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Thermoelectrochemical Formation of Fe/Fe3C@Hollow N-Doped Carbon in Molten Salts for Enhanced Catalysis

Abstract

Interaction between iron and nonmetals is a classic topic in industrial iron/steel making and catalysis, in which the modulation of linkage and distribution of iron and nonmetals is a key-enabling factor to develop advanced Fe-based materials. Herein, the hybrid of Fe/Fe3C nanoparticles strongly encapsulated in a nitrogen-doped carbon (N-C) hollow shell is prepared through a thermoelectrochemical treatment of Fe2O3@polydopamine (Fe2O3@PDA) in molten NaCl-CaCl2 at 600 oC. The coupling of thermal pyrolysis of PDA and electrochemical reduction of Fe2O3 contributes to generating Fe/Fe3C species at a relatively low temperature, ensuring structure integrity and in situ N-doping for the hybrid to achieve well-defined hollow structure and abundant active sites of Fe-N and C-N species. The hollow carbon skeleton guarantees efficient mass transfer and maximum exposure of active sites. Consequently, the Fe/Fe3C@N-C exhibits appealing activity for the electrocatalytic hydrogen evolution and Fenton-like reaction, and importantly, can be readily separated for reuse by a magnetic field.

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Supplementary files

Article information


Submitted
14 Jan 2020
Accepted
07 Feb 2020
First published
07 Feb 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Thermoelectrochemical Formation of Fe/Fe3C@Hollow N-Doped Carbon in Molten Salts for Enhanced Catalysis

W. Weng, J. Zhou, D. Gu and W. Xiao, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA00565G

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