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Trimetallic oxide-hydroxide porous nanosheets for efficient water oxidation

Devi, HR and Chikkegowda, R and Rangappa, D and Yadav, AK and Chen, Z and Nanda, KK (2022) Trimetallic oxide-hydroxide porous nanosheets for efficient water oxidation. In: Chemical Engineering Journal, 435 .

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Official URL: https://doi.org/10.1016/j.cej.2022.135019


Multimetallic systems have been the subject of intensive research for their promising electrocatalytic activities. Herein, we describe the synthesis of bimetallic and trimetallic (Ni, Co and Mn) oxide-hydroxide nanosheets and evaluate their catalytic activity toward water oxidation. The catalytic activity of porous trimetallic nanosheets was found to be higher than that of bimetallic hybrids. In addition, the trimetallic systems also possess excellent stability. A current density of 10 mA/cm2 is achieved for an overpotential of 287 mV and �0 loss even after 8000 cycles. The enhanced performance by the trimetallic system can be attributed to the large electrochemical surface area and better intrinsic activity. The electronic modulation in this three-element system is evident from the X-Ray Photoelectron Spectroscopy (XPS) study and Mott-Schottky analysis. The position of flat-band potential plays a significant role in determining the charge transfer kinetics, thereby affecting the water oxidation activity in the semiconductor-electrolyte system. Trimetallic system also offers better oxygen evolution reaction kinetics as evident from the least activation energy compared to the bimetallic counterparts. The local structure system is realized with the X-ray absorption spectroscopy (XAS) analysis. The present study highlights the importance of intrinsic activity in designing efficient non-noble metal electrocatalysts. © 2022 Elsevier B.V.

Item Type: Journal Article
Publication: Chemical Engineering Journal
Publisher: Elsevier B.V.
Additional Information: The copyright for this article belongs to Elsevier B.V.
Keywords: Activation energy; Catalyst activity; Catalytic oxidation; Charge transfer; Cobalt compounds; Electrocatalysts; Electrolytes; Precious metals; Reaction kinetics; X ray absorption spectroscopy; X ray photoelectron spectroscopy, Bimetallics; Electrocatalyst; Electrocatalytic activity; Flat-band potentials; Intensive research; Intrinsic activities; Multimetallic systems; Trimetallic; Trimetallic oxide-hydroxide; Water oxidation, Nanosheets
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 16 Mar 2022 06:05
Last Modified: 16 Mar 2022 06:05
URI: http://eprints.iisc.ac.in/id/eprint/71427

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