Self-Assembled TMD Nanoparticles on N-Doped Carbon Nanostructures for Oxygen Reduction Reaction and Electrochemical Oxygen Sensing Thereof

Bisen, OY and Atif, S and Mallya, A and Nanda, KK (2021) Self-Assembled TMD Nanoparticles on N-Doped Carbon Nanostructures for Oxygen Reduction Reaction and Electrochemical Oxygen Sensing Thereof. In: ACS Applied Materials and Interfaces .

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Abstract

Here, we report on a universal carbothermal reduction strategy for the synthesis of well-dispersed WS2 nanoparticles (�1.7 nm) supported on a N-doped carbon (NxC) nanostructure and the electrocatalytic activity toward oxygen reduction reaction (ORR). Bulk WS2 powder (2 μm) is the source for WS2 nanoparticles, and dicyandiamide is the source for NxC and carbothermal reduction. Interestingly, WS2/NxC serves the purpose of innovative and robust active sites for ORR through an efficient four-electron transfer process with excellent durability. Remarkably, WS2/NxC suppresses the peroxide generation due to the dominating inner-sphere electron transfer mechanism where the direct adsorption of the desolvated O2 molecule on the electroactive centers takes place. The mass activity (at 0.4 and 0.85 V vs RHE) of WS2/NxC outperforms the previously reported transition metal based electrocatalysts. The study further establishes a correlation between the work function and the ORR activity. We have also exploited WS2/NxC for electrochemical oxygen sensing, and there exists a direct correlation between oxygen sensing and ORR as both depend on the oxygen adsorption ability. Finally, the carbothermal reduction strategy has been extended for the synthesis of other TMDs/NxC such as MoS2/NxC, MoSe2/NxC, and WSe2/NxC. © 2022 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Materials and Interfaces
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Doping (additives); Electrocatalysts; Electrolytic reduction; Electron transport properties; Gas adsorption; Layered semiconductors; Molybdenum compounds; Nanoparticles; Synthesis (chemical); Transition metals; Tungsten compounds, Carbon nano-structures; Doped carbons; Electrocatalytic activity; Highly durable catalyst; N-doped; Oxygen reduction reaction; Reduction strategy; Well-dispersed; WS2nanoparticle; ]+ catalyst, Carbon
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	13 Feb 2022 08:45
Last Modified:	13 Feb 2022 08:45
URI:	http://eprints.iisc.ac.in/id/eprint/71372

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