Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media
Co-precipitation method was adopted in the preparation of nickel–cobalt oxides for potential application in supercapacitors. The formation of spinel nickel–cobalt oxide, NiCo2O4 started below 400 °C as confirmed by X-ray diffraction analysis. Pure phase nickel cobaltite with cation ratio of 1:2 (Ni:...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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John Wiley & Sons
2015
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| Online Access: | http://psasir.upm.edu.my/id/eprint/42215/ http://psasir.upm.edu.my/id/eprint/42215/1/Synthesis%20and%20electrochemical%20properties%20of%20nanostructured%20nickel%E2%80%93cobalt%20oxides%20as%20supercapacitor%20electrodes%20in%20aqueous%20media.pdf |
| _version_ | 1848849905069588480 |
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| author | Chang, Sook Keng Zainal, Zulkarnain Tan, Kar Ban Yusof, Nor Azah Wan Yusoff, Wan Mohamad Daud Prabaharan, Savari R. S. |
| author_facet | Chang, Sook Keng Zainal, Zulkarnain Tan, Kar Ban Yusof, Nor Azah Wan Yusoff, Wan Mohamad Daud Prabaharan, Savari R. S. |
| author_sort | Chang, Sook Keng |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Co-precipitation method was adopted in the preparation of nickel–cobalt oxides for potential application in supercapacitors. The formation of spinel nickel–cobalt oxide, NiCo2O4 started below 400 °C as confirmed by X-ray diffraction analysis. Pure phase nickel cobaltite with cation ratio of 1:2 (Ni:Co) was obtained at calcination temperature of 400 °C. The spinel phase decomposed gradually until 700 °C. The calcination time for the formation of NiCo2O4 was found to be between 2 to 4 h. The particle size of the prepared sample studied by transmission electron microscopy showed a value of 9.47 nm. The electrochemical properties of the metal oxide were measured in various acidic, neutral and alkaline electrolyte systems (1.0 M HCl, 1.0 M KCl and 1.0 M KOH) by employment of cyclic voltammetry, galvanostatic charge–discharge test and electrochemical impedance spectroscopy. Ideal capacitor behaviour with the largest operating voltage of 1.0 V and good electrochemical stability were observed in NiCo2O4 using neutral KCl aqueous electrolyte. Meanwhile, the prepared sample displayed the highest surface redox activity in 1.0 M KOH alkaline electrolyte but showed the lowest electrochemical performance in acidic electrolyte. At the current density of 0.5 A g−1, 1.0 M HCl, 1.0 M KCl and 1.0 M KOH gave specific capacitance values of 3.8, 41.9 and 249.8 F g−1 respectively. |
| first_indexed | 2025-11-15T09:57:49Z |
| format | Article |
| id | upm-42215 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T09:57:49Z |
| publishDate | 2015 |
| publisher | John Wiley & Sons |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-422152016-04-12T04:42:16Z http://psasir.upm.edu.my/id/eprint/42215/ Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media Chang, Sook Keng Zainal, Zulkarnain Tan, Kar Ban Yusof, Nor Azah Wan Yusoff, Wan Mohamad Daud Prabaharan, Savari R. S. Co-precipitation method was adopted in the preparation of nickel–cobalt oxides for potential application in supercapacitors. The formation of spinel nickel–cobalt oxide, NiCo2O4 started below 400 °C as confirmed by X-ray diffraction analysis. Pure phase nickel cobaltite with cation ratio of 1:2 (Ni:Co) was obtained at calcination temperature of 400 °C. The spinel phase decomposed gradually until 700 °C. The calcination time for the formation of NiCo2O4 was found to be between 2 to 4 h. The particle size of the prepared sample studied by transmission electron microscopy showed a value of 9.47 nm. The electrochemical properties of the metal oxide were measured in various acidic, neutral and alkaline electrolyte systems (1.0 M HCl, 1.0 M KCl and 1.0 M KOH) by employment of cyclic voltammetry, galvanostatic charge–discharge test and electrochemical impedance spectroscopy. Ideal capacitor behaviour with the largest operating voltage of 1.0 V and good electrochemical stability were observed in NiCo2O4 using neutral KCl aqueous electrolyte. Meanwhile, the prepared sample displayed the highest surface redox activity in 1.0 M KOH alkaline electrolyte but showed the lowest electrochemical performance in acidic electrolyte. At the current density of 0.5 A g−1, 1.0 M HCl, 1.0 M KCl and 1.0 M KOH gave specific capacitance values of 3.8, 41.9 and 249.8 F g−1 respectively. John Wiley & Sons 2015-08 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/42215/1/Synthesis%20and%20electrochemical%20properties%20of%20nanostructured%20nickel%E2%80%93cobalt%20oxides%20as%20supercapacitor%20electrodes%20in%20aqueous%20media.pdf Chang, Sook Keng and Zainal, Zulkarnain and Tan, Kar Ban and Yusof, Nor Azah and Wan Yusoff, Wan Mohamad Daud and Prabaharan, Savari R. S. (2015) Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media. International Journal of Energy Research, 39 (10). pp. 1366-1377. ISSN 0363-907X; ESSN: 1099-114X http://onlinelibrary.wiley.com/wol1/doi/10.1002/er.3339/abstract 10.1002/er.3339 |
| spellingShingle | Chang, Sook Keng Zainal, Zulkarnain Tan, Kar Ban Yusof, Nor Azah Wan Yusoff, Wan Mohamad Daud Prabaharan, Savari R. S. Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title | Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title_full | Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title_fullStr | Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title_full_unstemmed | Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title_short | Synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| title_sort | synthesis and electrochemical properties of nanostructured nickel–cobalt oxides as supercapacitor electrodes in aqueous media |
| url | http://psasir.upm.edu.my/id/eprint/42215/ http://psasir.upm.edu.my/id/eprint/42215/ http://psasir.upm.edu.my/id/eprint/42215/ http://psasir.upm.edu.my/id/eprint/42215/1/Synthesis%20and%20electrochemical%20properties%20of%20nanostructured%20nickel%E2%80%93cobalt%20oxides%20as%20supercapacitor%20electrodes%20in%20aqueous%20media.pdf |