Edge Segregated Polymorphism in 2D Molybdenum Carbide

Advanced Materials
Xiaoxu ZhaoKian Ping Loh

Abstract

Molybdenum carbide (Mo2 C), a class of unterminated MXene, is endowed with rich polymorph chemistry, but the growth conditions of the various polymorphs are not understood. Other than the most commonly observed T-phase Mo2 C, little is known about other phases. Here, Mo2 C crystals are successfully grown consisting of mixed polymorphs and polytypes via a diffusion-mediated mechanism, using liquid copper as the diffusion barrier between the elemental precursors of Mo and C. By controlling the thickness of the copper diffusion barrier layer, the crystal growth can be controlled between a highly uniform AA-stacked T-phase Mo2 C and a "wedding cake" like Mo2 C crystal with spatially delineated zone in which the Bernal-stacked Mo2 C predominate. The atomic structures, as well as the transformations between distinct stackings, are simulated and analyzed using density functional theory (DFT)-based calculations. Bernal-stacked Mo2 C has a d band closer to the Fermi energy, leading to a promising performance in catalysis as verified in hydrogen evolution reaction (HER).

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Citations

Nov 17, 2020·Physical Chemistry Chemical Physics : PCCP·Huan LouGuochun Yang
Oct 3, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xiaoxu ZhaoStephen J Pennycook
Dec 29, 2020·Journal of Hazardous Materials·A T Ezhil VilianYoung-Kyu Han
May 18, 2021·The Journal of Physical Chemistry Letters·Jinyu GanQing Tang
Jul 24, 2021·Biomaterials Science·Xiangping LinTongkai Chen
Aug 22, 2021·Nano-micro Letters·Tianchen QinMingdong Dong

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