Scientific Papers in SCI
2023
2023
Nanotecnología en Superficies y Plasma
Improved strain engineering of 2D materials by adamantane plasma polymer encapsulation
Carrascoso, F; Li, H; Obrero-Perez, JM; Aparicio, FJ; Borras, A; Island, JO; Barranco, A; Castellanos-Gómez, ANPJ 2D Materials and Applications, 7 (2023) 24
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Two-dimensional materials present exceptional crystal elasticity and provide an ideal platform to tune electrical and optical properties through the application of strain. Here we extend recent research on strain engineering in monolayer molybdenum disulfide using an adamantane plasma polymer pinning layer to achieve unprecedented crystal strains of 2.8%. Using micro-reflectance spectroscopy, we report maximum strain gauge factors of -99.5 meV/% and -63.5 meV/% for the A and B exciton of monolayer MoS2, respectively, with a 50 nm adamantane capping layer. These results are corroborated with photoluminescence and Raman measurements on the same samples. Taken together, our results indicate that adamantane polymer is an exceptional capping layer to transfer substrate-induced strain to a 2D layer and achieve higher levels of crystal strain.
March, 2023 | DOI: 10.1038/s41699-023-00393-1
Fotocatálisis Heterogénea: Aplicaciones
CO2 Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements
Gonzalez-Rangulan, VV; Reyero, I; Bimbela, F; Romero-Sarria, F; Daturi, M; Gandia, LMCatalysts, 13 (2023) 448
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Renewed interest in CO2 methanation is due to its role within the framework of the Power-to-Methane processes. While the use of nickel-based catalysts for CO2 methanation is well stablished, the support is being subjected to thorough research due to its complex effects. The objective of this work was the study of the influence of the support with a series of catalysts supported on alumina, ceria, ceria-zirconia, and titania. Catalysts' performance has been kinetically and spectroscopically evaluated over a wide range of temperatures (150-500 degrees C). The main results have shown remarkable differences among the catalysts as concerns Ni dispersion, metallic precursor reducibility, basic properties, and catalytic activity. Operando infrared spectroscopy measurements have evidenced the presence of almost the same type of adsorbed species during the course of the reaction, but with different relative intensities. The results indicate that using as support of Ni a reducible metal oxide that is capable of developing the basicity associated with medium-strength basic sites and a suitable balance between metallic sites and centers linked to the support leads to high CO2 methanation activity. In addition, the results obtained by operando FTIR spectroscopy suggest that CO2 methanation follows the formate pathway over the catalysts under consideration.
February, 2023 | DOI: 10.3390/catal13020448
Materiales de Diseño para la Energía y Medioambiente
Improved stability of design clay minerals at high temperature: A comparison study with natural ones
Osuna, FJ; Chaparro, JR; Pavon, E; Alba, MDCeramics International, 49 (2023) 5279-5291
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![](https://icms.us-csic.es/sites/icms.us-csic.es/files/1-s2_364.png)
Clay minerals are ceramics materials that are involved in a wide range of economic uses. But, their structure and composition are modified by heating and, consequently, compromise their final applications. The actual tem-peratures at which changes occur vary greatly from one group to another group and even for different specimens within a given group. The aim of this research has been to evaluate the thermal behaviour of a set of design swelling micas, Na-Mica -n (Mn) and compare them with a set of natural smectites. All samples were heated in the range 200 degrees C to 1000 degrees C; afterwards, they were rehydrated thorough water suspension (0.4% wt). The results have shown that swelling micas have better property of hydration/dehydration than natural clay minerals and those with higher layer charge exhibited higher rehydration ability and dehydration temperature.
February, 2023 | DOI: 10.1016/j.ceramint.2022.10.046
Química de Superficies y Catálisis
Low CO2 hydrogen streams production from formic acid through control of the reaction pH
Santos, JL; Lopez, ER; Ivanova, S; Monzon, A; Centeno, MA; Odriozola, JAChemical Engineering Journal, 455 (2023) 140645
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![](https://icms.us-csic.es/sites/icms.us-csic.es/files/1-s2_375.png)
There are multiple factors that influence the catalyst performance in the reaction of formic acid dehydrogena-tion: the nature of catalyst and/or support, the used solvent and reaction variables such as temperature, time, formic acid concentration, presence/absence of formates and pH of the solution. This work evaluates a series of important parameters like the influence of the pH by itself, the influence of the nature of used alkali agents and the effect of direct formate addition as reactive on hydrogen production via formic acid dehydrogenation over a commercially available catalyst. The catalytic performance appears to depend on the ionic radius of the cations of the used base which reflects consequently on the hydrogen selectivity. The best base to be used must have lower hydrated cationic radii and a starting pH around 4 to achieve important hydrogen selectivity for medium term formic acid conversion.
February, 2023 | DOI: 10.1016/j.cej.2022.140645
Química de Superficies y Catálisis
Spinel ferrite catalysts for CO2 reduction via reverse water gas shift reaction
Navarro, JC; Hurtado, C; Gonzalez-Castano, M; Bobadilla, LF; Ivanova, S; Cumbrera, FL; Centeno, MA; Odriozola, JAJournal of CO2 Utilization, 68 (2023) 102356
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![](https://icms.us-csic.es/sites/icms.us-csic.es/files/1-s2_382.png)
The production of CO via Reverse Water Gas Shift (RWGS) reaction is a suitable route for CO2 valorization. In this study a series of modified spinels AB2O4 (A site symbolscript Ni, Zn and Cu and B symbolscript are investigated as RWGS catalysts and their structure-to-function relationships derived from the changes on the A-site cation are ratio-nalized. For all ferrite systems, the RWGS reaction the process main activity and selectivity is governed by the B -site cation, but the variations on the A-site metals determines catalysts' structural features and stability in the reaction. Among the catalyst series, superior RWGS performance displayed the ferrites modified with Cu and Ni associated to the greater oxygen vacancy population for those spinels enabled by the partial allocation on symbolscript cations into the tetrahedral sites.
February, 2023 | DOI: 10.1016/j.jcou.2022.102356
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