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Title: Trimetallic oxide-hydroxide porous nanosheets for efficient water oxidation
Authors: Devi, Hemam Rachna
Chikkegowda, Ramachandra
Rangappa, Dinesh
Yadav, Ashok Kumar
Chen, Zhong
Nanda, Karuna Kar
Keywords: Engineering::Materials
Issue Date: 2022
Source: Devi, H. R., Chikkegowda, R., Rangappa, D., Yadav, A. K., Chen, Z. & Nanda, K. K. (2022). Trimetallic oxide-hydroxide porous nanosheets for efficient water oxidation. Chemical Engineering Journal, 435, 135019-.
Project: RG15/16 
Journal: Chemical Engineering Journal 
Abstract: 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.
ISSN: 1385-8947
DOI: 10.1016/j.cej.2022.135019
Schools: School of Materials Science and Engineering 
Rights: © 2022 Elsevier B.V. All rights reserved.
Fulltext Permission: embargo_20240508
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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