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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.
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]
Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction.
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  Data: <searchLink fieldCode="AR" term="%22Aftab%2C+Umair%22">Aftab, Umair</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> umair.aftab@faculty.muet.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Tahira%2C+Aneela%22">Tahira, Aneela</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gradone%2C+Alessandro%22">Gradone, Alessandro</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Morandi%2C+Vittorio%22">Morandi, Vittorio</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abro%2C+Muhammad+Ishaq%22">Abro, Muhammad Ishaq</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baloch%2C+Muhammad+Moazam%22">Baloch, Muhammad Moazam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bhatti%2C+Adeel+Liaquat%22">Bhatti, Adeel Liaquat</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nafady%2C+Ayman%22">Nafady, Ayman</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vomiero%2C+Alberto%22">Vomiero, Alberto</searchLink><relatesTo>7,8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ibupoto%2C+Zafar+Hussain%22">Ibupoto, Zafar Hussain</searchLink><relatesTo>1,9</relatesTo> (AUTHOR)<i> zaffar.ibhupoto@usindh.edu.pk</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hydrogen+Energy%22">International Journal of Hydrogen Energy</searchLink>. Feb2021, Vol. 46 Issue 13, p9110-9122. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Oxygen+evolution+reactions%22">Oxygen evolution reactions</searchLink><br /><searchLink fieldCode="DE" term="%22High+resolution+electron+microscopy%22">High resolution electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+storage%22">Energy storage</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+hydrogen%22">Atomic hydrogen</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.ijhydene.2020.12.204
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 9110
    Subjects:
      – SubjectFull: Oxygen evolution reactions
        Type: general
      – SubjectFull: High resolution electron microscopy
        Type: general
      – SubjectFull: Composite materials
        Type: general
      – SubjectFull: Energy storage
        Type: general
      – SubjectFull: Atomic hydrogen
        Type: general
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      – TitleFull: Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction.
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              Text: Feb2021
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