Article
Chemistry, Physical
Savio J. Poovathingal, Min Qian, Vanessa J. Murray, Timothy K. Minton
Summary: Pulsed beams containing O and O-2 were directed at a carbon fiber preform network at temperatures in the range, 1023-1823 K, and the products were detected as a function of their velocities and scattering angles. CO was identified as the dominant reactive product, with thermal desorption dynamics and impulsive scattering characteristics observed for different gases.
Article
Chemistry, Inorganic & Nuclear
Sheng-Yu Wang, Jun-Rong Zhang, Meiyuan Guo, Weijie Hua
Summary: This study conducted a multiconfigurational study on the X-ray absorption spectra (XAS) of copper enzyme model complexes to understand the antibonding nature between Cu and O-2 in Cu-O-2 structures. By computing and analyzing the spectral features, the interactions between Cu 3d and O-2 pi*/pi orbitals were explained.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mingming Huang, Man Tang, Jiefeng Hu, Stephen A. Westcott, Udo Radius, Todd B. Marder
Summary: A Cu-catalysed borylation reaction can achieve high-yield synthesis of arylboronic esters from aryl alkyl sulfones, while selective cleavage of cyclic sulfones can be achieved through Cu-mediated or Cu-free processes to prepare sulfonyl-containing boronate esters.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Yuntao Liang, Yuxi Zeng, Xiaofeng Tang, Wu Xia, Biao Song, Fubing Yao, Yang Yang, Yashi Chen, Chuangxin Peng, Chengyun Zhou, Cui Lai
Summary: In this study, Cu and Cu(OH)(2) were loaded on Ni foam using a one-step hydrothermal method to create a cathode for electrochemical reduction of NO3-. The Cu(OH)(2)-Cu/NF electrode exhibited a 91.5% conversion of NO3--N in 90 min and maintained excellent electrochemical performance after 20 cycles. This study provides a novel approach for designing efficient, stable, and inexpensive NO3- reduction electrodes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Profulla Mondol, Christopher J. Barile
Summary: In this study, a non-precious-metal catalyst Cu-GSH-NHFc for the oxygen reduction reaction (ORR) was designed and demonstrated to exhibit enhanced activity. A proposed ORR reaction pathway explained the high selectivity of the Cu-GSH-NHFc catalyst, which opens up new possibilities for future developments in non-precious-metal ORR catalyst design.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Engineering, Chemical
Wenyue Dou, Xianjia Peng, Linghao Kong, Xingyun Hu
Summary: An improved approach of decomplexation, neutralization, and precipitation by NH3·H2O coupling with oxidation by O-2 was explored for the removal of Cu(II) and Cu(I) from acidic copper etching wastewater. The study found that Cu was effectively removed in the form of Cu-2(OH)(3)Cl precipitates under specific treatment conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Applied
Hui Gao, Gong Zhang, Dongfang Cheng, Yongtao Wang, Jing Zhao, Xiaozhi Li, Xiaowei Du, Zhi-Jian Zhao, Tuo Wang, Peng Zhang, Jinlong Gong
Summary: Electrochemical CO2 reduction is a sustainable method for producing multicarbon alcohols. In this study, a Cu electrocatalyst with abundant step sites was designed to suppress the deoxygenation of *CH2CHO and promote alcohol production. The results showed high Faradic efficiency and partial current density for alcohols, as well as a high ratio of alcohols to ethylene in the products. In-situ infrared spectrum characterizations and theoretical calculations revealed that the step sites facilitate C-C coupling and inhibit the cleavage of the C-O bond in *CH2CHO, leading to increased alcohol formation.
CHINESE JOURNAL OF CATALYSIS
(2023)
Article
Crystallography
Darina Kaisheva, Angel Anchev, Vladimir Dunchev, Georgi Kotlarski, Borislav Stoyanov, Maria Ormanova, Stefan Valkov
Summary: This study presents the results of electron-beam welding on copper and Al6082T6 aluminum alloys. The influence of beam scanning geometries on the structure and mechanical properties of the welded joint is investigated. X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to analyze the phase composition, microstructure, and chemical composition of the welded joints. Microhardness investigations were conducted to study the mechanical properties. The results showed that the beam scanning geometries have a significant impact on the weld structure and increased beam oscillation radius led to a decrease in intermetallic phases and improved homogeneity. The microhardness values of the weld joint were higher than the base metals due to the formation of intermetallic phases.
