Insights into the Electrochemical Behavior and Kinetics of NiP@PANI/rGO as a High-Performance Electrode for Alkaline Urea Oxidation

Lera, IL and Khasnabis, S and Wangatia, LM and Olu, FE and Ramamurthy, PC (2022) Insights into the Electrochemical Behavior and Kinetics of NiP@PANI/rGO as a High-Performance Electrode for Alkaline Urea Oxidation. In: Electrocatalysis .

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Abstract

Efficient and low-cost electrocatalyst materials are highly in demand for energy generation from small organic materials. Herein, we developed polyaniline (PANI)/reduced graphene oxide (rGO) (PANI/rGO) as an efficient and low-cost electrocatalyst support material to improve the efficiency of nickel phosphide (NiP) for alkaline urea oxidation via a combination of facile solvothermal method and simple ultrasonic/heat mediated dispersion process. The synthesized electrode material was characterized using HRSEM, XRD, ART-FTIR, UV�VIS spectroscopy, and TGA. The physical characterization revealed the multifaceted phases and microspherical NiP with a particle size of 2.44 µm and dispersed NiP on the surface of support materials. Furthermore, the electrochemical activities of synthesized electrode materials towards alkaline urea oxidation were tested using cyclic voltammetry (CV). The electrochemical study depicts the higher performance of NiP@PANI/rGO in terms of low onset potential (0.292 V), anodic peak potential of 0.427 V to drive a high current density of 15.76 mAcm�2, high electrochemically active surface area (18.29 cm2mg�1), and high stability towards alkaline urea electro-oxidation compared with pristine NiP and NiP@rGO. These significant efficiency improvements of NiP can be ascribed by the synergetic effect between PANI and rGO and higher immobilization of NiP particles on as-synthesized PANI/rGO support material due to strong interaction between Ni2+ and �N.H.�fragments of PANI. Therefore, the higher electrochemical performance of a novel electrode material NiP@PANI/rGO would be a promising candidate for alkaline urea electro-oxidation in direct urea fuel cell applications. Graphic Abstract: Figure not available: see fulltext. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Electrocatalysis
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Mar 2022 06:08
Last Modified:	16 Mar 2022 06:08
URI:	http://eprints.iisc.ac.in/id/eprint/71454

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