Nanostructured Pt-Doped 2D MoSe2: An Efficient Bifunctional Electrocatalyst for both Hydrogen Evolution and Oxygen Reduction Reactions
Abstract
TMDs are a new family of 2D materials with features that make them appealing for potential applications in nanomaterials science and engineering. Although, the edges of the 2D TMDs show excellent electrocatalytic performance, their basal plane is inert which hinders the industrial applications for electrocatalysis. Here, we have computationally designed the 2D monolayer MoSe2 and studied its electronic properties with electrocatalytic activities. Pt-atom has been doped in the pristine 2D MoSe2 to activate the inert basal plane resulting zero bandgap. This study reveals that the Pt-MoSe2 is an excellent bifunctional electrocatalyst for both the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) with the aid of the DFT. Periodic hybrid DFT method has been applied to compute the electronic properties of both the pristine MoSe2 and Pt-MoSe2. To determine both the HER and ORR mechanisms on the surface of the Pt-MoSe2 material, a non-periodic DFT calculation has been performed by considering a molecular Pt1-Mo9Se21 cluster model. The present study shows that the 2D Pt-MoSe2 follows Volmer-Heyrovsky mechanism for HER with the energy barriers about 9.29 kcal/mol and 10.55 kcal.mol-1 during the H-migration and Heyrovsky reactions. The ORR is achieved by four-electron transfer mechanism with the formation of two transition energy barriers about 14.94 kcal/mol and 11.10 kcal/mol, respectively. The lower energy barriers and high turnover frequency during the reactions expose that the Pt-MoSe2 can be adopted as an efficient bifunctional electrocatalyst for both the HER and ORR. The present studies demonstrate that the exceptional HER and ORR activity and stability performance shown by the MoSe2 electrocatalyst can be enhanced by Pt-doping, opening a promising concept for the sensible design of high-performance catalyst for H2 production and O2 reduction.
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