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Your search keyword '"Fernández García, Marcos"' showing total 76 results
Start Over Author "Fernández García, Marcos" Publisher elsevier bv
76 results on '"Fernández García, Marcos"'

7. Pd-Sn promoted NbOx/TiO2 catalysts for hydrogen photoproduction: Effect of Pd-Sn interaction on charge handling and reaction mechanism

Author

Universidad Autónoma del Estado de México, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Caudillo-Flores, Uriel, Fuentes-Moyado, Sergio, Alonso-Núñez, Gabriel, Barba-Nieto, Irene, Fernández-García, Marcos, Kubacka, Anna, Universidad Autónoma del Estado de México, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Caudillo-Flores, Uriel, Fuentes-Moyado, Sergio, Alonso-Núñez, Gabriel, Barba-Nieto, Irene, Fernández-García, Marcos, and Kubacka, Anna

Abstract

Enhanced performance of Pd in the photocatalytic production of green hydrogen from methanol:water mixtures is achieved through the use of a sn-containing binary co-catalyst. For a Pd:Sn molar ratio of 1:1, the binary co-catalyst leads to an outstanding enhancement of activity under UV, visible and sunlight illumination, rendering a quantum efficiency value of 4 % in the latter case. A core–shell type interaction occurs between Pd metal nanoparticles and Sn oxo-hydroxyde nanoentities, resulting in an electronic modification of both components. The chemical effects of the binary co-catalyst were explored under reaction conditions using infrared spectroscopy. Overall, this study provides evidence that the electronic interaction between Pd and Sn promotes the adsorption and attack of the charge carrier species on the methanol molecule and controls the reaction mechanism, favoring the generation of hydrogen. This new system appears to be a strong candidate in the contribution to the new hydrogen economy through a green and eco-efficient process using renewable energy and reagents. © 2022 The Author(s)

Published
2023

18. Radiometric and angular calibration tests for the MEDA-TIRS radiometer onboard NASA's Mars 2020 mission

Author

Sebastián-Martínez, Eduardo, Martínez, Germán, Ramos, Miguel, Haenschke, F., Ferrándiz, R., Fernández-García, Marcos, Rodríguez Manfredi, J.A., Sebastián-Martínez, Eduardo, Martínez, Germán, Ramos, Miguel, Haenschke, F., Ferrándiz, R., Fernández-García, Marcos, and Rodríguez Manfredi, J.A.

Abstract

This article describes a comprehensive testing method for the radiometric and angular calibration of the Thermal InfraRed Sensor (TIRS) onboard NASA's Mars 2020 mission. First, details of the TIRS opto-mechanical design, construction aspects of the IR detectors, and an update of the mathematical model used for the calculation of sensor internal IR fluxes are provided. Then, a set of sequential calibration tests to identify the radiometer model parameters are defined. The test setups are described, highlighting their limitations and restrictions based on differences between simulated and actual Martian environmental conditions. Finally, the uncertainty sources and potential systematic errors associated with the calibration tests are quantified and compared with the radiometer scientific requirements established by the Mars 2020 science team.

Published
2020

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