Article
Chemistry, Physical
Christos Chatzilias, Eftychia Martino, Alexandros Katsaounis, Constantinos G. Vayenas
Summary: The study investigated the electrochemical promotion of CO2 hydrogenation using a monolithic electropromoted reactor with nine electrochemical cells. The results showed that under high reactant flowrates and temperatures, the electropromotion significantly affected the methane selectivity and yield. The experimental results on the monolithic reactor successfully scaled up the laboratory-scale EPOC studies of CO2 hydrogenation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Christos Chatzilias, Eftychia Martino, Sotirios Tsatsos, Georgios Kyriakou, Alexandros Katsaounis, Constantinos G. Vayenas
Summary: In this study, the kinetic mechanism of CO2 hydrogenation was investigated using a scaled up electropromoted reactor loaded with nine Ru/YSZ/Au electrochemical cells. The results show that the partial pressures of H2 and CO2 have a significant impact on the product distribution and reaction rate. Additionally, the experiment validates the charge transfer behavior during the electrochemical promotion process.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Andriana Lymperi, Christos Chatzilias, Fotios Xydas, Eftychia Martino, Georgios Kyriakou, Alexandros Katsaounis
Summary: The hydrogenation of CO2 is crucial for sustainable fuel production and greenhouse gas reduction. Electrochemical promotion of catalysis (EPOC) has shown potential in improving catalytic activity and selectivity in this reaction. Designing an effective electrocatalytic reactor remains a challenge, but the use of a low-temperature solid oxide electrolyte fuel cell (SOFC) reactor has been studied for promoting CO2 hydrogenation.
Article
Chemistry, Physical
Alexander A. Khechfe, Mark M. Sullivan, Dimitrios Zagoraios, Alexandros Katsaounis, Constantinos G. Vayenas, Yuriy Roman-Leshkov
Summary: This study demonstrates the non-Faradaic electrochemical promotion of a Bronsted acid-catalyzed reaction over a metal oxide surface. The promotion is believed to originate from the generation of Bronsted acid sites localized to the three-phase boundary at the catalyst/gas/electrolyte interface and/or acid site strengthening due to electrical polarization. The effect is reversible and does not appear to permanently alter the chemistry of the Mo film.
Article
Chemistry, Applied
D. Grigoriou, D. Zagoraios, A. Katsaounis, C. G. Vayenas
Summary: This study demonstrates the role of solid electrolytes in supporting ruthenium during CO2 hydrogenation through Electrochemical Promotion of Catalysis (EPOC), leading to the development of a new supported Ru-Co catalyst for the production of higher hydrocarbons.
Article
Materials Science, Coatings & Films
Akeem Y. Adesina, Q. A. Drmosh, A. Madhan Kumar, Amar K. Mohamedkhair
Summary: The study demonstrates that tungsten oxide thin films exhibit optimal protective properties at an annealing temperature of 400 degrees C, with excellent corrosion resistance in both chloride and sulfuric acid environments.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Shangtao Zhang, Jian Wang, Rong Wu, Boting Pan, Lang Liu, Chunhai Liu
Summary: Transition metal nitrides, specifically zirconium nitride (ZrN) thin films, were fabricated using reactive direct-current (DC) magnetron sputtering and their morphology and electrochemical capacitive performance as electrode materials for supercapacitors were investigated. The films exhibited a continuous and homogeneous structure with a fine columnar morphology. The T3 film electrode showed the highest areal specific capacitance of 1.19 mF cm(-2) at a current density of 0.05 mA cm(-2) due to its higher porosity, better wettability, and lower charge transfer resistance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Ke Wang, Liang Wu, Zikun Xu, Zhihong Lu, Rui Xiong
Summary: We investigate the extraordinary Hall effect of sputtered amorphous ferrimagnetic GdFeCo alloy films using a composite target method. The sign of the extraordinary Hall resistance changes from positive to negative as the alloy film transitions from FeCo-rich to Gd-rich phase. The large extraordinary Hall coefficient indicates the potential applications of amorphous ferrimagnetic GdFeCo alloy films in perpendicular magnetoelectronic devices.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Nikoleta Kokkinou, Fotios Xydas, Susanne Brosda, Georgios Kyriakou, Alexandros Katsaounis
Summary: Electrochemical promotion was used to enhance the activity and selectivity of a Rh catalyst electrode in the CO2 hydrogenation reaction. Experiments were conducted at temperatures ranging from 350 to 430 degrees Celsius and with varying CO2 to H2 gas feeding ratios. The main reaction products observed were CO and CH4, and their formation rates were influenced by the applied potential or current. The results demonstrate the potential of electrochemical promotion for fine-tuning the activity and selectivity of reactions with significant technical and environmental importance.
