Transition Metals Dichalcodenides: Growth mechanism, Structure and Catalytic Activity
Maya Bar Sadan a
a Department of Chemistry, Ben Gurion University, Beer sheva, Israel
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#Sol2D19. Two Dimensional Layered Semiconductors
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Efrat Lifshitz, Cristiane Morais Smith and Doron Naveh
Invited Speaker, Maya Bar Sadan, presentation 309
Publication date: 16th July 2019

The ability to dope 2D layered materials by substituting with various transition metals make transition metals dichalcogenides (TMDs) an interesting system for tailor-made applications. Here, the formation of ternary compounds of TMDs by wet chemistry will be described. Specifically, the doping of TMDs with other transition metals and the impact it has on their catalytic properties for hydrogen production will be presented. The growth mechanism of nanoflowers nanostructures of TMDs was revealed using electron tomography. This growth mechanism allows for facile doping of the materials by adding the dopants either at the beginning or at the end of the reaction, thus forming a homogenous material or a graded one. We have used this approach to dope MoS2 and WSe2 with Ru, Co, Fe, Ni and significantly improved their catalytic activity towards hydrogen production.

In addition, we have surveyed the structural features of various hybrids in order to correlate them with the catalytic activity. This work aims at correlating the atomic-scale structures with the catalytic activity, and for that goal to be achieved, there is a need to understand the dopant sites and the atomic scale arrangement within the MoS2 lattice. The use of high-resolution electron microscopy with other characterization methods allows first the understanding of the structural features of the materials and thereafter it will serve to understand the origin of catalytic activity.

FIG. 1. Functional materials based on TMDs are produced by using various synthetic routes

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