Article
Chemistry, Physical
Diyu Zhang, Charlotte Jansen, Aart W. Kleyn, Ludo B. F. Juurlink
Summary: We investigated the adsorption of O-2 on Cu(111) using supersonic molecular beam techniques and found that the sticking probability varies with incident angle, surface temperature, and coverage. The reactivity of Cu(111) is lower than Cu(110) and Cu(100), and it increases over the entire range of surface temperatures. The coverage dependence on sticking suggests a predominantly direct and dissociative adsorption mechanism.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Denysse Gonzalez Ovalle, Christopher Rock, Christopher Winkler, Devin Hartshorn, Chris Barr, Tristan Cullom, Prithwish Tarafder, Tim Prost, Emma White, Iver Anderson, Tim Horn
Summary: A micro-alloyed copper powder, Cu-0.3Zr-0.15Ag wt%, was produced to reduce the oxygen content on the surface of the powder particles. Solid test articles were fabricated using both as-received powders and intentionally oxidized powders. The addition of zirconium resulted in the formation of discontinuous ZrO2 structures in the metallographic cross-sections.
MATERIALS CHARACTERIZATION
(2023)
Article
Energy & Fuels
Yinting Gu, Chun Han, Jinhua Huang, Vladimir A. Vinokurov, Wei Huang
Summary: In this study, a CuZnAlOOH catalyst with adjustable Cu-0/Cu+ ratios was prepared and two catalysts with different morphologies were obtained. The hydrogenation of intermediates and the production of hydrocarbons were controlled by embedding Cu-0 grains in an oxide flake or wrapping Cu-0 grains in an oxide. The distribution and yield of ethanol synthesis varied depending on surface Cu-0/(Cu-0 + Cu+) ratios.
Article
Chemistry, Physical
Deepa Thomas, Neetu A. Baveja, K. T. Shenoy, J. B. Joshi
Summary: The Copper-Chlorine cycle is identified as the most prospective low temperature thermochemical cycle for hydrogen production, involving thermal and electrochemical steps. Experimental results show similar conversions with Cu2OCl2 and equimolar mixture of CuO-CuCl2 under different conditions, with increasing conversion observed with higher CuCl2 percentage in the reaction mixture.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Agricultural Engineering
Gurmeet Singh, Tuhin S. Khan, Chanchal Samanta, Rajaram Bal, Ankur Bordoloi
Summary: 2-Pentanone has been successfully synthesized from biomass-derived furfural through simultaneous hydrodeoxygenation, ring-opening, and hydrogenation reactions over a bi-metallic Cu-Ni/SBA-15 catalyst in a fixed-bed continuous flow reactor. The catalyst exhibited high activity, selectivity, and stability, yielding 78% of 2-pentanone under mild reaction conditions for up to 20 hours.
BIOMASS & BIOENERGY
(2022)
Article
Materials Science, Multidisciplinary
Jia-Juen Ong, Dinh-Phuc Tran, Shih-Chi Yang, Kai-Cheng Shie, Chih Chen
Summary: The study investigated the effect of 2-step bonding on Cu-Cu microbumps, showing an enhancement in bonding strength and occurrence of ductile fractures after a post-annealing process.
