Structural Changes of 2D FexMn1−xO2 Nanosheets for Low-Temperature Growth of Carbon Nanotubes

Joohyun Lim; Xiaoyan Jin; Seong Ju Hwang; Christina Scheu

doi:10.1002/adfm.202003849

Structural Changes of 2D Fe_xMn₁₋_xO₂ Nanosheets for Low-Temperature Growth of Carbon Nanotubes

Joohyun Lim, Xiaoyan Jin, Seong Ju Hwang, Christina Scheu

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The synthesis of carbon nanotubes (CNTs) is usually done by metallic catalysts with a gaseous carbon precursor at high temperature. Yet, mild synthesis conditions can broaden the application of CNTs and their composites. In the present work, it is unraveled why partially substituted Fe ions in 2D MnO₂ nanosheets lead to the growth of CNTs at low temperatures of 400−500 °C. The local formation of Fe₃C by carbon precursor explains the unusually high catalytic activity of 2D Fe_xMn₁₋_xO₂ nanosheets for preparing CNTs. Finally, Fe₃C is oxidized to Fe₃C/FeO_x yolk/shell morphology in ambient atmosphere after the CNT formation reaction. These results shed light on the development of novel catalyst materials that allow for efficiently prepare CNTs under mild conditions for their wider use in energy-harvesting applications.

Original language	English
Article number	2003849
Journal	Advanced Functional Materials
Volume	30
Issue number	36
DOIs	https://doi.org/10.1002/adfm.202003849
Publication status	Published - 2020 Sept 1

Bibliographical note

Funding Information:
J.L. acknowledges financial support from the Alexander von Humboldt Foundation. This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the government of Korea (MSIP) (no. NRF‐2020R1A2C3008671) and by the government of Korea (MSIT) (no. NRF‐2017R1A5A1015365).

Publisher Copyright:
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1002/adfm.202003849

Cite this

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abstract = "The synthesis of carbon nanotubes (CNTs) is usually done by metallic catalysts with a gaseous carbon precursor at high temperature. Yet, mild synthesis conditions can broaden the application of CNTs and their composites. In the present work, it is unraveled why partially substituted Fe ions in 2D MnO2 nanosheets lead to the growth of CNTs at low temperatures of 400−500 °C. The local formation of Fe3C by carbon precursor explains the unusually high catalytic activity of 2D FexMn1−xO2 nanosheets for preparing CNTs. Finally, Fe3C is oxidized to Fe3C/FeOx yolk/shell morphology in ambient atmosphere after the CNT formation reaction. These results shed light on the development of novel catalyst materials that allow for efficiently prepare CNTs under mild conditions for their wider use in energy-harvesting applications.",

author = "Joohyun Lim and Xiaoyan Jin and Hwang, {Seong Ju} and Christina Scheu",

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AU - Scheu, Christina

N1 - Funding Information: J.L. acknowledges financial support from the Alexander von Humboldt Foundation. This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the government of Korea (MSIP) (no. NRF‐2020R1A2C3008671) and by the government of Korea (MSIT) (no. NRF‐2017R1A5A1015365). Publisher Copyright: © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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N2 - The synthesis of carbon nanotubes (CNTs) is usually done by metallic catalysts with a gaseous carbon precursor at high temperature. Yet, mild synthesis conditions can broaden the application of CNTs and their composites. In the present work, it is unraveled why partially substituted Fe ions in 2D MnO2 nanosheets lead to the growth of CNTs at low temperatures of 400−500 °C. The local formation of Fe3C by carbon precursor explains the unusually high catalytic activity of 2D FexMn1−xO2 nanosheets for preparing CNTs. Finally, Fe3C is oxidized to Fe3C/FeOx yolk/shell morphology in ambient atmosphere after the CNT formation reaction. These results shed light on the development of novel catalyst materials that allow for efficiently prepare CNTs under mild conditions for their wider use in energy-harvesting applications.

AB - The synthesis of carbon nanotubes (CNTs) is usually done by metallic catalysts with a gaseous carbon precursor at high temperature. Yet, mild synthesis conditions can broaden the application of CNTs and their composites. In the present work, it is unraveled why partially substituted Fe ions in 2D MnO2 nanosheets lead to the growth of CNTs at low temperatures of 400−500 °C. The local formation of Fe3C by carbon precursor explains the unusually high catalytic activity of 2D FexMn1−xO2 nanosheets for preparing CNTs. Finally, Fe3C is oxidized to Fe3C/FeOx yolk/shell morphology in ambient atmosphere after the CNT formation reaction. These results shed light on the development of novel catalyst materials that allow for efficiently prepare CNTs under mild conditions for their wider use in energy-harvesting applications.

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