TY - JOUR AU - Szenti, Imre AU - Efremova, Anastasiia AU - Kiss, János AU - Sápi, András AU - Óvári, László AU - Halasi, Gyula AU - Haselmann, Ulrich AU - Zhang, Zhaoli AU - Morales-Vidal, Jordi AU - Baán, Kornélia AU - Kukovecz, Ákos AU - López, Núria AU - Kónya, Zoltán TI - Pt/MnO Interface Induced Defects for High Reverse Water Gas Shift Activity JF - ANGEWANDTE CHEMIE-INTERNATIONAL EDITION J2 - ANGEW CHEM INT EDIT VL - 63 PY - 2024 IS - 8 PG - 7 SN - 1433-7851 DO - 10.1002/anie.202317343 UR - https://m2.mtmt.hu/api/publication/34471429 ID - 34471429 AB - The implementation of supported metal catalysts heavily relies on the synergistic interactions between metal nanoparticles and the material they are dispersed on. It is clear that interfacial perimeter sites have outstanding skills for turning catalytic reactions over, however, high activity and selectivity of the designed interface‐induced metal distortion can also obtain catalysts for the most crucial industrial processes as evidenced in this paper. Herein, the beneficial synergy established between designed Pt nanoparticles and MnO in the course of the reverse water gas shift (RWGS) reaction resulted in a Pt/MnO catalyst having ~10 times higher activity compared to the reference Pt/SBA‐15 catalyst with >99% CO selectivity. Under activation, a crystal assembly through the metallic Pt (110) and MnO evolved, where the plane distance differences caused a mismatched row structure in softer Pt nanoparticles, which was identified by microscopic and surface‐sensitive spectroscopic characterizations combined with density functional theory simulations. The generated edge dislocations caused the Pt lattice expansion which led to the weakening of the Pt‐CO bond. Even though MnO also exhibited an adverse effect on Pt by lowering the number of exposed metal sites, rapid desorption of the linearly adsorbed CO species governed the performance of the Pt/MnO in the RWGS. LA - English DB - MTMT ER - TY - JOUR AU - Vásárhelyi, Lívia AU - Sebők, Dániel AU - Szenti, Imre AU - Tóth, Ádám AU - Lévay, Sára AU - Vajtai, Róbert AU - Kónya, Zoltán AU - Kukovecz, Ákos TI - Lacunarity as a quantitative measure of mixing—a micro-CT analysis-based case study on granular materials JF - Oxford Open Materials Science VL - 3 PY - 2024 IS - 1 PG - 10 SN - 2633-6979 DO - 10.1093/oxfmat/itad014 UR - https://m2.mtmt.hu/api/publication/34104722 ID - 34104722 N1 - Export Date: 08 March 2024 AB - In practically every industry, mixing is a fundamental process, yet its 3D analysis is scarce in the literature. High-resolution computed tomography (micro-CT) is the perfect X-ray imaging tool to investigate the mixing of granular materials. Other than qualitative analysis, 3D micro-CT images provide an opportunity for quantitative analysis, which is of utmost importance, in terms of efficiency (time and budget), and environmental impact of the mixing process. In this work, lacunarity is proposed as a measure of mixing. By the lacunarity calculation on the repeated micro-CT measurements, a temporal description of the mixing can be given in three dimensions. As opposed to traditional mixing indices, the lacunarity curve provides additional information regarding the spatial distribution of the grains. Discrete element method simulations were also performed and showed similar results to the experiments. LA - English DB - MTMT ER - TY - JOUR AU - Ballai, Gergő AU - Sőrés, Milán Attila AU - Vásárhelyi, Lívia AU - Szenti, Imre AU - Kun, Róbert AU - Hartmann, Bálint AU - Sebők, Dániel AU - Farkas, Ferenc AU - Zahoor, A. AU - Mao, G. AU - Sápi, András AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Exploration of Li-Ion Batteries during a Long-Term Heat Endurance Test Using 3D Temporal Microcomputed Tomography Investigation JF - ENERGY TECHNOLOGY J2 - ENERGY TECHNOL-GER VL - 11 PY - 2023 IS - 8 PG - 10 SN - 2194-4288 DO - 10.1002/ente.202300207 UR - https://m2.mtmt.hu/api/publication/34536297 ID - 34536297 LA - English DB - MTMT ER - TY - JOUR AU - Saker, Ranim AU - Jójártné Laczkovich, Orsolya AU - Regdon, Géza (ifj.) AU - Takács, Tamás AU - Szenti, Imre AU - Bózsity-Faragó, Noémi AU - Zupkó, István AU - Sovány, Tamás TI - Surface Modification of Titanate Nanotubes with a Carboxylic Arm for Further Functionalization Intended to Pharmaceutical Applications JF - PHARMACEUTICS J2 - PHARMACEUTICS VL - 15 PY - 2023 IS - 12 PG - 15 SN - 1999-4923 DO - 10.3390/pharmaceutics15122780 UR - https://m2.mtmt.hu/api/publication/34443794 ID - 34443794 AB - Nanotechnology is playing a significant role in modern life with tremendous potential and promising results in almost every domain, especially the pharmaceutical one. The impressive performance of nanomaterials is shaping the future of science and revolutionizing the traditional concepts of industry and research. Titanate nanotubes (TNTs) are one of these novel entities that became an appropriate choice to apply in several platforms due to their remarkable properties such as preparation simplicity, high stability, good biocompatibility, affordability and low toxicity. Surface modification of these nanotubes is also promoting their superior characters and contributing more to the enhancement of their performance. In this research work, an attempt was made to functionalize the surface of titanate nanotubes with carboxylic groups to increase their surface reactivity and widen the possibility of bonding different molecules that could not be bonded directly. Three carboxylic acids were investigated (trichloroacetic acid, citric acid and acrylic acid), and the prepared composites were examined using FT-IR and Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The toxicity of these functionalized TNTs was also investigated using adherent cancer cell lines and fibroblasts to determine their safety profile and to draw the basic lines for their intended future application. Based on the experimental results, acrylic acid could be the suitable choice for permanent surface modification with multiple carboxylic groups due to its possibility to be polymerized, thus presenting the opportunity to link additional molecules of interest such as polyethylene glycol (PEG) and/or other molecules at the same time. LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Ildikó AU - Veress, G. AU - Szenti, Imre AU - Kukovecz, Ákos TI - Characterization of the solvent specific evaporation from a carbon nanotube buckypaper doped by goethite nanowires JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 389 PY - 2023 PG - 13 SN - 0167-7322 DO - 10.1016/j.molliq.2023.122816 UR - https://m2.mtmt.hu/api/publication/34185545 ID - 34185545 LA - English DB - MTMT ER - TY - JOUR AU - Varga, Gábor AU - Szenti, Imre AU - Kiss, János AU - Baán, Kornélia AU - Halasi, Gyula AU - Óvári, László AU - Szamosvölgyi, Ákos AU - Mucsi, Róbert AU - Dodony, Erzsébet AU - Fogarassy, Zsolt AU - Pécz, Béla AU - Olivi, Luca AU - Sápi, András AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Decisive role of Cu/Co interfaces in copper cobaltite derivatives for high performance CO2 methanation catalyst JF - JOURNAL OF CO2 UTILIZATION J2 - J CO2 UTIL VL - 75 PY - 2023 PG - 13 SN - 2212-9820 DO - 10.1016/j.jcou.2023.102582 UR - https://m2.mtmt.hu/api/publication/34120023 ID - 34120023 AB - Thermo-catalytic bio-SNG (CH4) production is one of the useful tools for converting waste to gaseous fuels through CO2 conversion. To abundant properly, however, efficient, robust and cost-effective catalysts would be required. Bimetallic systems based on transition metals seem to be promising candidates for this task. The CoCu bimetallic system with in-situ generated interfaces was synthesized and used as a catalyst for CO2 methanation. The in-depth analysis of the structure-activity-selectivity relationships involving XRD, (NAP-)XPS, EXAFS and TEM-EDX revealed that the co-existence of Co0, CoO, and Cu0 in the proper distribution on the surface can ensure the selective production of methane. To fine-tune the surface composition of the bimetallic systems, a systematic alteration of the Cu:Co ratio in the precursor spinel structures must be performed. Cu0.4Co2.6O4 derivative, stabilizing subsurface Cu(I)–O specimen, showed the best performance with