Nanosized surface films on brass alloys by XPS and XAES

Cocco, F.; Elsener, Bernhard; Fantauzzi, Marzia; Atzei, Davide; Rossi, Antonella

doi:10.1039/c5ra23135c

Cited by 47 publications

(64 citation statements)

References 35 publications

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“…2014 eV and is characteristic of metallic Zn or Zn-containing alloys. 16,27 It is also clear from the XPS data shown in Table 3 that the 4 h reduction treatment of the catalyst in 5% H2/Ar at 500°C did not result in the removal of chloride species from the MImp and CImp catalysts, since a detectable concentration of Clremained. The apparently slighter higher concentration of Cl present after reduction for the CImp catalyst could be due to strong anchoring of Cl to the substrate, resulting in a higher apparent dispersion of Cl after alloying and the associated particle size changes under the reductive atmosphere.…”

Section: Xps Analysismentioning

confidence: 95%

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Nowicka

Althahban

Luo

et al. 2018

Catal. Sci. Technol.

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Section: Xps Analysismentioning

confidence: 95%

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Nowicka

Althahban

Luo

et al. 2018

Catal. Sci. Technol.

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“…The inhibitory effect on the kinetics of oxygen reduction and on the cathodic current density was found to be particularly strong on brass [21]. XPS surface analysis on "as received" brass alloys revealed a thick oxide film with composition 84% copper oxide and 16% zinc oxide [22], whereas on mechanically polished alloys only a very thin oxide film (<2 nm) is present (Fig. 8, [22]), confirming the influence of the oxide layer on the cathodic oxygen reduction currents and thus on Rp.…”

Section: Mechanistic Interpretationmentioning

confidence: 96%

Determination of the corrosion rate inside historical brass wind instruments – Proof of concept

Elsener

Cocco²,

Fantauzzi³

et al. 2016

Materials & Corrosion

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An electrochemical sensor has been tested on brass reference samples and applied on a mouthpiece of a historical brass instrument. Using a phosphate buffer solution pH 7 with 10−2, 10−3 and 10−4 M NaCl, the electrochemical response (open circuit potential, polarisation resistance) of the sensor corresponds to the results obtained in a traditional electrochemical cell. XPS surface analysis has shown that the brass surface composition after 7 min contact with the sensor is not altered when using 10−3 or 10−4 M NaCl. The sensor is fit for purpose and has already been applied in brass wind instruments.

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“…Considering that the common Cu XPS measurement such as Cu 2p photoemission spectra was not convincible enough to clarify Cu species in different valent state, Cu-LMM Auger spectra recorded according to kinetic energy have been widely employed for distinguishing Cu surface feature. [30][31][32][33] Following the consideration, Cu-LMM spectra of the samples were given in Fig. 2(C).…”

Section: -7mentioning

confidence: 99%

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃

Sun

Zeng

Xing

et al. 2019

NANO

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Deliberately engineering oxide composites on constructing and manipulating interactive structures particularly in surface layers was highly desirable for heterogeneous catalysis. Herein, upon the redox replacement reaction between Ce(IV) precursor (Ce(NO[Formula: see text] and Cu2O nano-substrate, an attempt to directly engineer the surface structure of Cu-based substrate was performed by the Ce(IV)–Cu2O etching-embedding process, then the obtained powders were thermo-treated to get a series of Ce–O–Cu catalysts with different Ce:Cu molar ratios for NH3 selective catalytic reduction (NH3-SCR) of NO. Characterized by ICP-OES, XRD, Raman, XPS, SEM, BET, H2-TPR, NO- and NH3-TPD measurements, it was demonstrated that the Cu–O–Ce catalysts were structured as CuO matrix with an interactive surface composed by co-present Cu(I)–Cu(II) and Ce(III)–Ce(IV) species, even the introduction of Ce was confined in a quite low loading range (0.83–2.3[Formula: see text]wt.%); such a surface exhibited the distinct synergistic effect with positively manipulated physical-chemistry properties such as active site distributions, redox features and surface reactivity compared to pure CuO and traditional Cu–Ce composite catalyst, leading to attractive catalytic performance such as [Formula: see text]% NO conversion with [Formula: see text]% N2 selectivity and the two-fold TOF enhancement versus traditional catalysts, even SO2 was present in reactant mixture on well-manipulated catalyst (Ce loading at 1.6[Formula: see text]wt.%) These results indicated that the etching-embedding strategy illuminated in this work could be referred as a feasible method to directly engineer and construct interactive oxide composite surface for advanced application as well as current efficient Ce–O–Cu catalytic interface for heterogeneous catalysis.

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Nanosized surface films on brass alloys by XPS and XAES

Abstract: Chemical state identification and quantification based on photoelectron spectra is challenging in the case of copper and zinc and their alloys.

Cited by 47 publications

References 35 publications

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Determination of the corrosion rate inside historical brass wind instruments – Proof of concept

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃

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Nanosized surface films on brass alloys by XPS and XAES

Abstract: Chemical state identification and quantification based on photoelectron spectra is challenging in the case of copper and zinc and their alloys.

Cited by 47 publications

References 35 publications

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Highly selective PdZn/ZnO catalysts for the methanol steam reforming reaction

Determination of the corrosion rate inside historical brass wind instruments – Proof of concept

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH3

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Product

Resources

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Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