Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes
Hierarchical nanostructures of hydrated α-manganese dioxide (MnO2) are prepared and their kinetics properties are characterized using scanning electrochemical microscopy (SECM). The SECM measurements are focused on the feedback mode approach curve to extract the effective heterogeneous charge transf...
| Main Authors: | , , , |
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| 其他作者: | |
| 格式: | Journal Article |
| 语言: | English |
| 出版: |
2013
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| 在线阅读: | https://hdl.handle.net/10356/95949 http://hdl.handle.net/10220/11359 |
| _version_ | 1826121081387220992 |
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| author | Wittstock, Gunther Lee, Pooi See Sumboja, Afriyanti Tefashe, Ushula Mengesha |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Wittstock, Gunther Lee, Pooi See Sumboja, Afriyanti Tefashe, Ushula Mengesha |
| author_sort | Wittstock, Gunther |
| collection | NTU |
| description | Hierarchical nanostructures of hydrated α-manganese dioxide (MnO2) are prepared and their kinetics properties are characterized using scanning electrochemical microscopy (SECM). The SECM measurements are focused on the feedback mode approach curve to extract the effective heterogeneous charge transfer rate constant and illustration of the ultramicroelectrode (UME) tip-substrate cyclic voltammetry. Positive feedback current is observed during the SECM approach curve, indicating the efficient charge transfer process into the MnO2 electrode. These studies complement electrochemical impedance spectroscopy and charge discharge measurements that are carried out to determine the effectiveness of the resultant MnO2 for supercapacitor application. Specific capacitance as high as 356 F g−1 at 2 A g−1 is achieved and there is no degradation of the capacitance after 2000 cycles of cycling test, indicating its good capacitive properties for supercapacitor application. |
| first_indexed | 2024-10-01T05:26:54Z |
| format | Journal Article |
| id | ntu-10356/95949 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:26:54Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/959492020-06-01T10:13:58Z Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes Wittstock, Gunther Lee, Pooi See Sumboja, Afriyanti Tefashe, Ushula Mengesha School of Materials Science & Engineering Hierarchical nanostructures of hydrated α-manganese dioxide (MnO2) are prepared and their kinetics properties are characterized using scanning electrochemical microscopy (SECM). The SECM measurements are focused on the feedback mode approach curve to extract the effective heterogeneous charge transfer rate constant and illustration of the ultramicroelectrode (UME) tip-substrate cyclic voltammetry. Positive feedback current is observed during the SECM approach curve, indicating the efficient charge transfer process into the MnO2 electrode. These studies complement electrochemical impedance spectroscopy and charge discharge measurements that are carried out to determine the effectiveness of the resultant MnO2 for supercapacitor application. Specific capacitance as high as 356 F g−1 at 2 A g−1 is achieved and there is no degradation of the capacitance after 2000 cycles of cycling test, indicating its good capacitive properties for supercapacitor application. 2013-07-15T02:23:13Z 2019-12-06T19:23:38Z 2013-07-15T02:23:13Z 2019-12-06T19:23:38Z 2012 2012 Journal Article Sumboja, A., Tefashe, U. M., Wittstock, G., & Lee, P. S. (2012). Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes. Journal of Power Sources, 207, 205-211. https://hdl.handle.net/10356/95949 http://hdl.handle.net/10220/11359 10.1016/j.jpowsour.2012.01.153 en Journal of power sources © 2012 Elsevier B.V. |
| spellingShingle | Wittstock, Gunther Lee, Pooi See Sumboja, Afriyanti Tefashe, Ushula Mengesha Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title | Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title_full | Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title_fullStr | Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title_full_unstemmed | Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title_short | Monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| title_sort | monitoring electroactive ions at manganese dioxide pseudocapacitive electrodes with scanning electrochemical microscope for supercapacitor electrodes |
| url | https://hdl.handle.net/10356/95949 http://hdl.handle.net/10220/11359 |
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