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Graphite/NiO/Ni Electrode for Electro-oxidation of the Remazol Black 5 Dye

1Department of Chemistry, Universitas Gadjah Mada, Yogyakarta , Indonesia

2Department of Chemistry, Universitas Pendidikan Ganesha, Singaraja, Indonesia

Received: 9 Jul 2021; Revised: 9 Sep 2021; Accepted: 10 Sep 2021; Available online: 12 Sep 2021; Published: 20 Dec 2021.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2021 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Graphite/NiO/Ni electrode had been fabricated for the electro-oxidation of remazol black 5 dye. The electrode was synthesized by electrodeposition method. Electro-oxidation of 100 ppm remazol black 5 dye was carried out at various concentrations of NaCl, 0.025; 0.05; 0.1; 0.25; and 0.5 M, variations in electro-oxidation time were 15, 30, 45, and 60 minutes, and pH variations were 4, 6, and 8. Cyclic voltammetry test revealed that graphite/NiO/Ni electrode had higher electrocatalytic capability compared to graphite electrode. The X-ray diffraction (XRD) patterns showed the decreasing value of 2θ from 44.6° for Ni to 43.5° for NiO. Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX) showed that NiO/Ni deposited on the graphite surface in the form of solid grains and cracks, FTIR showed that δ(Ni−O) bond appeared at 582–511 cm1. The decolorization efficiency of remazol black 5 for graphite/NiO/Ni electrode was 100% for 45 minutes of the electro-oxidation process, while the decolorization efficiency of remazol black 5 for graphite electrode was 99.74% for 60 minutes of the electro-oxidation process. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (


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Keywords: graphite/NiO/Ni; electro-oxidation; Remazol Black 5 dye
Funding: Ministry of Research and Higher Education Republic of Indonesai under contract BPPNDN S3 scholarship

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