high activity (12,800 nmol g–1 s–1) and a remarkable selectivity of 65–85% for methane in a wide temperature range (250–425 °C). In studying the mechanistic aspects of methanation, it has been shown that the hydrogenation of active carbon at the surface or below the surface is the key step for the production of methane. So far, this cobalt-catalyzed sub-step has been proposed in catalytic Fischer-Tropsch syntheses. LA - English DB - MTMT ER - TY - JOUR AU - Nagy, Eszter AU - Brigitta, Vőneki AU - Vásárhelyi, Lívia AU - Szenti, Imre AU - Fráter, Márk Tibor AU - Kukovecz, Ákos AU - Antal, Márk Ádám TI - An Exploratory In Vitro Microcomputed Tomographic Investigation of the Efficacy of Semicircular Apicoectomy Performed with Trephine Bur JF - APPLIED SCIENCES-BASEL J2 - APPL SCI-BASEL VL - 13 PY - 2023 IS - 16 PG - 11 SN - 2076-3417 DO - 10.3390/app13169431 UR - https://m2.mtmt.hu/api/publication/34104222 ID - 34104222 N1 - Department of Esthetic and Operative Dentistry, Faculty of Dentistry, University of Szeged, Szeged, 6720, Hungary Department of Applied and Environmental Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Szeged, 6720, Hungary College of Dental Medicine, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates Export Date: 7 October 2023 Correspondence Address: Antal, M.&Á.; Department of Esthetic and Operative Dentistry, Hungary; email: antal.mark@szte.hu LA - English DB - MTMT ER - TY - JOUR AU - Boldizsár, Tamás AU - Bali, Henrik AU - Szenti, Imre AU - Sebők-Papp, Imre AU - Bán, Zsolt AU - Herczeg, Sára AU - Barna, Gábor AU - Sápi, András AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Environmental-Friendly Economical Cordierite-Mullite-based Ceramics for Kiln Furniture Production and Supports for CO2 Hydrogenation towards C5+ fuels JF - JOURNAL OF THE EUROPEAN CERAMIC SOCIETY J2 - J EUR CERAM SOC VL - 43 PY - 2023 IS - 13 SP - 5596 EP - 5605 PG - 10 SN - 0955-2219 DO - 10.1016/j.jeurceramsoc.2023.04.057 UR - https://m2.mtmt.hu/api/publication/33784581 ID - 33784581 LA - English DB - MTMT ER - TY - JOUR AU - Samu, Angelika Anita AU - Szenti, Imre AU - Kukovecz, Ákos AU - Endrődi, Balázs AU - Janáky, Csaba TI - Systematic screening of gas diffusion layers for high performance CO2 electrolysis JF - COMMUNICATIONS CHEMISTRY J2 - COMMUN CHEM VL - 6 PY - 2023 IS - 1 PG - 9 SN - 2399-3669 DO - 10.1038/s42004-023-00836-2 UR - https://m2.mtmt.hu/api/publication/33708159 ID - 33708159 AB - Certain industrially relevant performance metrics of CO 2 electrolyzers have already been approached in recent years. The energy efficiency of CO 2 electrolyzers, however, is yet to be improved, and the reasons behind performance fading must be uncovered. The performance of the electrolyzer cells is strongly affected by their components, among which the gas diffusion electrode is one of the most critical elements. To understand which parameters of the gas diffusion layers (GDLs) affect the cell performance the most, we compared commercially available GDLs in the electrochemical reduction of CO 2 to CO, under identical, fully controlled experimental conditions. By systematically screening the most frequently used GDLs and their counterparts differing in only one parameter, we tested the influence of the microporous layer, the polytetrafluoroethylene content, the thickness, and the orientation of the carbon fibers of the GDLs. The electrochemical results were correlated to different physical/chemical parameters of the GDLs, such as their hydrophobicity and surface cracking. LA - English DB - MTMT ER - TY - JOUR AU - Khoshroo, Ghazaleh AU - Sápi, András AU - Szenti, Imre AU - Efremova, Anastasiia AU - Bali, Henrik AU - Baán, Kornélia AU - Erdőhelyi, A. AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Pure Ni-Based and Trimetallic Ni-Co-Fe Catalysts for the Dry Reforming of Methane: Effect of K Promoter and the Calcination Temperature JF - CATALYSIS LETTERS J2 - CATAL LETT VL - 153 PY - 2023 IS - 9 SP - 2755 EP - 2762 PG - 8 SN - 1011-372X DO - 10.1007/s10562-022-04203-z UR - https://m2.mtmt.hu/api/publication/33545469 ID - 33545469 LA - English DB - MTMT ER -