (SERS) when properly activated. In this sense, the electrochemical reduction of CO 2 over a copper electrode in the room temperature ionic liquids 1-n-butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF 4 ) was investigated by cyclic voltammetry and by in situ SERS. The cyclic voltammetries have shown that the presence of CO 2 on the BMI.BF 4 anticipates the reduction of BMI + to the corresponding carbene. Fourier-transform-SERS spectra excited at 1064 nm and SERS spectra excited at 632.8 nm have shown vibrational signals from adsorbed CO. These SERS results indicated that CO adsorbs on the copper surface at two different surface sites. The observation of a 2275 cm À1 vibration in the SERS spectra also confirmed the presence of chemically adsorbed CO 2 . Other products of CO 2 reduction in BMI.BF 4 , besides CO, were identified, including BMI carbene and the BMI-CO 2 adduct. The SERS results also suggest that the presence of a thin film of Cu 2 O on the copper surface anticipates the reduction of CO 2 to CO, an important component of syngas.

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Section: Introductionmentioning

confidence: 99%

The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)

Santos

Leite

Brolo

et al. 2016

J. Raman Spectrosc.

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“…The bands for this specie was presented in Fig. 5d, ν (C-O) (1,912 cm −1 ), ν s (C-O) (2,089 cm −1 ) [55], and ν as (C-O) (2,158 cm −1 ) [56]. Regarding the behavior associated to CO it has been found in the literature [46,47] both an increasing beginning at 0.3 V and a decreasing after 0.6 V. This feature is similar to one in Fig.…”

Section: "In Situ" Raman Resultsmentioning

confidence: 99%

Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study

et al. 2011

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This work presents an "in situ" spectroelectrochemical study of the ethanol oxidation reaction on Pt/C electrocatalysts prepared by the polymeric precursor method. Characterization of the electrocatalysts was performed with X-ray diffraction, Raman spectroscopy, and cyclic voltammetry measurements. The average crystallite size was estimated as 7 nm, in agreement with the value reported in the literature for these types of electrocatalysts. The cyclic voltammetry characterization in an acidic medium presented the expected voltammetric behavior for polycrystalline Pt/C. The ethanol oxidation process was successfully employed "in situ", making use of an optical probe for excitation and collection of the Raman scattering signal. In this configuration it was possible to track the formation of the main products-CO, CO 2 indirectly, acetaldehyde, and acetic acid-and to measure the decay of the ethanol concentration. The results indicate that the optical probe-based Raman spectroscopy technique is a very effective tool for studying "in situ" electrochemical oxidation reactions of ethanol. It might also be a very promising characterization technique for studies of the "in situ" electrochemical oxidation of small organic molecules.

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“…12,13 Other examples of SERS analysis of gases concern gases condensed onto surfaces through substrate cooling, or dissolved in an electrolyte for electrochemical analysis. [14][15][16][17][18] The use of a substrate for Raman gas analysis brings not only the advantage of a significant increase in sensitivity but also several disadvantages. The disadvantages originate from substrate contamination due to filling of analyte adsorption sites resulting in signal drift, loss of function and short lifetime.…”

Section: Introductionmentioning

confidence: 99%

Surface enhanced Raman spectroscopy (SERS) sensors for gas analysis

Rae

Khan

2010

Analyst

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This paper presents work towards a gas sensor based on surface enhanced Raman spectroscopy (SERS). Sensitive SERS analysis of CO and N(2)O was performed using a mixed AgPd nanoparticle substrate that facilitated effective gas adsorption and strong SERS generation. The adsorption, desorption and displacement of both gases from the AgPd substrate were studied. We find that heating/cooling of the AgPd is necessary for CO adsorption but after this step a maximum SERS enhancement factor (EF) of 4 x 10(5) was measured and subsequent desorption and displacement occurred readily. For N(2)O, adsorption occurred at ambient temperature and the maximum SERS EF was 1 x 10(5), but desorption required heating and CO would not displace N(2)O from the surface but was rather co-adsorbed. We conclude that it is necessary to ensure analytes adsorb relatively weakly to the SERS substrate to enable continuous, real-time analysis of multiple analytes and to avoid substrate contamination.

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Line shape of the stretching vibration of CO adsorbed on rough copper surfaces

Cited by 5 publications

References 24 publications

The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)

The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)

Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study

Surface enhanced Raman spectroscopy (SERS) sensors for gas analysis

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Line shape of the stretching vibration of CO adsorbed on rough copper surfaces

Cited by 5 publications

References 24 publications

The electrochemical reduction of CO2 on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF4 ) monitored by surface-enhanced Raman scattering (SERS)

The electrochemical reduction of CO2 on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF4 ) monitored by surface-enhanced Raman scattering (SERS)

Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study

Surface enhanced Raman spectroscopy (SERS) sensors for gas analysis

Contact Info

Product

Resources

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The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)

The electrochemical reduction of CO₂ on a copper electrode in 1-n -butyl-3-methyl imidazolium tetrafluoroborate (BMI.BF₄ ) monitored by surface-enhanced Raman scattering (SERS)