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

Abstract

NiFe-carbon magnetic nanocomposites prepared using hybrid sebacate intercalated layered double hydroxides (LDHs) as precursors have 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 spectroscopy (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 NPs at ca. 200–250 °C, preceding the concerted collapse of the starting NiFe-LDH laminar structure in 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.

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Article information


Submitted
05 Feb 2020
Accepted
23 Mar 2020
First published
24 Mar 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020, Accepted Manuscript
Article type
Edge Article

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

J. Romero, M. Varela, M. Assebban, V. Oestreicher, A. Guedeja-Marrón, J. L. Jorda, G. Abellán and E. Coronado, Chem. Sci., 2020, Accepted Manuscript , DOI: 10.1039/D0SC00697A

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