Facile NiCo 2 S 4 /C nanocomposite: an efficient material for water oxidation
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Tungsten https://doi.org/10.1007/s42864-020-00066-2
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ORIGINAL PAPER
Facile NiCo2S4/C nanocomposite: an efficient material for water oxidation Umair Aftab1 · Aneela Tahira2 · Raffaello Mazzaro3 · Vittorio Morandi3 · Muhammad Ishaq Abro1 · Muhammad Moazam Baloch1 · Junaid Ali Syed1 · Ayman Nafady4 · Zafar Hussain Ibupoto5 Received: 28 September 2020 / Revised: 12 October 2020 / Accepted: 21 October 2020 © The Nonferrous Metals Society of China 2020
Abstract The water oxidation in alkaline media is a kinetically sluggish process and it requires an active electrocatalyst for overall water splitting which is a challenging task to date. Herein, we formulate a platform for the design of efficient NiCo2S4/C nanocomposite using earth abundant and nonprecious materials. The nanocomposites are prepared by scale up hydrothermal method using different carbon contents from acid dehydrated sucrose. They are structurally and morphologically characterized by various analytic techniques. The scanning electron microscopy has shown few microns flower-like morphology of nanocomposite and hexagonal crystalline phase is identified by X-ray diffraction (XRD). Further, high-resolution transmission electron microscopy supported the XRD results, and C, Ni, Co and O elements were found in the composition nanocomposite as investigated by energy-dispersive spectroscopy. The most active nanocomposite reaches a current density of 20 mA·cm−2 at potential of 285 mV vs reversible hydrogen electrode. The nanocomposite is kinetically supported by 61 mV·dec −1 as small Tafel slope. The nanocomposite is stable and durable for 40 h. The electrochemical impedance spectroscopy described a small charge transfer resistance of 188.4 Ω. These findings suggest that the N iCo2S4/C nanocomposite could be used as a promising material for an extended range of applications particularly in energy technology. Keywords NiCo2S4/C · Water oxidation · Alkaline media · Stable and durable
1 Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42864-020-00066-2) contains supplementary material, which is available to authorized users. * Umair Aftab [email protected] * Zafar Hussain Ibupoto [email protected] 1
Mehran University of Engineering and Technology, Jamshoro 76080, Pakistan
2
Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
3
Institute for Microelectronics and Microsystems, Italian National Research Council, Section of Bologna, 40129 Bologna, Italy
4
College of Science, King Saud University, Riyadh 11451, Saudi Arabia
5
Dr. M.A Kazi Institute of Chemistry, University of Sindh, Jamshoro 76080, Pakistan
The combustion of coal, natural gas and oil releases toxic pollutants in the environment and their resources also deplete with time. To make environment free from carbon emission and to replace the fossil fuels, new renewable energy resources are investigated which should be cost effective, sustainab
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