Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction.
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| Title: | Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction. |
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| Authors: | Aftab, Umair1 (AUTHOR) umair.aftab@faculty.muet.edu.pk, Tahira, Aneela2 (AUTHOR), Gradone, Alessandro3,4 (AUTHOR), Morandi, Vittorio3 (AUTHOR), Abro, Muhammad Ishaq1 (AUTHOR), Baloch, Muhammad Moazam1 (AUTHOR), Bhatti, Adeel Liaquat5 (AUTHOR), Nafady, Ayman6 (AUTHOR), Vomiero, Alberto7,8 (AUTHOR), Ibupoto, Zafar Hussain1,9 (AUTHOR) zaffar.ibhupoto@usindh.edu.pk |
| Source: | International Journal of Hydrogen Energy. Feb2021, Vol. 46 Issue 13, p9110-9122. 13p. |
| Subjects: | Oxygen evolution reactions, High resolution electron microscopy, Composite materials, Energy storage, Atomic hydrogen |
| Abstract: | 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 TiO 2 /Co 3 O 4 for efficient OER and overpotential is linearly reduced with increasing amount of TiO 2. 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 Co 3 O 4 nanoparticles. The powder x-ray diffraction revealed a tetragonal phase of TiO 2 and the cubic phase of Co 3 O 4 in the composite materials. Composite samples with increasing TiO 2 content were obtained (18%, 33%, 41% and 65% wt.). Among the composites, cobalt oxide-titanium oxide with the highest TiO 2 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 TiO 2 /Co 3 O 4 material can be useful and interesting for various energy storage and energy conversion systems. The step wise synthesis of composite materials, physical characterization and electrocatalysis. Image 1 • A facile TiO 2 -Co 3 O 4 composite is prepared. • Different crystal habits are found by TEM. • A Tafel slope of 60 mVdec−1 is found. • The composite is durable for 45 h. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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