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Adding a New Member to the MXene Family: Synthesis, Structure, and Electrocatalytic Activity for the Hydrogen Evolution Reaction of V4C3Tx

Tran, Minh H. and Schäfer, Timo and Shahraei, Ali and Dürrschnabel, Michael and Molina-Luna, Leopoldo and Kramm, Ulrike I. and Birkel, Christina S. (2018):
Adding a New Member to the MXene Family: Synthesis, Structure, and Electrocatalytic Activity for the Hydrogen Evolution Reaction of V4C3Tx.
In: ACS Applied Energy Materials, ACS Publications, pp. 3908-3914, 1, (8), ISSN 2574-0962,
DOI: 10.1021/acsaem.8b00652,
[Online-Edition: https://doi.org/10.1021/acsaem.8b00652],
[Article]

Abstract

Two-dimensional transition-metal-based carbides (or nitrides), so-called MXenes, that can be derived from the three-dimensional MAX phases, have attracted considerable attention throughout the past couple of years. The particular structure together with their hydrophilic and metallic nature make them promising candidates for a plethora of applications, such as sensors, electrodes, and catalysts. Obviously, the respective chemical and physical properties are highly dependent on the chemical composition, stoichiometry, and surface structure of the MXene. Here, we introduce a new member of the MXene family, V4C3Tx (T representing the surface groups), based on the chemical exfoliation of the 413 MAX phase V4AlC3 by treatment with aqueous hydrofluoric acid. X-ray powder diffraction data together with scale-bridging electron microscopy studies prove the successful removal of aluminum from the MAX phase structure. The electrocatalytic activity for the hydrogen evolution reaction of this new MXene is tested in acidic solution over the course of 100 cycles. Interestingly, we find a significant improvement of the catalytic performance over time (i.e., the overpotential required to achieve a current density of 10 mA cm–2 decreases by almost 200 mV) that we assign to the removal of an oxide species from the surface of the MXene, as shown by XPS measurements. Our study provides crucial experimental data of the electrocatalytic activity of MXenes together with the evolution of its surface structure that is also relevant for other transition-metal-based MXenes in the context of further potential applications.

Item Type: Article
Erschienen: 2018
Creators: Tran, Minh H. and Schäfer, Timo and Shahraei, Ali and Dürrschnabel, Michael and Molina-Luna, Leopoldo and Kramm, Ulrike I. and Birkel, Christina S.
Title: Adding a New Member to the MXene Family: Synthesis, Structure, and Electrocatalytic Activity for the Hydrogen Evolution Reaction of V4C3Tx
Language: English
Abstract:

Two-dimensional transition-metal-based carbides (or nitrides), so-called MXenes, that can be derived from the three-dimensional MAX phases, have attracted considerable attention throughout the past couple of years. The particular structure together with their hydrophilic and metallic nature make them promising candidates for a plethora of applications, such as sensors, electrodes, and catalysts. Obviously, the respective chemical and physical properties are highly dependent on the chemical composition, stoichiometry, and surface structure of the MXene. Here, we introduce a new member of the MXene family, V4C3Tx (T representing the surface groups), based on the chemical exfoliation of the 413 MAX phase V4AlC3 by treatment with aqueous hydrofluoric acid. X-ray powder diffraction data together with scale-bridging electron microscopy studies prove the successful removal of aluminum from the MAX phase structure. The electrocatalytic activity for the hydrogen evolution reaction of this new MXene is tested in acidic solution over the course of 100 cycles. Interestingly, we find a significant improvement of the catalytic performance over time (i.e., the overpotential required to achieve a current density of 10 mA cm–2 decreases by almost 200 mV) that we assign to the removal of an oxide species from the surface of the MXene, as shown by XPS measurements. Our study provides crucial experimental data of the electrocatalytic activity of MXenes together with the evolution of its surface structure that is also relevant for other transition-metal-based MXenes in the context of further potential applications.

Journal or Publication Title: ACS Applied Energy Materials
Volume: 1
Number: 8
Publisher: ACS Publications
Uncontrolled Keywords: carbides, electrocatalysis, hydrogen evolution reaction, MAX phase, MXene, V4AlC3, V4C3Tx
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Catalysts and Electrocatalysts
Date Deposited: 10 Dec 2018 11:28
DOI: 10.1021/acsaem.8b00652
Official URL: https://doi.org/10.1021/acsaem.8b00652
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