Systematic CuL2,3-edge and OK-edge XANES spectroscopy study on the infinite-layer superconductor system, (Sr,La)CuO2

Tanaka, Yoshiaki; Karppinen, Maarit; Lee, J.M.; Liu, Ru‐Shi; Chen, J.M.; Yamauchi, H.

doi:10.1016/j.ssc.2008.06.024

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…To probe the chemical states of these regions at high spatial resolution, we carried out electron energy-loss spectroscopy (EELS) in the STEM mode. The white-line ratios of the Cu L 2,3 edges (2p to 3d transition) a fingerprint of the oxidation state of Cuare presented in Figure h. The EELS spectra from the nanoparticle (red curve) and amorphous matrix (black curve) gave L 3 /L 2 peak intensity ratios of 1.67 and 2.73, corresponding to Cu 0 and Cu 2+ , respectively .…”

Section: Resultsmentioning

confidence: 97%

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst

et al. 2023

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Electrocatalytic carbon dioxide reduction (CO2R) in neutral electrolytes can mitigate the energy and carbon losses caused by carbonate formation but often experiences unsatisfied multicarbon selectivity and reaction rates because of the kinetic limitation to the critical carbon monoxide (CO)–CO coupling step. Here, we describe that a dual-phase copper-based catalyst with abundant Cu(I) sites at the amorphous–nanocrystalline interfaces, which is electrochemically robust in reducing environments, can enhance chloride-specific adsorption and consequently mediate local *CO coverage for improved CO–CO coupling kinetics. Using this catalyst design strategy, we demonstrate efficient multicarbon production from CO2R in a neutral potassium chloride electrolyte (pH ∼6.6) with a high Faradaic efficiency of 81% and a partial current density of 322 milliamperes per square centimeter. This catalyst is stable after 45 h of operation at current densities relevant to commercial CO2 electrolysis (300 mA per square centimeter).

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Section: Resultsmentioning

confidence: 97%

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst

et al. 2023

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“…The following materials are available online at https://www.mdpi.com/ article/10.3390/heritage5030137/s1. Figure S1: X-ray diffractograms (Co anode) of the studied tesserae; Figure S2: Linear combination fitting of XANES spectra at Cu K-edge of monochrome tesserae; Figure S3: SEM images with AsB detection of undissolved raw material in sample 25 (a) in an orange area and (b) in a red area; Figure S4: XANES spectra at Cu L3-edge for crystalline references; Table S1: Composition (wt%) measured by LA-ICP-MS reported from Schibille et al [24] supplementary information; Figure S5: Optical absorption spectra measured in reflexion with integrating sphere of Noheda red and orange samples; Figure S6: Ternary diagram for SiO2-Cu2O-PbO systems in equilibrium with metallic copper [45]; Figure S7: Pairs of elements for all red and orange tesserae samples from Noheda villa, from Schibille et al, 2020 [24] Supplementary Information ( [48][49][50][51][52][53][54]).…”

Section: Supplementary Materialsmentioning

confidence: 99%

Comparative Investigation of Red and Orange Roman Tesserae: Role of Cu and Pb in Colour Formation

et al. 2022

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This study aims at the characterisation of red and orange glass tesserae from the 4th-century Roman villa of Noheda (Spain). Due to the limited number of analyses available for such ancient materials, many questions remain unanswered about the production processes in the Roman period. Six samples were chosen for their hue variations, including two samples showing banded patterns of red and orange. Differences in copper speciation were investigated by X-ray absorption spectroscopy and compared with colour and compositional variations obtained by EPMA. The shapes and sizes of colouring crystals could be investigated using scanning and transmission electron microscope imaging. The brown-red colour is due to metallic copper nano-particles and corresponds to a low-copper and low-lead group usually described in the literature. The orange samples and bands are coloured by copper oxide Cu2O nanoparticles with remaining Cu+ in the glass and have greater contents of Cu. Compositional analyses reveal that the same base glass is used in the red and orange bands with additions of Cu, Sn, Pb and probable Fe. Furthermore, based on our results and on the literature review, a high-copper low-lead group of glasses highlights the variability of compositions observed in cuprite colours.

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Morphology, Atomic and Electronic Structure of Metal Oxide (CuO x , SnO x ) Nanocomposites and Thin Films

Yalovega

Shmatko

Funik

et al. 2015

Springer Proceedings in Physics

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Systematic CuL2,3-edge and OK-edge XANES spectroscopy study on the infinite-layer superconductor system, (Sr,La)CuO2

Cited by 10 publications

References 30 publications

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst

Comparative Investigation of Red and Orange Roman Tesserae: Role of Cu and Pb in Colour Formation

Morphology, Atomic and Electronic Structure of Metal Oxide (CuO x , SnO x ) Nanocomposites and Thin Films

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Systematic CuL2,3-edge and OK-edge XANES spectroscopy study on the infinite-layer superconductor system, (Sr,La)CuO2

Cited by 10 publications

References 30 publications

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO2 Electroreduction over a Dual-Phase Copper Catalyst

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO2 Electroreduction over a Dual-Phase Copper Catalyst

Comparative Investigation of Red and Orange Roman Tesserae: Role of Cu and Pb in Colour Formation

Morphology, Atomic and Electronic Structure of Metal Oxide (CuO x , SnO x ) Nanocomposites and Thin Films

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Product

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Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst

Highly Enhanced Chloride Adsorption Mediates Efficient Neutral CO₂ Electroreduction over a Dual-Phase Copper Catalyst