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Nanoflakes-like nickel cobaltite as active electrode material for 4-nitrophenol reduction and supercapacitor applications

Title
Nanoflakes-like nickel cobaltite as active electrode material for 4-nitrophenol reduction and supercapacitor applications
Authors
Hunge, Yuvaraj M.Yadav, A.A.Kang, Seok-WonKim, HyunminFujishima, AkiraTerashima, Chiaki
DGIST Authors
Hunge, Yuvaraj M.; Yadav, A.A.; Kang, Seok-Won; Kim, Hyunmin; Fujishima, Akira; Terashima, Chiaki
Issue Date
2021-10
Citation
Journal of Hazardous Materials, 419, 126453
Type
Article
Author Keywords
Hydrothermal methodNiCo2O4 nanoflakesCatalytic reduction4-NitrophenolElectrochemical propertiesSupercapacitors
Keywords
HIGH-PERFORMANCE SUPERCAPACITORSUPERIOR CATALYTIC-ACTIVITYP-NITROPHENOLPHOTOCATALYTIC DEGRADATIONFACILE SYNTHESISENERGY-STORAGETHIN-FILM4-NITROPHENOLNANOPARTICLESARRAYS
ISSN
0304-3894
Abstract
Catalytic reduction of nitroaromatic compounds present in wastewater by nanostructured materials is a promising process for wastewater treatment. A multifunctional electrode based on ternary spinal nickel cobalt oxide is used in the catalytic reduction of a nitroaromatic compound and supercapacitor application. In this study, we designed nanoflakes- like nickel cobaltite (NiCo2O4) using a simple, chemical, cost-effective hydrothermal method. Nanoflakes- like NiCo2O4 samples are tested as catalysts toward rapid reduction of 4-nitrophenol and as electrode materials for supercapacitors. The conversion of 4-nitrophenol into 4-aminophenol is achieved using a reducing agents like sodium borohydride and NiCo2O4 catalyst. Effect of catalyst loading, 4-nitrophenol and sodium borohydride concentrations on the catalytic performance of 4-nitrophenol is studied. As sodium borohydride concentration increases the catalytic efficiency of 4-nitrophenol increased due to more BH4- ions available which provides more electrons for catalytic reduction of 4-nitrophenol. Catalytic reduction of 4-nitrophenol using sodium borohydride as a reducing agent was based on the Langmuir–Hinshelwood mechanism. This mechanism follows the apparent pseudo first order reaction kinetics. Additionally, NiCo2O4 electrode is used for energy storage application. The nanoflakes-like NiCo2O4 electrode deposited at 120 °C shows a higher specific capacitance than samples synthesized at 100 and 140 °C. The maximum specific capacitance observed for NiCo2O4 electrode is 1505 Fg−1 at a scan rate of 5 mV s−1 with high stability of 95% for 5000 CV cycles. © 2021 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/13892
DOI
10.1016/j.jhazmat.2021.126453
Publisher
Elsevier B.V.
Related Researcher
  • Author Kim, Hyunmin  
  • Research Interests Nonlinear optics, Femtosecond ultrafast carrier dynamics, Super resolution microscopy, Optical soliton transport, Biological imaging
Files:
There are no files associated with this item.
Collection:
Division of Biotechnology1. Journal Articles


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