Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite.
This research is based on the modification of a glassy carbon electrode with cobalt (II) tetra carboxy phthalocyanine and nitrogen doped graphene oxide nanosheets composite (CoTCPc/N GONS) was used for the electrocatalytic oxidation of nitrites. The synthesised cobalt (II) tetra carboxy phthalocyani...
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| Language: | English |
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Midlands State University
2017
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| Online Access: | http://hdl.handle.net/11408/2280 |
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| _version_ | 1779905669158141952 |
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| author | Ndhlovu, Terrence T. |
| author_facet | Ndhlovu, Terrence T. |
| author_sort | Ndhlovu, Terrence T. |
| collection | DSpace |
| description | This research is based on the modification of a glassy carbon electrode with cobalt (II) tetra carboxy phthalocyanine and nitrogen doped graphene oxide nanosheets composite (CoTCPc/N GONS) was used for the electrocatalytic oxidation of nitrites. The synthesised cobalt (II) tetra carboxy phthalocyanine (CoTCPc) and nitrogen doped graphene oxide nanosheets (N-GONS) were characterized by FTIR spectroscopy, UV-Vis spectroscopy, electrochemical impedance and cyclic voltammetry. The electrode surface area for CoTCPc/N-GONS-GCE was 0.174 cm2, which was at least twice that of a BGCE indicating that the modified electrode provided larger surface area for electro catalysis. The modified electrode had a surface coverage of 1.22. The CoTCPc/N-GONS-GCE had kapp and RCT values of 3.64 and 145.47 Ω respectively. The electrochemical detection of the nitrite with CoTCPc/N-GONS GCE was successful producing high peak currents compared to other electrodes. The electrocatalytic oxidation of nitrite was determined to be a 1st order reaction and with a Tafel slope of 270 mV/decade. Limit of detection (LOD) was M and Limit of quantification (LOQ) was M. The electrode showed good reproducibility with lower oxidation potential at 0.86 V and high sensitivity towards nitrite. |
| id | ir-11408-2280 |
| institution | My University |
| language | English |
| publishDate | 2017 |
| publisher | Midlands State University |
| record_format | dspace |
| spelling | ir-11408-22802022-06-27T13:49:05Z Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. Ndhlovu, Terrence T. Electrocatalytic oxidation Chemical technology This research is based on the modification of a glassy carbon electrode with cobalt (II) tetra carboxy phthalocyanine and nitrogen doped graphene oxide nanosheets composite (CoTCPc/N GONS) was used for the electrocatalytic oxidation of nitrites. The synthesised cobalt (II) tetra carboxy phthalocyanine (CoTCPc) and nitrogen doped graphene oxide nanosheets (N-GONS) were characterized by FTIR spectroscopy, UV-Vis spectroscopy, electrochemical impedance and cyclic voltammetry. The electrode surface area for CoTCPc/N-GONS-GCE was 0.174 cm2, which was at least twice that of a BGCE indicating that the modified electrode provided larger surface area for electro catalysis. The modified electrode had a surface coverage of 1.22. The CoTCPc/N-GONS-GCE had kapp and RCT values of 3.64 and 145.47 Ω respectively. The electrochemical detection of the nitrite with CoTCPc/N-GONS GCE was successful producing high peak currents compared to other electrodes. The electrocatalytic oxidation of nitrite was determined to be a 1st order reaction and with a Tafel slope of 270 mV/decade. Limit of detection (LOD) was M and Limit of quantification (LOQ) was M. The electrode showed good reproducibility with lower oxidation potential at 0.86 V and high sensitivity towards nitrite. 2017-06-29T06:41:15Z 2017-06-29T06:41:15Z 2016-06 http://hdl.handle.net/11408/2280 en open Midlands State University |
| spellingShingle | Electrocatalytic oxidation Chemical technology Ndhlovu, Terrence T. Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title | Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title_full | Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title_fullStr | Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title_full_unstemmed | Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title_short | Electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| title_sort | electrocatalytic oxidation of nitrites on glassy carbon electrode modified with cobalt (ii) tetra-carboxy phthalocyanine/ nitrogen doped graphene oxide nanosheets composite. |
| topic | Electrocatalytic oxidation Chemical technology |
| url | http://hdl.handle.net/11408/2280 |
| work_keys_str_mv | AT ndhlovuterrencet electrocatalyticoxidationofnitritesonglassycarbonelectrodemodifiedwithcobaltiitetracarboxyphthalocyaninenitrogendopedgrapheneoxidenanosheetscomposite |