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Nanofluidic electrolyte based on nitrogen doped reduced graphene oxide as an electrocatalyst for VO2+/VO2+ in vanadium redox flow battery by X. Michel Myures; S. Suresh is a Engineering article available to read on EtoBox.

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Vanadium Redox Flow Battery (VRFB) have garnered significant attention in recent years as a stationary energy storage system, yet its prevalence is hindered by sluggish electron transfer kinetics. Herein, we demonstrate the prospects of nanofluidic electrolyte based on nitrogen doped reduced graphene oxide (N-rGO) as an electrocatalyst for positive half-cell in VRFB. N-rGO with rich nitrogen functional group and structural defect is synthesized through improved Hummers' method, followed by thermal annealing in an inert atmosphere using an eco-friendly nitrogen precursor. The electrochemical kinetics of positive redox pair VO 2 +/VO 2+is found to be improved significantly with nanofluidic electrolyte and were in proportion to the concentration of N-rGO. On comparison with base electrolyte, N-rGO (0.1 wt%) based nanofluidic electrolyte exhibited better electrochemical reversibility, 35 % improvement in peak current density, reduced overpotential and charge transfer resistance by 23 % and 58 % respectively. The enhanced electrochemical performance may be attributed to the enhanced electrochemical surface area and electrical conductivity of N-rGO along with improved hydrophilicity of n

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Author

X. Michel Myures; S. Suresh

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)