Article
Chemistry, Physical
Chaojiang Li, Shenggui Liu, Xin Jin, Zhen Zuo, Huan Yang, Hao Jing, Xun Cao
Summary: The article introduces a method for preparing catalytic electrodes using laser scanning, and demonstrates the excellent oxygen evolution reaction (OER) activity of the prepared Cu2O-Cu catalyst under alkaline conditions. The research shows that the Cu(OH)(2) passivation layer formed during the preparation process can be easily removed by reduction reactions, with minimal impact on the catalyst's performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
L. Savio, K. B. Bhavitha, G. Bracco, G. Luciano, D. Cavallo, G. Paolini, S. Passaglia, G. Carraro, L. Vattuone, R. Masini, M. Smerieri
Summary: The study investigates highly hydrophobic aluminium surfaces fabricated by chemical etching using Contact Angle Goniometry, Scanning Electron Microscopy, and X-ray Photoelectron Spectroscopy to correlate wettability with morphology and chemical composition. The etched aluminium surfaces exhibit binary structures with nanoscale block-like convexities and hollows, providing more space for air trapping. Results demonstrate that both hierarchical micro/nanostructures and surface composition contribute to excellent hydrophobic properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
R. Davi, G. Carraro, M. Stojkovska, M. Smerieri, L. Savio, M. Lewandowski, J. -J. Gallet, F. Bournel, M. Rocca, L. Vattuone
Summary: Through experiments, we found that at high temperatures CO interacts with the Ni surface to form strongly and weakly interacting graphene in comparable amount, with CO intercalating underneath the latter; at higher temperatures, physisorbed CO2 forms, which we attribute to the onset of the Boudouard reaction under the graphene cover.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
G. Bracco, L. Vattuone, M. Smerieri, G. Carraro, L. Savio, G. Paolini, G. Benedek, P. M. Echenique, M. Rocca
Summary: The current understanding of gas-surface interactions in terms of energy transfer differs from previous models when metal surfaces supporting acoustic surface plasmons are involved, which play a prominent role in energy transfer down to the terahertz region.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Condensed Matter
Giovanni Carraro, Marco Smerieri, Simone Passaglia, Gianangelo Bracco, Luca Vattuone, Mario Rocca, Albano Cossaro, Alberto Verdini, Luca Floreano, Letizia Savio
Summary: This study investigates the adsorption behavior of glutamic acid on TiO2 surface and finds that surface hydroxylation affects the adsorption state. It is suggested that glutamic acid binds to the surface through a carboxylate group.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Natalia Michalak, Tomasz Ossowski, Zygmunt Milosz, Mauricio J. Prieto, Ying Wang, Miroslaw Werwinski, Visnja Babacic, Francesca Genuzio, Luca Vattuone, Adam Kiejna, Thomas Schmidt, Mikolaj Lewandowski
Summary: Ostwald ripening is a common physicochemical phenomenon where smaller particles dissolve and feed the bigger ones. This study provides evidence for Ostwald ripening occurring in an oxide-on-metal system, which is important for understanding heterogeneous catalysis.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Giovanni Carraro, Letizia Savio, Luca Vattuone
Summary: Defects and heteroatoms in single-layer graphene can modify its chemical properties and make it more active in chemistry, catalysis, and sensoristics. Although there have been many theoretical studies, experimental evidence is still limited. This paper reviews the experimental findings on adsorption on graphene defects and heteroatoms, covering various topics.
