Role of oxygen functionalities of GO in corrosion protection of metallic Fe

Yadav, A and Kumar, R and Pandey, UP and Sahoo, B (2021) Role of oxygen functionalities of GO in corrosion protection of metallic Fe. In: Carbon, 173 . pp. 350-363.

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Abstract

We demonstrated the mechanism that makes Graphene Oxide (GO) a superior material for corrosion protection over reduced graphene oxide (rGO) and nitrogen doped reduced graphene oxide (N-rGO). According to the results of our electrochemical study, supported by a host of characterization methods and density functional theory (DFT) based calculations, reduction of GO to synthesize rGO or doping of foreign heteroatoms like nitrogen to synthesize N-rGO, exposes and/or creates the defects/pores on the basal carbon plane of GO. Through these defects/pores of rGO and N-rGO, the corrodants react with the metal-surface and corrode it. A subnanometric layer of GO adhered to carbonyl iron (CI) surface through grafting by a thin Glycine (Gly) layer, repels the corrodants and shows robust corrosion protection performance in 1 M KCl solution, over a similar layer of rGO or N-rGO. Hence, our work demonstrate that a coating of GO on metallic Fe surface, grafted via a thin glycine layer, is the economical solution and has the robust performance for its direct industrial application for corrosion protection. © 2020 Elsevier Ltd

Item Type:	Journal Article
Publication:	Carbon
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Keywords:	Amino acids; Chlorine compounds; Density functional theory; Doping (additives); Grafting (chemical); Graphene; Oxygen; Potassium compounds; Reduced Graphene Oxide, Characterization methods; Corrosion protection performance; Electrochemical studies; Metal surfaces; Nitrogen-doped; Reduced graphene oxides (RGO); Robust performance; Subnanometric layers, Corrosion resistant coatings
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Chemical Sciences > Materials Research Centre
Date Deposited:	27 Jan 2021 10:23
Last Modified:	27 Jan 2021 10:23
URI:	http://eprints.iisc.ac.in/id/eprint/67253

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