Nanoparticles of a Pt3Ni alloy on reduced graphene oxide (RGO) as an oxygen electrode catalyst in a rechargeable Li–O2 battery

Kumar, Surender and Munichandraiah, N (2017) Nanoparticles of a Pt3Ni alloy on reduced graphene oxide (RGO) as an oxygen electrode catalyst in a rechargeable Li–O2 battery. In: Materials Chemistry Frontiers, 1 (5). pp. 873-878. ISSN 2052-1537

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Abstract

Nanoparticles of a Pt3Ni alloy distributed on graphene sheets are studied as a catalyst for the oxygen reduction reaction in non-aqueous Li-O2 cells. The preparation involves simultaneous reduction of graphene oxide and Pt4+ and Ni2+ ions by hydrazine in an ethylene glycol medium. Pt nanoparticles are also prepared separately on reduced graphene oxide (RGO) sheets (Pt-RGO) in addition to Pt3Ni-RGO for studies of comparison. Samples are characterized with various physicochemical techniques. The oxygen reduction reaction (ORR) is studied in a non-aqueous electrolyte by using cyclic voltammetry and rotating disk electrode (RDE) techniques. Pt3Ni-RGO exhibits greater catalytic activity for the ORR when compared with Pt-RGO. O2 reduction follows a one e- pathway (O2 + e- = O2 -) in a non-aqueous electrolyte. The catalytic performances of the samples are investigated in non-aqueous Li-O2 cells. The discharge plateau appears at 2.86 V with the Pt3Ni-RGO catalyst at 0.10 mA cm-2 current density, which is close to the theoretical value of 2.96 V. The overpotential of charging is lower with Pt3Ni-RGO, in comparison to that of Pt-RGO.

Item Type:	Journal Article
Publication:	Materials Chemistry Frontiers
Publisher:	Royal Society of Chemistry
Additional Information:	The Copyright of this article belongs to the Royal Society of Chemistry
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	07 Jun 2022 05:20
Last Modified:	07 Jun 2022 05:20
URI:	https://eprints.iisc.ac.in/id/eprint/72969

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