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2D organ-like molybdenum carbide (MXene) coupled with MoS2 nanoflowers enhances catalytic activity in the hydrogen evolution reaction

Abstract

Two-dimensional (2D) carbides, nitrides and carbonitrides called MXene are noval materials with a lot of useful applications. However, the range of transition metals capable of forming stable MXenes is limited mostly to early transition metals of 3rd-5th groups. To deal with the inaccessibility of MXene phases derived from mid transition metals, we have developed a synthetic strategy that preparing Mo2Ga2C crystal and 2D organ-like Mo2C MXene matrix coupled with MoS2 nanoflowers. Compared with Mo2CTx (where Tx are O, OH, and F surface terminations) MXene catalyst, MoS2@Mo2CTx nanohybrids showed significantly enhanced hydrogen evolution reaction (HER) activity in alkaline media, with a low overpotential of 176 mV at the current density of 10 mA cm-2 and a very small transfer resistance of 26 Ω. Density functional theory (DFT) calculations attribute the enhanced reaction kinetics of MoS2@Mo2CTx to the favorable binding of hydrogen on the oxygen terminated Mo2C surface, which is strongly influenced by MoS2. The synthetic approach illustrates that tailoring the properties of MXenes for a specific application can be achieved via preparing organ-like molybdenum carbide coupled with MoS2 nanoflowers.

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Supplementary files

Article information


Submitted
10 Nov 2019
Accepted
02 Jan 2020
First published
03 Jan 2020

CrystEngComm, 2020, Accepted Manuscript
Article type
Paper

2D organ-like molybdenum carbide (MXene) coupled with MoS2 nanoflowers enhances catalytic activity in the hydrogen evolution reaction

J. Ren, H. Zong, Y. Sun, S. Gong, Y. Feng, Z. Wang, L. Hu, K. Yu and Z. Zhu, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/C9CE01777A

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