Predominantly enhanced catalytic activities of surface protected ZnO nanorods integrated stainless-steel mesh structures: A synergistic impact on oxygen evolution reaction process

Nandanapalli, KR and Mudusu, D and Karuppannan, R and Hahn, Y-B and Lee, S (2022) Predominantly enhanced catalytic activities of surface protected ZnO nanorods integrated stainless-steel mesh structures: A synergistic impact on oxygen evolution reaction process. In: Chemical Engineering Journal, 429 .

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Abstract

The realization of efficient and durable catalyst-based energy harvesting devices by integrating low-cost materials with low-temperature techniques has recently received great attention. In this direction, we developed synergistic Oxygen evolution reaction (OER) catalysts by combining low-cost surface passivated or functionalized ZnO nanorods (F. ZnO NRs) structures with stainless-steel mesh (SSM/F. ZnO NRs) as three-dimensional (3D) structures and demonstrated excellent water-splitting characteristics. Here, SSM/ZnO nanorods structures were initially passivated by electrochemical deposition of ultrathin cobalt oxide (Co3O4) layers and analyzed with advanced analytical techniques even before and after OER catalysis. As individual materials, either stainless-steel or Co3O4 deposited ZnO nanostructures possess very low catalytic activity, whereas their integrated 3D structures showed unusual catalytic performance as OER anodes. As compared to SSM and SSM/ZnO structures, Co3O4 passivated SSM/ZnO structures exhibit very low overpotential (�290 V for the current density of 10 mA/cm2) with a reduced Tafel slope of 59 mV/dec along with excellent cycling stability and durability even for longtime energy productions. The establishment of large surface-area and fine energy band alignments along with favorable interfaces formed between SSM, ZnO@Co3O4, and electrolyte||Pt structures, presence of Co3O4 as a passive cum protective layer, and synergistic effects play significant roles in the predominantly enhanced catalytic activity of SSM/F. ZnO electrodes. © 2021 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:	Catalysis; Catalyst activity; Cobalt compounds; Cost effectiveness; Electrochemical deposition; Electrochemical electrodes; Electrolytes; Energy harvesting; Fuel cells; II-VI semiconductors; Low temperature effects; Mesh generation; Nanorods; Oxygen; Reduction; Slope stability; Stainless steel; Zinc oxide, 3D Structure; Cost effective; Cost-effective oxygen evolution reaction electrode; Electrochemical catalysis; Enhanced catalytic activity; Functionalized; Low temperature synthesis; Stainless steel mesh; ZnO nanorod; ]+ catalyst, Temperature
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	03 Dec 2021 08:23
Last Modified:	03 Dec 2021 08:23
URI:	http://eprints.iisc.ac.in/id/eprint/70186

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