Article
Environmental Sciences
A. Bakalem, F. Bouhezila, O. Kitous, M. Drouiche, N. Mameri
Summary: The paper aims to design an efficient and low-cost electrocoagulation reactor with aluminum microbipolar electrodes, showing significantly improved performance in batch mode compared to conventional reactors. Under optimal operating conditions, the reactor achieved a dye removal percentage of approximately 96% in continuous mode.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Chunmeng Dong, Dong Jiang, Yanlong Fu, Desheng Wang, Qinqin Wang, Lijun Weng, Ming Hu, Xiaoming Gao, Jiayi Sun
Summary: By pinning the edge planes of MoS2 with nanospheres, an incommensurate structure is formed between adjacent rolling nanoparticles, reducing friction and achieving macro-superlubricity.
Article
Materials Science, Multidisciplinary
Saksorn Limwichean, Pitak Eiamchai, Chatchai Ponchio, Nat Kasayapanand, Mati Horprathum
Summary: The study compared the WO3 thin films deposited by DCMS and HiPIMS techniques, with the latter showing better film structures and stability after annealing. The WO3 thin film prepared by HiPIMS displayed higher photocurrent and stability due to its preferred crystalline structure, indicating the potential of HiPIMS deposition technique for semiconductor films in energy and environmental applications.
Article
Materials Science, Multidisciplinary
A. Collado-Hernandez, M. Garcia-Mendez, M. I. Mendivil-Palma, C. Gomez-Rodriguez, D. Fernandez-Gonzalez, L. V. Garcia-Quinonez
Summary: One drawback of untreated Sb2S3 thin films is the lack of crystallinity, which can be improved by laser irradiation. In this study, RF-sputtered Sb2S3 thin films were treated with a continuous CO2 laser. The laser treatment resulted in crystallization and a change in sample morphology from cracked to more dense/homogeneous. The structural and morphological changes induced by laser irradiation also improved the optical and electrical properties, including an increase in optical and photoconductivity properties.
Article
Engineering, Electrical & Electronic
Yufeng Huang, Weihua Wu, Shengqing Xu, Xiaoqin Zhu, Sannian Song, Zhitang Song
Summary: By reducing the thickness of Sb thin films, the crystallization temperature, electrical resistance, activation energy, and data retention capacity increased significantly. The optical band gap energy increased and the surface became smoother. The smaller grain size indicated potential inhibition of crystallization with decreased film thickness. The thinner Sb films exhibited larger threshold switching voltage and smaller RESET operation voltage, suggesting better thermal stability and lower power consumption for phase-change memories.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
I Hotovy, L. Spiess, M. Mikolasek, I Kostic, M. Sojkova, H. Romanus, M. Hulman, D. Buc, V Rehacek
Summary: The study presents investigations on the structural, optical, and electrical properties of layered WS2 films synthesized on tungsten. The results show that the thickness of the W films and the sulfurization temperature affect the microstructure and electrical properties of the WS2 films.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Analytical
A. Papaderakis, N. Pliatsikas, P. Patsalas, D. Tsiplakides, S. Balomenou, A. Touni, S. Sotiropoulos
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2018)
Article
Chemistry, Physical
Eirini Zagoraiou, Maria K. Daletou, Labrini Sygellou, Stella Ballomenou, Stylianos G. Neophytides
APPLIED CATALYSIS B-ENVIRONMENTAL
(2019)
Article
Chemistry, Physical
