Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent
We investigate the pseudocapacitive properties of ferrimagnetic NiFe2O4 ceramics in a 0.5 M Na2SO4 aqueous electrolyte. These ceramics have a high capacitance of 2.33 Fcm−2 since a more efficient colloidal technique is applied, which enhances the current response of the electrode in the negative po...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-06-01
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| Series: | Open Ceramics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666539521000730 |
| _version_ | 1818443750627606528 |
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| author | Mohamed Nawwar Rakesh P. Sahu Ishwar K. Puri Igor Zhitomirsky |
| author_facet | Mohamed Nawwar Rakesh P. Sahu Ishwar K. Puri Igor Zhitomirsky |
| author_sort | Mohamed Nawwar |
| collection | DOAJ |
| description | We investigate the pseudocapacitive properties of ferrimagnetic NiFe2O4 ceramics in a 0.5 M Na2SO4 aqueous electrolyte. These ceramics have a high capacitance of 2.33 Fcm−2 since a more efficient colloidal technique is applied, which enhances the current response of the electrode in the negative potential range. NiFe2O4 is co-dispersed with multiwalled carbon nanotubes (MWCNTs) using Celestine Blue (CB) dye as a multifunctional co-dispersant. The capacitance measurements are performed by cyclic voltammetry, impedance spectroscopy and galvanostatic charge-discharge. The experiments reveal the synergistic effects of NiFe2O4 and conductive MWCNTs additives and the benefit they provide through co-dispersion with CB, which acts as an electron transfer mediator, enhancing pseudocapacitance. The mass ratio of NiFe2O4 and MWCNTs in the composite electrodes is varied to optimize the capacitance enhancement, lower electrical resistance at a high active mass loading of 40 mg cm−2, and achieve favorable capacitance retention at high charge-discharge rates. The results reveal a path for the development of pseudocapacitive ferrimagnetic ceramic composites that have advanced functionality. |
| first_indexed | 2024-12-14T19:05:00Z |
| format | Article |
| id | doaj.art-0db8295c00b044d6b6d8a458ec936ded |
| institution | Directory Open Access Journal |
| issn | 2666-5395 |
| language | English |
| last_indexed | 2024-12-14T19:05:00Z |
| publishDate | 2021-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Open Ceramics |
| spelling | doaj.art-0db8295c00b044d6b6d8a458ec936ded2022-12-21T22:50:53ZengElsevierOpen Ceramics2666-53952021-06-016100127Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agentMohamed Nawwar0Rakesh P. Sahu1Ishwar K. Puri2Igor Zhitomirsky3Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, CanadaDepartment of Materials Science and Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada; Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, CanadaDepartment of Materials Science and Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada; Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, CanadaDepartment of Materials Science and Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada; Corresponding author.We investigate the pseudocapacitive properties of ferrimagnetic NiFe2O4 ceramics in a 0.5 M Na2SO4 aqueous electrolyte. These ceramics have a high capacitance of 2.33 Fcm−2 since a more efficient colloidal technique is applied, which enhances the current response of the electrode in the negative potential range. NiFe2O4 is co-dispersed with multiwalled carbon nanotubes (MWCNTs) using Celestine Blue (CB) dye as a multifunctional co-dispersant. The capacitance measurements are performed by cyclic voltammetry, impedance spectroscopy and galvanostatic charge-discharge. The experiments reveal the synergistic effects of NiFe2O4 and conductive MWCNTs additives and the benefit they provide through co-dispersion with CB, which acts as an electron transfer mediator, enhancing pseudocapacitance. The mass ratio of NiFe2O4 and MWCNTs in the composite electrodes is varied to optimize the capacitance enhancement, lower electrical resistance at a high active mass loading of 40 mg cm−2, and achieve favorable capacitance retention at high charge-discharge rates. The results reveal a path for the development of pseudocapacitive ferrimagnetic ceramic composites that have advanced functionality.http://www.sciencedirect.com/science/article/pii/S2666539521000730PseudocapacitanceFerrimagnetismSpinelDispersantCharge transferDye |
| spellingShingle | Mohamed Nawwar Rakesh P. Sahu Ishwar K. Puri Igor Zhitomirsky Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent Open Ceramics Pseudocapacitance Ferrimagnetism Spinel Dispersant Charge transfer Dye |
| title | Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| title_full | Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| title_fullStr | Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| title_full_unstemmed | Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| title_short | Pseudocapacitive behavior of ferrimagnetic NiFe2O4-carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| title_sort | pseudocapacitive behavior of ferrimagnetic nife2o4 carbon nanotube electrodes prepared with a multifunctional dispersing agent |
| topic | Pseudocapacitance Ferrimagnetism Spinel Dispersant Charge transfer Dye |
| url | http://www.sciencedirect.com/science/article/pii/S2666539521000730 |
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