Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.210
Publication date: 28th August 2024
Metal chalcogenides are key material enablers for renewable energy technologies to decrease the current global reliance on fossil fuels and reduce greenhouse gas emissions.[1,2] However, there is a persistent demand for the development of advanced materials that offer improved efficiency and performance. These innovations are essential for enhancing sustainability and tackling critical global challenges. In the current decade, high entropy chalcogenide nanocrystals (HECh NCs) have emerged as fascinating new materials with remarkable mechanical properties, offering significant potential for a wide range of sustainable energy applications. [3] This class of advanced nanomaterials typically comprise five or more principal elements with nearly- equimolar compositions, that utilizes a high configurational entropy to stabilize multiple elements within a single crystal lattice or sublattice. [4]
Motivated by the growing demand for HEChs, we present the synthesis of 5 and 6 component high entropy metal telluride with PdxCuyTe2 as the principal base. Using PdxCuyTe2 as seed, we design the dimension-controlled colloidal synthesis of (Ni,Cu,Pd,In,Sb)Te and (Ni,Cu,Pd,Ga,Sb,Sn)Te by two-pot diffusion-mediated synthesis at relatively low temperature. The key reaction variables such as precursor reactivity, capping ligands, reaction temperature, and reaction time have been shown to influence the size and shape of the NCs, highlighting the flexibility of the wet chemical synthesis method. The structural and electronic attributes of these materials were evaluated experimentally by XRD, TEM, XPS and UV-Vis spectroscopy. Combined instrumental analyses aided in elucidating the atomic-scale nucleation and growth mechanisms. The synthesized NCs demonstrated exceptional catalytic performance for hydrogen evolution reaction in acidic electrolyte, achieving a current density of 10 mA/cm² at much lower overpotential. The mechanistic insights detailed in this study expands the scope of synergistic properties exhibited by HEChs and will be crucial for advancing the development of innovative, functional HEChs for diverse applications.
I would like to acknowledge my principal advisor, Prof. Shalini Singh for her unwavering support and guidance. I thank my lab members for assistance and IRC-PDF for funding.
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