Two step synthesis of TiO2–Co3O4 composite for efficient oxygen evolution reaction
| Autor: | Ayman Nafady, Muhammad Moazam Baloch, Alberto Vomiero, Alessandro Gradone, Adeel Liaquat Bhatti, Aneela Tahira, Umair Aftab, Zafar Hussain Ibupoto, Muhammad Ishaq Abro, Vittorio Morandi |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope Settore ING-IND/22 - Scienza e Tecnologia dei Materiali Composite number Energy Engineering and Power Technology Exchange current density 02 engineering and technology Overpotential 010402 general chemistry 01 natural sciences Co3O4 Durability and stability TiO TiO2 composite High-resolution transmission electron microscopy Alkaline media Tafel equation Renewable Energy Sustainability and the Environment Oxygen evolution –Co 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Dielectric spectroscopy Fuel Technology Chemical engineering Oxygen evolution reaction 2 3 O 4 oxygen evolution reaction 0210 nano-technology |
| Zdroj: | International journal of hydrogen energy (2021). doi:10.1016/j.ijhydene.2020.12.204 info:cnr-pdr/source/autori:Umair Aftab, Aneela Tahira, Alessandro Gradone, Vittorio Morandi, Muhammad Ishaq Abro, Muhammad Moazam Baloch, Adeel Liaquat Bhatti, Ayman Nafady, Alberto Vomiero, Zafar Hussain Ibupoto/titolo:Two step synthesis of TiO2eCo3O4composite forefficient oxygen evolution reaction/doi:10.1016%2Fj.ijhydene.2020.12.204/rivista:International journal of hydrogen energy/anno:2021/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.12.204 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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