Polypyrrole@polyaniline-reduced graphene oxide nanocomposite support material and Cobalt for the enhanced electrocatalytic activity of nickel phosphide microsphere towards alkaline urea oxidation

Lera, IL and Khasnabis, S and Wangatia, LM and Femi, OE and Ramamurthy, PC (2021) Polypyrrole@polyaniline-reduced graphene oxide nanocomposite support material and Cobalt for the enhanced electrocatalytic activity of nickel phosphide microsphere towards alkaline urea oxidation. In: Materials Research Express, 8 (9).

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Abstract

Efficient and low-cost materials are highly demanded to improve the sluggish kinetics and stability of direct urea fuel cells for large-scale commercialization. In this study, modification of conventional nickel phoaphide (NiP) by cobalt doping via the facile solvothermal method and simultaneously dispersing prepared cobalt nickel phosphide (CoNiP) on poly (aniline-co-pyrrole)/reduced graphene oxide (PPy@PANI/rGO) as efficient and low-cost support material via simple ultrasonic/heat mediated dispersion process. The synthesized catalysts were characterized by scanning electron microscopy and an x-ray diffractometer. Furthermore, Cyclic Voltammetry tests were conducted to evaluate the performance of synthesized catalysis towards alkaline urea oxidation. The physical characterization depicts the successful formation of NiP and Co-doped NiP microsphere with a particle size of 4.306 μm and 2.04 μm, respectively. In addition, homogeneous distribution of the CoNiP microsphere in the structure of PPy@PANI/rGO support material was achieved. Based on the CV test, the superior electrocatalytic performance of CoNiP@PPy@PANI/rGO electrode material with a potential of 0.414V versus SCE to drive a high current density of 26.92 mAcm-2, lower onset potential of 0.204 V versus SCE, and higher electrochemically active surface area of 2.08 � 10-1 cm2mg-1 were achieved. Furthermore, the electrochemical activities, kinetics, and stability of CoNiP@PPy@PANI/rGO remarkably outperformed the commercial NiP and CoNiP towards alkaline urea electro-oxidation. Therefore, a novel material, CoNiP@PPy@PANI/rGO, is an excellent candidate for anode electrode material in direct urea fuel cells. © 2021 The Author(s). Published by IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Materials Research Express
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to Authors
Keywords:	Alkalinity; Aniline; Anodes; Cobalt compounds; Costs; Cyclic voltammetry; Electrocatalysts; Electrooxidation; Fuel cells; Graphene; Kinetics; Metabolism; Microspheres; Nickel compounds; Particle size; Polyaniline; Polypyrroles; Scanning electron microscopy, Alkalines; Cobalt-nickel phosphide; Efficient costs; Electrocatalyst; Onset potential; Reduced graphene oxides; Support materials; Synthesised; Urea fuels; Urea oxidation, Urea
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Nov 2021 09:48
Last Modified:	29 Nov 2021 09:48
URI:	http://eprints.iisc.ac.in/id/eprint/70285

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