XPS and XANES studies of SnO x nanolayers

Domashevskaya, É. P.; Ryabtsev, S. V.; Turishchev, S. Yu.; Кашкаров, В. М.; Yurakov, Yu. A.; Chuvenkova, O. A.; Shchukarev, Andrey

doi:10.1007/s10947-008-0205-2

Cited by 24 publications

(12 citation statements)

References 18 publications

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“…The spectrum of the Sn 3d 5/2 band also shows substructure with a main peak at 486.5 eV, which corresponds to Sn 2+ and a less intense one for Sn 0 at 484.2 eV. The chemical shifts of SnO and SnO 2 are too close to determine the oxidation state. , It was reported that complete oxidation of Sn 0 to Sn 4+ occurs only at elevated temperatures and moist air, and therefore we presume that the oxidized tin is in the Sn 2+ oxidation state. , The thickness that is probed by XPS is 5−10 nm and is larger than the combined thickness of ligand and oxide shell ( ca . 3−3.5 nm).…”

Section: Resultsmentioning

confidence: 85%

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Meissner Effect in Colloidal Pb Nanoparticles

Zolotavin

Guyot‐Sionnest

2010

ACS Nano

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Monodisperse colloidal lead nanoparticles with diameters ranging from 4.4 to 20 nm are prepared by a self-limiting growth method. The nanoparticles are monodispersed and protected from oxidation by an amorphous tin-lead oxide shell of 1.5-2 nm thickness. The magnetic susceptibility of the particles is measured as a function of size, temperature, and magnetic field. The Meissner effect is observed indicating the superconducting transition. For the 20 and 16 nm particles, the critical temperature is suppressed to 6.9 K from the bulk value of 7.2 K and is further reduced for smaller particles. Depending on the size of the particles, the critical field is enhanced by 60-140 times. The superconducting properties agree closely with the theoretical expectations.

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Section: Resultsmentioning

confidence: 85%

“…26,29 It was reported that complete oxidation of Sn 0 to Sn 4ϩ occurs only at elevated temperatures and moist air, and therefore we presume that the oxidized tin is in the Sn 2ϩ oxidation state. 30,31 The thickness that is probed by XPS is 5Ϫ10 nm and is larger than the combined thickness of ligand and oxide shell (ca. 3Ϫ3.5 nm).…”

mentioning

confidence: 99%

Meissner Effect in Colloidal Pb Nanoparticles

Zolotavin

Guyot‐Sionnest

2010

ACS Nano

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“…52 Both catalysts show, besides the main Pd metal peak, small amounts of PdO and PdO 2 in the as-prepared state. 53,54 Residues of the ligands and the ligand-removing agent were not observed in our as-prepared samples, as demonstrated by the absence of the Cl 2p, Br 3d, and Na 1s peaks in the XPS spectra (see Figure S4 in the Supporting Information). After reaction, and without sample exposure to air, it is observed that the Pd component of both catalysts, SnO 2 @Pd NCs and Pd NCs, remains partially oxidized.…”

Section: T H Imentioning

confidence: 80%

Enhanced Formic Acid Oxidation over SnO₂-decorated Pd Nanocubes

et al. 2020

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The formic acid oxidation reaction (FAOR) is one of the key reactions that can be used at the anode of low-temperature liquid fuel cells. To allow the knowledge-driven development of improved catalysts, it is necessary to deeply understand the fundamental aspects of the FAOR, which can be ideally achieved by investigating highly active model catalysts. Here, we studied SnO 2 -decorated Pd nanocubes (NCs) exhibiting excellent electrocatalytic performance for formic acid oxidation in acidic medium with a SnO 2 promotion that boosts the catalytic activity by a factor of 5.8, compared to pure Pd NCs, exhibiting values of 2.46 A mg –1 Pd for SnO 2 @Pd NCs versus 0.42 A mg –1 Pd for the Pd NCs and a 100 mV lower peak potential. By using ex situ, quasi in situ, and operando spectroscopic and microscopic methods (namely, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption fine-structure spectroscopy), we identified that the initially well-defined SnO 2 -decorated Pd nanocubes maintain their structure and composition throughout FAOR. In situ Fourier-transformed infrared spectroscopy revealed a weaker CO adsorption site in the case of the SnO 2 -decorated Pd NCs, compared to the monometallic Pd NCs, enabling a bifunctional reaction mechanism. Therein, SnO 2 provides oxygen species to the Pd surface at low overpotentials, promoting the oxidation of the poisoning CO intermediate and, thus, improving the catalytic performance of Pd. Our SnO x -decorated Pd nanocubes allowed deeper insight into the mechanism of FAOR and hold promise for possible applications in direct formic acid fuel cells.

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“…5d, it is observed that the O 1s spectrum is composed of three peaks at 533.3, 532.08 and 531.18 eV, which are ascribed to O 1s in O 2 , H 2 O and O-Sn bonding of STNs, respectively. 22,52 Combined with the results of TEM, Raman and XPS, it can be concluded that the crystallized carbon is partially formed due to the catalysis of metallic tin.…”

Section: Resultsmentioning

confidence: 91%

Design of SnO₂/C hybrid triple-layer nanospheres as Li-ion battery anodes with high stability and rate capability

Cheng

et al. 2015

J. Mater. Chem. A

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The problems of the large volume change during Li insertion and extraction and poor high-power performance of SnO 2 -based electrodes should be solved for their practical application. Herein, a novel SnO 2 /C hybrid triple-type nanosphere, in which a layer of amorphous carbon was sandwiched between the layers of the SnO 2 and carbon composite, has been designed and fabricated by a top-down approach. Due to its special structure, this kind of SnO 2 -based electrode exhibited a considerable capacitive performance, offering a greatly enhanced cycling stability and rate capability. Its capacity remained as high as 653 mA h g À1 after the 350 th cycle. The irreversible capacity decay was unprecedentedly extended to the 80 th cycle. What is more, this electrode even exhibited a capacity of 260 mA h g À1 at 20 C, with a fading of less than 16% after 600 cycles and less than 22% even after 1000 cycles.

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XPS and XANES studies of SnO x nanolayers

Cited by 24 publications

References 18 publications

Meissner Effect in Colloidal Pb Nanoparticles

Meissner Effect in Colloidal Pb Nanoparticles

Enhanced Formic Acid Oxidation over SnO₂-decorated Pd Nanocubes

Design of SnO₂/C hybrid triple-layer nanospheres as Li-ion battery anodes with high stability and rate capability

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XPS and XANES studies of SnO x nanolayers

Cited by 24 publications

References 18 publications

Meissner Effect in Colloidal Pb Nanoparticles

Meissner Effect in Colloidal Pb Nanoparticles

Enhanced Formic Acid Oxidation over SnO2-decorated Pd Nanocubes

Design of SnO2/C hybrid triple-layer nanospheres as Li-ion battery anodes with high stability and rate capability

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Product

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About

Enhanced Formic Acid Oxidation over SnO₂-decorated Pd Nanocubes

Design of SnO₂/C hybrid triple-layer nanospheres as Li-ion battery anodes with high stability and rate capability