Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode
The supercapacitive properties of synthesized nickel phthalocyanine multiwalled carbon nanotubes nanocomposite on a glassy carbon electrode (NiPcMWCNTs-GCE) in four different electrolytes were investigated. The successful synthesis of the NiPcMWCNTs nanocomposite was confirmed by UV/vis electrode sp...
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MDPI AG
2022-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/11/1876 |
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| author | Sheriff A. Balogun Omolola E. Fayemi |
| author_facet | Sheriff A. Balogun Omolola E. Fayemi |
| author_sort | Sheriff A. Balogun |
| collection | DOAJ |
| description | The supercapacitive properties of synthesized nickel phthalocyanine multiwalled carbon nanotubes nanocomposite on a glassy carbon electrode (NiPcMWCNTs-GCE) in four different electrolytes were investigated. The successful synthesis of the NiPcMWCNTs nanocomposite was confirmed by UV/vis electrode spectroscopy, SEM, TEM, EDX, and XRD techniques. The supercapacitive behaviors of the modified electrodes were examined in PBS, H<sub>2</sub>SO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub>, and SAB electrolytes via CV and EIS techniques. The highest specific capacitance of 6.80 F g<sup>−1</sup> was achieved for the GCE-NiPcMWCNTs electrode in 5 mM [Fe(CN)<sub>6</sub>]<sup>4−/3−</sup> prepared in 0.1 M PBS (pH 7). Charge transfer resistance R<sub>ct</sub> values of 0.06, 0.36, 0.61, and 1.98 kΩ were obtained for the GCE-NiPcMWCNTs in H<sub>2</sub>SO<sub>4</sub>, SAB, Na<sub>2</sub>SO<sub>4</sub>, and PBS electrolytes, respectively. Power density values, otherwise known as the “knee” frequency f°, of 21.2, 6.87, 2.22, and 1.68 Hz were also obtained for GCE-NiPcMWCNTs in H<sub>2</sub>SO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub>, PBS, and SAB electrolytes, respectively. GCE-NiPcMWCNTs demonstrated the fastest electron transport capability and the highest power density in H<sub>2</sub>SO<sub>4</sub> compared to the other electrolytes. Hence, GCE-NiPcMWCNTs-modified electrodes had high stability, high energy and power densities, and a large specific capacitance. |
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| last_indexed | 2024-03-10T01:01:26Z |
| publishDate | 2022-05-01 |
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| series | Nanomaterials |
| spelling | doaj.art-4da0339fbb2a4f20ba164fd0b93e7d492023-11-23T14:33:41ZengMDPI AGNanomaterials2079-49912022-05-011211187610.3390/nano12111876Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon ElectrodeSheriff A. Balogun0Omolola E. Fayemi1Department of Chemistry, Faculty of Natural and Agricultural Sciences, Mafikeng Campus, North-West University, Private Bag X2046, Mmabatho 2735, South AfricaDepartment of Chemistry, Faculty of Natural and Agricultural Sciences, Mafikeng Campus, North-West University, Private Bag X2046, Mmabatho 2735, South AfricaThe supercapacitive properties of synthesized nickel phthalocyanine multiwalled carbon nanotubes nanocomposite on a glassy carbon electrode (NiPcMWCNTs-GCE) in four different electrolytes were investigated. The successful synthesis of the NiPcMWCNTs nanocomposite was confirmed by UV/vis electrode spectroscopy, SEM, TEM, EDX, and XRD techniques. The supercapacitive behaviors of the modified electrodes were examined in PBS, H<sub>2</sub>SO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub>, and SAB electrolytes via CV and EIS techniques. The highest specific capacitance of 6.80 F g<sup>−1</sup> was achieved for the GCE-NiPcMWCNTs electrode in 5 mM [Fe(CN)<sub>6</sub>]<sup>4−/3−</sup> prepared in 0.1 M PBS (pH 7). Charge transfer resistance R<sub>ct</sub> values of 0.06, 0.36, 0.61, and 1.98 kΩ were obtained for the GCE-NiPcMWCNTs in H<sub>2</sub>SO<sub>4</sub>, SAB, Na<sub>2</sub>SO<sub>4</sub>, and PBS electrolytes, respectively. Power density values, otherwise known as the “knee” frequency f°, of 21.2, 6.87, 2.22, and 1.68 Hz were also obtained for GCE-NiPcMWCNTs in H<sub>2</sub>SO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub>, PBS, and SAB electrolytes, respectively. GCE-NiPcMWCNTs demonstrated the fastest electron transport capability and the highest power density in H<sub>2</sub>SO<sub>4</sub> compared to the other electrolytes. Hence, GCE-NiPcMWCNTs-modified electrodes had high stability, high energy and power densities, and a large specific capacitance.https://www.mdpi.com/2079-4991/12/11/1876supercapacitornickel phthalocyaninemultiwalled carbon nanotubesbromateelectrochemical impedance spectroscopy |
| spellingShingle | Sheriff A. Balogun Omolola E. Fayemi Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode Nanomaterials supercapacitor nickel phthalocyanine multiwalled carbon nanotubes bromate electrochemical impedance spectroscopy |
| title | Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode |
| title_full | Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode |
| title_fullStr | Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode |
| title_full_unstemmed | Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode |
| title_short | Effects of Electrolytes on the Electrochemical Impedance Properties of NiPcMWCNTs-Modified Glassy Carbon Electrode |
| title_sort | effects of electrolytes on the electrochemical impedance properties of nipcmwcnts modified glassy carbon electrode |
| topic | supercapacitor nickel phthalocyanine multiwalled carbon nanotubes bromate electrochemical impedance spectroscopy |
| url | https://www.mdpi.com/2079-4991/12/11/1876 |
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