Uniform Distribution of Ruthenium Nanoparticles on Nitrogen-Doped Carbon Nanostructure for Oxygen Reduction Reaction

Bisen, OY and Nanda, KK (2021) Uniform Distribution of Ruthenium Nanoparticles on Nitrogen-Doped Carbon Nanostructure for Oxygen Reduction Reaction. In: ACS Applied Energy Materials, 4 (11). pp. 12191-12200.

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Abstract

Highly efficient, durable, and economically viable electrocatalysts for oxygen reduction reaction (ORR) is central for energy conversion and storage devices such as fuel cells and metal-air batteries. Despite of the enormous recent achievements, it is challenging to achieve satisfactory activity and stability at the same time due to lack of fundamental understanding on the activity governing factors. Here, we demonstrate the mechanistic insight of oxygen reduction on the uniformly dispersed Ru nanoparticles on N-doped carbon support (Ru@NC). The promotion of energy efficient inner-sphere electron transfer mechanism with reduced HO2- generation demonstrates as the crucial descriptor for appreciable activity and remarkable stability. In terms of the mass activity, the developed catalyst outperforms other previously reported state-of-the-art catalysts. The greatly suppressed HO2- generation endows remarkable stability (�6 mV of negative shift in half-wave potential and only 1.9 reduction of activity at 0.9 V after 10000 potential cycles) in alkaline medium. Overall, Ru@NC exhibits remarkably superior stability which is much better than the limit fixed by the U.S. Department of Energy (DOE) and surpasses the state-of-the-art Pt/C catalyst. © 2021 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Carbon; Catalyst activity; Doping (additives); Electrocatalysts; Electrolytic reduction; Energy conversion; Energy efficiency; Fuel cells; Fuel storage; Nitrogen; Oxygen; Ruthenium compounds; Spheres; Virtual storage, Electrocatalyst; Electron transfer; Excellent stability; Inner-sphere electron transfers; Outer-sphere electron transfer; Oxygen reduction reaction; Ru@NC; State of the art; Uniform distribution; ]+ catalyst, Stability
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Dec 2021 05:51
Last Modified:	21 Dec 2021 05:51
URI:	http://eprints.iisc.ac.in/id/eprint/70691

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