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Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction
Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, Jamshoro, Sindh, 76080, Pakistan.
Department of Science and Technology, Campus Norrköping, Linköping University, Norrköping, SE-60174, Sweden.
CNR-IMM, Via Piero Gobetti 101, Bologna, 40129, Italy. Chemistry Department “G.Ciamician”, University of Bologna, Bologna, 40126, Italy.
CNR-IMM, Via Piero Gobetti 101, Bologna, 40129, Italy.
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2021 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 46, no 13, p. 9110-9122Article in journal (Refereed) Published
Abstract [en]

For an active hydrogen gas generation through water dissociation, the sluggish oxygen evolution reaction (OER) kinetics due to large overpotential is a main hindrance. Herein, a simple approach is used to produce composite material based on TiO2/Co3O4 for efficient OER and overpotential is linearly reduced with increasing amount of TiO2. The scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) investigations reveal the wire like morphology of composite materials, formed by the self-assembly of nanoparticles. The titania nanoparticles were homogenously distributed on the larger Co3O4 nanoparticles. The powder x-ray diffraction revealed a tetragonal phase of TiO2 and the cubic phase of Co3O4 in the composite materials. Composite samples with increasing TiO2 content were obtained (18%, 33%, 41% and 65% wt.). Among the composites, cobalt oxide-titanium oxide with the highest TiO2 content (CT-20) possesses the lowest overpotential for OER with a Tafel slope of 60 mV dec−1 and an exchange current density of 2.98 × 10−3A/cm2. The CT-20 is highly durable for 45 h at different current densities of 10, 20 and 30 mA/cm2. Electrochemical impedance spectroscopy (EIS) confirmed the fast charge transport for the CT-20 sample, which potentially accelerated the OER kinetics. These results based on a two-step methodology for the synthesis of TiO2/Co3O4 material can be useful and interesting for various energy storage and energy conversion systems.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 46, no 13, p. 9110-9122
Keywords [en]
TiO2–Co3O4 composite, Oxygen evolution reaction, Alkaline media, Durability and stability
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Other Physics Topics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-82713DOI: 10.1016/j.ijhydene.2020.12.204ISI: 000617786200004Scopus ID: 2-s2.0-85100050906OAI: oai:DiVA.org:ltu-82713DiVA, id: diva2:1523901
Note

Validerad;2021;Nivå 2;2021-03-22 (johcin);

Finansiär: Higher Education of Pakistan, King Saud University (RSP-2021/79)

Available from: 2021-01-29 Created: 2021-01-29 Last updated: 2021-03-22Bibliographically approved

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Vomiero, Alberto

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