Preparation of N-doped graphene-based electrode via electrochemical method and its application in vanadium redox flow battery


Gursu H., GENÇTEN M. , ŞAHİN Y.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, vol.42, no.12, pp.3851-3860, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 12
  • Publication Date: 2018
  • Doi Number: 10.1002/er.4117
  • Title of Journal : INTERNATIONAL JOURNAL OF ENERGY RESEARCH
  • Page Numbers: pp.3851-3860

Abstract

An N-doped graphene electrode has been prepared by cyclic voltammetric method in 5.0M of HNO3 solution on a graphite-based electrode at room temperature. The modification of the electrode surface with different types of N-containing groups, such as nitro groups, pyrrolic N, and pyridinic N, has been controlled by changing the scanned potential ranges. The formation of an N-doped graphene electrode has been confirmed by scanning electron microscopic, atomic force microscopic, X-ray photoelectron, and Raman spectroscopic methods. The prepared N-doped graphene-modified electrodes have been used in positive electrolyte of a vanadium-based redox flow battery. As positive electrodes, the electrochemically modified electrodes prepared in 5.0M of HNO3 solution -1.0 to (+1.9) and -0.7 to (+1.9) V had more than 140 and 120mA/cm(2) anodic and cathodic peak currents, respectively, in vanadium redox battery. This fast, low-cost, and environmentally friendly method can be used in many application areas, such as optical devices, (bio)sensors, energy storage materials, and electronic devices.