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Title: Needle grass array of nanostructured nickel cobalt sulfide electrode for clean energy generation
Authors: Zequine, Camila 
Bhoyate, Sanket 
Siam, Khamis 
Kahol, Pawan K. 
Kostoglou, Nikolaos 
Mitterer, Christian 
Hinder, Steven J. 
Baker, Mark A. 
Constantinides, Georgios 
Rebholz, Claus 
Gupta, Gautam 
Li, Xianglin 
Gupta, Ram K. 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: HER;NiCo-OH;NiCo2S4;OER;Water electrolysis
Issue Date: 25-Nov-2018
Source: Surface and Coatings Technology, 2018, vol. 354, pp. 306-312
Volume: 354
Start page: 306
End page: 312
Journal: Surface and Coatings Technology 
Abstract: Significant efforts have been focused on the search of earth-abundant elements to solve growing energy issues and to provide bifunctional behavior for both hydrogen and oxygen evolution reaction. Mixed transition metals could provide promising synergistic electrochemical properties and serve as bi-catalyst for overall water splitting process. In this study, a needle grass array of nanostructured nickel cobalt sulfide (NiCo2S4) was synthesized using a hydrothermal process. The synthesized NiCo2S4 electrodes showed promising electrocatalytic activity with a low overpotential of 148 mV and 293 mV for hydrogen and oxygen evolution reactions, respectively. The electrolyzer cell consisting of two NiCo2S4 electrodes displayed excellent performance with high electrochemical stability and low overall cell potential of 1.61 V to achieve a current density of 10 mA/cm2. Our study suggests that mixed transition metal chalcogenides such as NiCo2S4 could be used as efficient and stable electrocatalyst for overall water splitting process.
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2018.09.045
Rights: © Elsevier B.V.
Type: Article
Affiliation : Pittsburg State University 
Montanuniversitӓt Leoben 
University of Surrey 
Cyprus University of Technology 
University of Cyprus 
University of Louisville 
University of Kansas 
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