Dingkai Chen, Basma Mewafy, Fotios Paloukis, Liping Zhong, Vasiliki Papaefthimiou, Thierry Dintzer, Kalliopi M. Papazisi, Stella P. Balomenou, Dimitrios Tsiplakides, Detre Teschner, Virginia Perez-Dieste, Carlos Escudero, Spyridon Zafeiratos
JOURNAL OF CATALYSIS
(2020)
Article
Electrochemistry
T. Subburaj, W. Brevet, F. Farmakis, D. Tsiplakides, S. Balomenou, N. Strataki, C. Elmasides, B. Samaniego, M. Nestoridi
ELECTROCHIMICA ACTA
(2020)
Article
Chemistry, Multidisciplinary
Dimitrios A. Giannakoudalds, Juan Carlos Colmenares, Dimitrios Tsiplakides, Konstantinos S. Triantafyllidis
Summary: The electrochemical oxidation of HMF to FDCA presents a promising and sustainable alternative in the field of biomass valorization, with potential for higher efficiency through the rational design of nanocatalysts and nanoengineered anodes. Additionally, combining heterogeneous photocatalysis with photoelectrodes can reduce the reliance on external voltage and further enhance the overall reaction efficiency.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Naouma Bimpiri, Argyro Konstantinidou, Dimitrios Tsiplakides, Stella Balomenou, Kalliopi Maria Papazisi
Summary: In this study, the lifetime issue of silicon-based thin film solar cell is explored by investigating the hydrogen evolution reaction on platinum electrode. By analyzing the steady-state current and voltage change of the cell, it is found that the platinum electrode undergoes oxidation and reduction processes over a longer period of study, leading to a decrease in efficiency. These results reveal the functionality and degradation mechanism of the platinum electrode in hydrogen evolution.
Article
Biochemistry & Molecular Biology
Angeliki Banti, Kalliopi Maria Papazisi, Stella Balomenou, Dimitrios Tsiplakides
Summary: This study investigates the performance of unsupported IrO2 electrocatalysts with different particle sizes synthesized by the modified Adams method in the oxygen evolution reaction (OER) and as anode electrodes for proton exchange membrane (PEM) water electrolyzers. The synthesized electrocatalysts are characterized using X-ray diffraction, Brunauer-Emmett-Teller surface area measurement, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical performance is evaluated using cyclic voltammetry and linear sweep voltammetry, and the materials are further evaluated as anode electrodes in a typical electrolytic cell. The results show that the IrO2 electrocatalyst calcined at 400°C exhibits high crystallinity, a small particle size (1.24 nm), a high specific surface area (185 m(2) g(-1)), and a high activity (177 mA cm(-2) at 1.8 V) for PEM water electrolysis.
Proceedings Paper
Materials Science, Multidisciplinary
K. M. Papazisi, M. E. Farmaki, D. Tsiplakides, S. Balomenou
MATERIALS TODAY-PROCEEDINGS
(2018)
Article
Engineering, Environmental
Vasiliki Kitsiou, George A. Zachariadis, Dimitra A. Lambropoulou, Dimitrios Tsiplakides, Ioannis Poulios
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2018)
Proceedings Paper
Electrochemistry
Kalliopi Maria Papazisi, Dimitrios Tsiplakides, Stella Balomenou, Ivar Waernhus, Crina S. Ilea, Arild Vik, Max Schautz
11TH EUROPEAN SPACE POWER CONFERENCE
(2017)
Proceedings Paper
Electrochemistry
Ivar Waernhus, Crina S. Ilea, Arild Vik, Dimitrios Tsiplakides, Stella Balomenou, Kalliopi Papazisi, Max Schautz
11TH EUROPEAN SPACE POWER CONFERENCE
(2017)
Article
Nanoscience & Nanotechnology
Fotios Paloukis, Kalliopi M. Papazisi, Thierry Dintzer, Vasiliki Papaefthimiou, Viktoriia A. Saveleva, Stella P. Balomenou, Dimitrios Tsiplakides, Fabrice Bournel, Jean-Jacques Gallet, Spyridon Zafeiratos
ACS APPLIED MATERIALS & INTERFACES
(2017)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