Article
Chemistry, Physical
Rocco Davi, Giovanni Carraro, Marija Stojkovska, Marco Smerieri, Letizia Savio, Mikolaj Lewandowski, Jean-Jacques Gallet, Fabrice Bournel, Mario Rocca, Luca Vattuone
Summary: This study investigated the interaction between CO and graphene/Ni(1 1 1) as well as the Boudouard reaction at higher pressure using Near Ambient Pressure X-Ray Photoemission Spectroscopy. The results showed that CO intercalated under the graphene layer, causing partial detachment from the Ni substrate, and the formation of CO2 through the Boudouard reaction was observed. Additionally, CO adsorption was found to occur in strongly interacting areas of the graphene layer.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
G. Carraro, S. Passaglia, G. Paolini, G. Bracco, L. Savio, G. Luciano, L. Vattuone, R. Masini, M. Smerieri
Summary: Nowadays, sensors are widely used in everyday life and have become a popular area of research. Energy harvesting from mechanical vibrations, particularly Reverse Electrowetting on Dielectric (REWoD), is a promising technology for miniaturization, providing high power density without requiring external bias. In this study, a portable vibration energy harvesting device using low-cost materials such as Al oxide electrodes and PAAm hydrogels loaded with saline solutions was developed, demonstrating its feasibility and proof of concept.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jose Eduardo Barcelon, Marija Stojkovska, Daniele Perilli, Giovanni Carraro, Marco Smerieri, Luca Vattuone, Mario Rocca, Gianangelo Bracco, Martina Dell'Angela, Roberto Costantini, Albano Cossaro, Luca Vaghi, Antonio Papagni, Cristiana Di Valentin, Letizia Savio
Summary: The Pd cyclometallated complex is deposited on Ag(1 1 0) surface by sublimation, and its thermal evolution on the surface is studied using scanning tunnelling microscopy and X-ray photoemission spectroscopy. The dissociation of the complex leads to a cross coupling reaction between the organic fragments, resulting in the surface assisted synthesis of diphenyl-bipyridine molecules. This process, which has low probability at room temperature, is thermally activated and competes with desorption. The dissociated Br and Cl atoms bind to the surface and induce an extended surface reconstruction upon annealing.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Marija Stojkovska, Daniele Perilli, Jose Eduardo Barcelon, Marco Smerieri, Giovanni Carraro, Thuy Hien Dinh, Luca Vattuone, Mario Rocca, Gianangelo Bracco, Martina Dell'Angela, Roberto Costantini, Albano Cossaro, Luca Vaghi, Antonio Papagni, Cristiana Di Valentin, Letizia Savio
Summary: In this study, the deposition and self-assembly of a Pd-cyclometallated compound on Ag(1 1 0) surface were investigated for the first time. The combination of experimental and theoretical approaches revealed the atomistic details of the chemical steps and the unexpected complex chemistry involved. The mechanistic study highlighted the active role of the metal substrate in promoting the chemistry of the deposited Pd cyclometallates, which could have significant implications for the application of these materials in heterogeneous catalysis.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Elena Spennati, Gabriella Garbarino, Letizia Savio, Luca Vattuone, Paola Riani, Guido Busca
Summary: Catalysts with different cobalt loadings and supports were prepared and characterized. The catalytic activities for CO2 hydrogenation were evaluated, and the results showed that the catalyst with 5 wt% Co on pure gamma-Al2O3 mainly exhibited reverse Water Gas Shift (rWGS) activity, while the catalyst with 13.6 wt% Co on pure gamma-Al2O3 showed methanation activity. The addition of silica decreased the selectivity to CO but enhanced the methanation activity. The 13.6 wt% Co/gamma-Al2O3 catalyst had lower selectivity but higher stability compared to Ni/gamma-Al2O3 catalysts and unsupported cobalt and Co/SiO2 catalysts. The effect of silica on the catalysts was a combination of increasing the total surface area and decreasing the available surface area for cobalt dispersion.
Article
Chemistry, Physical
Rocco Davi, Giovanni Carraro, Marija Stojkovska, Marco Smerieri, Letizia Savio, Jean-Jacques Gallet, Fabrice Bournel, Mario Rocca, Luca Vattuone
Summary: We investigated the influence of vacancies on graphene exposed to CO using synchrotron radiation-induced core level photoemission spectroscopy. CO reacted with graphene to produce additional carbon atoms and CO2. CO intercalates and CO2 molecules bind to vacancies, forming covalently bonded species containing C and O, repairing the defects.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Jose Eduardo Barcelon, Marco Smerieri, Giovanni Carraro, Pawel Wojciechowski, Luca Vattuone, Mario Rocca, Silvia Nappini, Igor Pis, Elena Magnano, Federica Bondino, Luca Vaghi, Antonio Papagni, Letizia Savio
Summary: Graphene nanoribbons (GNRs) with 1D quantum confinement of electrons can be precisely designed and grown using the bottom-up approach, but their stability under operative conditions, including interaction with oxygen, is a critical factor to consider for their application in nanoelectronics.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)