On the role of graphene oxide in bifunctional Ni/MOF/rGO composites in electrochemical nitrate detection and oxygen evolution reaction

Pasarakonda, SL and Ponnada, S and Gorle, DB and Chandra Bose, RS and Palariya, A and Kiai, MS and Gandham, HB and Kathiresan, M and Sharma, RK and Nowduri, A (2022) On the role of graphene oxide in bifunctional Ni/MOF/rGO composites in electrochemical nitrate detection and oxygen evolution reaction. In: New Journal of Chemistry, 47 (2). pp. 725-736.

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Abstract

Metal-organic frameworks as promising porous hybrid materials have been widely used in electrocatalytic applications. Most MOFs' poor electron-conductive and low stability properties would exclude them from being used as electrocatalysts. To overcome these difficulties, in this study, both Ni-MOF and reduced graphene oxide (Ni-MOF/rGO) composites are synthesized by using a simple facile method. The composite modified electrode possesses higher bifunctional catalytic activity for the electrochemical sensing of nitrate and oxygen evolution reaction. The composite was characterized using different analytical techniques such as FTIR, Raman, XRD, SEM, TEM, and XPS analysis. The electrochemical properties of the composite materials were investigated by using electroanalytical techniques in detail. The Ni-MOF/rGO composite modified electrode shows substantial sensitivity (0.08 µA µM-1 cm-2), a wider linear range (5-10 µM), and a lower detection limit (4.018 µM). Further, the Ni-MOF/rGO composite showed superior OER activity with a low overpotential (90 mV) and a small Tafel slope (107 mV dec-1). © 2023 The Royal Society of Chemistry.

Item Type:	Journal Article
Publication:	New Journal of Chemistry
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to the Royal Society of Chemistry.
Keywords:	Catalyst activity; Chemical detection; Electrocatalysts; Electrochemical electrodes; Electrochemical sensors; Electrolytic reduction; Graphene; Hybrid materials; Metal-Organic Frameworks; Nitrates; Stability, Bi-functional; Composite modified electrodes; Electrocatalytic; Electrochemicals; Graphene oxides; Hybrids material; Metalorganic frameworks (MOFs); Nitrate detections; Oxide composites; Reduced graphene oxides, Oxygen
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	31 Jan 2023 04:49
Last Modified:	31 Jan 2023 04:49
URI:	https://eprints.iisc.ac.in/id/eprint/79585

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