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In-situ growth of nonstoichiometric CrO<sub>0.87</sub> and Co<sub>3</sub>O<sub>4</sub> hybrid system for the enhanced electrocatalytic water splitting in alkaline media
Mehran Univ Engn & Technol, Pakistan.
Mehran Univ Engn & Technol, Pakistan.
Shah Abdul Latif Univ Khairpur Mirs, Pakistan.
Harbin Engn Univ, Peoples R China.
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2023 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 48, no 93, p. 36439-36451Article in journal (Refereed) Published
Abstract [en]

The development of electrocatalysts for electrochemical water splitting has received considerable attention in response to the growing demand for renewable energy sources and environmental concerns. In this study, a simple hydrothermal growth approach was developed for the in-situ growth of non-stoichiometric CrO0.87 and Co3O4 hybrid materials. It is apparent that the morphology of the prepared material shows a heterogeneous aggregate of irregularly shaped nanoparticles. Both CrO0.87 and Co3O4 have cubic crystal structures. Its chemical composition was governed by the presence of Co, Cr, and O as its main constituents. For understanding the role CrO0.87 plays in the half-cell oxygen evolu-tion reaction (OER) in alkaline conditions, CrO0.87 was optimized into Co3O4 nanostructures. The hybrid material with the highest concentration of CrO0.87 was found to be highly efficient at driving OER reactions at 255 mV and 20 mA cm(-2). The optimized material demonstrated excellent durability for 45 h and a Tafel slope of 56 mV dec(-1). Several factors may explain the outstanding performance of CrO0.87 and Co3O4 hybrid materials, including multiple metallic oxidation states, tailored surface properties, fast charge transport, and surface defects. An alternative method is proposed for the preparation of new generations of electrocatalysts for the conversion and storage of energy. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2023. Vol. 48, no 93, p. 36439-36451
Keywords [en]
Nonstoichiometric growth; CrO0.87 and Co3O4 hybrid material; Oxygen evolution reaction
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-199565DOI: 10.1016/j.ijhydene.2023.06.059ISI: 001105608700001OAI: oai:DiVA.org:liu-199565DiVA, id: diva2:1820505
Note

Funding Agencies|King Saud University, Riyadh, Saudi Arabia [RSP2023R79]; Ajman University [2022-IRG-HBS-5]

Available from: 2023-12-18 Created: 2023-12-18 Last updated: 2024-01-08

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Mustafa, Elfatih Mohammed
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Physics, Electronics and MathematicsFaculty of Science & Engineering
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