The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple
Carbon nanotubes (CNTs) have been applied as catalysts in the VO 2 + /VO 2+ redox, whereas the mechanism of CNTs for the redox reaction is still unclear. In this work, the mechanism of the VO 2 + /VO 2+ redox is investigated by comparing the electrocatalytic performance of CNTs with different distri...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
R S C Publications
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/67658 |
| _version_ | 1848761624320540672 |
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| author | Lv, Z. Zhang, J. Lv, Y. Cheng, Y. Jiang, San Ping Xiang, Y. Lu, S. |
| author_facet | Lv, Z. Zhang, J. Lv, Y. Cheng, Y. Jiang, San Ping Xiang, Y. Lu, S. |
| author_sort | Lv, Z. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Carbon nanotubes (CNTs) have been applied as catalysts in the VO 2 + /VO 2+ redox, whereas the mechanism of CNTs for the redox reaction is still unclear. In this work, the mechanism of the VO 2 + /VO 2+ redox is investigated by comparing the electrocatalytic performance of CNTs with different distributions. For different CNTs, the peak current density of the VO 2 + /VO 2+ redox increases with increasing content of oxygen-functional groups on the surface of CNTs, especially the carboxyl group which is proved as active sites for the redox reaction. Moreover, the reversibility of the VO 2 + /VO 2+ redox decreases with increasing defects of CNTs, as the defects affect the charge transfer of the catalytic reaction. Nevertheless, when a multi-walled CNT sample is oxidized to achieve a high content of oxygen functional groups and defects, the peak current density of the redox reaction increases from 38.5 mA mg -1 to 45.4 mA mg -1 whilst the peak potential separation (ΔE p ) also increases from 0.176 V to 0.209 V. Overall, a balance between the oxygen functional groups and the defects of CNTs affects the peak current and the reversibility for the VO 2 + /VO 2+ redox. |
| first_indexed | 2025-11-14T10:34:38Z |
| format | Journal Article |
| id | curtin-20.500.11937-67658 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:34:38Z |
| publishDate | 2018 |
| publisher | R S C Publications |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-676582018-09-26T06:09:14Z The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple Lv, Z. Zhang, J. Lv, Y. Cheng, Y. Jiang, San Ping Xiang, Y. Lu, S. Carbon nanotubes (CNTs) have been applied as catalysts in the VO 2 + /VO 2+ redox, whereas the mechanism of CNTs for the redox reaction is still unclear. In this work, the mechanism of the VO 2 + /VO 2+ redox is investigated by comparing the electrocatalytic performance of CNTs with different distributions. For different CNTs, the peak current density of the VO 2 + /VO 2+ redox increases with increasing content of oxygen-functional groups on the surface of CNTs, especially the carboxyl group which is proved as active sites for the redox reaction. Moreover, the reversibility of the VO 2 + /VO 2+ redox decreases with increasing defects of CNTs, as the defects affect the charge transfer of the catalytic reaction. Nevertheless, when a multi-walled CNT sample is oxidized to achieve a high content of oxygen functional groups and defects, the peak current density of the redox reaction increases from 38.5 mA mg -1 to 45.4 mA mg -1 whilst the peak potential separation (ΔE p ) also increases from 0.176 V to 0.209 V. Overall, a balance between the oxygen functional groups and the defects of CNTs affects the peak current and the reversibility for the VO 2 + /VO 2+ redox. 2018 Journal Article http://hdl.handle.net/20.500.11937/67658 10.1039/c7cp08683k R S C Publications restricted |
| spellingShingle | Lv, Z. Zhang, J. Lv, Y. Cheng, Y. Jiang, San Ping Xiang, Y. Lu, S. The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title | The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title_full | The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title_fullStr | The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title_full_unstemmed | The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title_short | The electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the VO2+/VO2+ redox couple |
| title_sort | electrocatalytic characterization and mechanism of carbon nanotubes with different numbers of walls for the vo2+/vo2+ redox couple |
| url | http://hdl.handle.net/20.500.11937/67658 |