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Insights into the formation of metal carbon nanocomposites for energy storage using hybrid NiFe layered double hydroxides as precursors

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Insights into the formation of metal carbon nanocomposites for energy storage using hybrid NiFe layered double hydroxides as precursors

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dc.contributor.author	Romero Pascual, Jorge
dc.contributor.author	Varela, Maria
dc.contributor.author	Assebban, Mhamed
dc.contributor.author	Oestreicher, Víctor
dc.contributor.author	Guedeja-Marrón, Alejandra
dc.contributor.author	Jordá, José L.
dc.contributor.author	Abellán Sáez, Gonzalo
dc.contributor.author	Coronado Miralles, Eugenio
dc.date.accessioned	2021-05-24T14:23:30Z
dc.date.available	2021-05-24T14:23:30Z
dc.date.issued	2020
dc.identifier.citation	Romero Pascual, Jorge Varela, Maria Assebban, Mhamed Oestreicher, Víctor Guedeja-Marrón, Alejandra Jordá, José L. Abellán Sáez, Gonzalo Coronado Miralles, Eugenio 2020 Insights into the formation of metal carbon nanocomposites for energy storage using hybrid NiFe layered double hydroxides as precursors Chemical Science 11 29 7626 7633
dc.identifier.uri	https://hdl.handle.net/10550/79382
dc.description.abstract	NiFe-carbon magnetic nanocomposites prepared using hybrid sebacate intercalated layered double hydroxides (LDHs) as precursors are shown to be of interest as supercapacitors. Here, the low-temperature formation mechanism of these materials has been deciphered by means of a combined study using complementary in situ (temperature-dependent) techniques. Specifically, studies involving X-ray powder diffraction, thermogravimetry coupled to mass spectrometry (TG-MS), statistical Raman spectroscopy (SRS), aberration-corrected scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS) have been carried out. The experimental results confirm the early formation of FeNi3 nanoparticles at ca. 200-250 °C, preceding the concerted collapse of the starting NiFe-LDH laminar structure over just 50 °C (from 350 to 400 °C). At the same time, the catalytic interactions between the metallic atoms and the organic molecules permit the concomitant formation of a graphitic carbon matrix leading to the formation of the final FeNi3-carbon nanocomposite. Furthermore, in situ temperature-dependent experiments in the presence of the intrinsic magnetic field of the STEM-EELS allow observing the complete metal segregation of Ni and Fe even at 400 °C. These results provide fundamental insights into the catalytic formation of carbon-based nanocomposites using LDHs as precursors and pave the way for the fine-tuning of their properties, with special interest in the field of energy storage and conversion.
dc.language.iso	eng
dc.relation.ispartof	Chemical Science, 2020, vol. 11, num. 29, p. 7626-7633
dc.subject	Química
dc.subject	Energia Desenvolupament
dc.title	Insights into the formation of metal carbon nanocomposites for energy storage using hybrid NiFe layered double hydroxides as precursors
dc.type	journal article	es_ES
dc.date.updated	2021-05-24T14:23:30Z
dc.identifier.doi	10.1039/D0SC00697A
dc.identifier.idgrec	139423
dc.rights.accessRights	open access	es_ES