Capacitive performance of graphene-based asymmetric supercapacitor
A two-electrode asymmetric supercapacitor with positive and negative electrodes was developed. The positive electrode was composed of reduced graphene oxide/zinc oxide/cobalt oxide nanostructures (RZCo) that were prepared using a one-pot hydrothermal process. Meanwhile, polypyrrole/reduced graphene...
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| Format: | Article |
| Language: | English |
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Elsevier
2017
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| Online Access: | http://psasir.upm.edu.my/id/eprint/61040/ http://psasir.upm.edu.my/id/eprint/61040/1/Capacitive%20performance%20of%20graphene-based%20asymmetric%20supercapacitor.pdf |
| _version_ | 1848854325065940992 |
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| author | Ng, C. H. Lim, Hong Ngee S., Hayase Zainal, Zulkarnain Shafie, Suhaidi Huang, N. M. |
| author_facet | Ng, C. H. Lim, Hong Ngee S., Hayase Zainal, Zulkarnain Shafie, Suhaidi Huang, N. M. |
| author_sort | Ng, C. H. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A two-electrode asymmetric supercapacitor with positive and negative electrodes was developed. The positive electrode was composed of reduced graphene oxide/zinc oxide/cobalt oxide nanostructures (RZCo) that were prepared using a one-pot hydrothermal process. Meanwhile, polypyrrole/reduced graphene oxide (PyR) was electrodeposited on a graphite sheet as the negative electrode. These electrodes were separated by a 1.0 M Na2SO4 filter membrane. The synergistic effect between the positive and negative electrode materials widened the potential window to 1.6 V, thus contributing a high energy density of 41.8 Wh/kg at 2 mV/s, which was better than that of the KEMET commercial supercapacitor (17.7 Wh/kg). At room temperature (30 °C), the RZCo//PyR asymmetric supercapacitor exhibited a retention of 87% after 800 cycles compared to a retention of only 49% at 0 °C. Although the asymmetric supercapacitor retained 86% of its original capacitance at 60 °C, it possessed a lower specific capacitance than the asymmetric supercapacitor measured at room temperature. The RZCo//PyR asymmetric supercapacitor had a larger specific capacitance and smaller IR drop (0.09 V) than the KEMET commercial supercapacitor, which has a huge IR drop (0.22 V), providing a specific capacitance of 77.7 F/g. |
| first_indexed | 2025-11-15T11:08:04Z |
| format | Article |
| id | upm-61040 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T11:08:04Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-610402019-05-03T01:54:25Z http://psasir.upm.edu.my/id/eprint/61040/ Capacitive performance of graphene-based asymmetric supercapacitor Ng, C. H. Lim, Hong Ngee S., Hayase Zainal, Zulkarnain Shafie, Suhaidi Huang, N. M. A two-electrode asymmetric supercapacitor with positive and negative electrodes was developed. The positive electrode was composed of reduced graphene oxide/zinc oxide/cobalt oxide nanostructures (RZCo) that were prepared using a one-pot hydrothermal process. Meanwhile, polypyrrole/reduced graphene oxide (PyR) was electrodeposited on a graphite sheet as the negative electrode. These electrodes were separated by a 1.0 M Na2SO4 filter membrane. The synergistic effect between the positive and negative electrode materials widened the potential window to 1.6 V, thus contributing a high energy density of 41.8 Wh/kg at 2 mV/s, which was better than that of the KEMET commercial supercapacitor (17.7 Wh/kg). At room temperature (30 °C), the RZCo//PyR asymmetric supercapacitor exhibited a retention of 87% after 800 cycles compared to a retention of only 49% at 0 °C. Although the asymmetric supercapacitor retained 86% of its original capacitance at 60 °C, it possessed a lower specific capacitance than the asymmetric supercapacitor measured at room temperature. The RZCo//PyR asymmetric supercapacitor had a larger specific capacitance and smaller IR drop (0.09 V) than the KEMET commercial supercapacitor, which has a huge IR drop (0.22 V), providing a specific capacitance of 77.7 F/g. Elsevier 2017 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/61040/1/Capacitive%20performance%20of%20graphene-based%20asymmetric%20supercapacitor.pdf Ng, C. H. and Lim, Hong Ngee and S., Hayase and Zainal, Zulkarnain and Shafie, Suhaidi and Huang, N. M. (2017) Capacitive performance of graphene-based asymmetric supercapacitor. Electrochimica Acta, 229. pp. 173-182. ISSN 0013-4686; ESSN: 1873-3859 https://reader.elsevier.com/reader/sd/pii/S0013468617301779?token=A74B0790ADAEB98581C225FE09F03FDCB6126481838D0CDDBEDEB504F271EA4484796A43835EBA93BF3CA5FFED8A4B20 10.1016/j.electacta.2017.01.139 |
| spellingShingle | Ng, C. H. Lim, Hong Ngee S., Hayase Zainal, Zulkarnain Shafie, Suhaidi Huang, N. M. Capacitive performance of graphene-based asymmetric supercapacitor |
| title | Capacitive performance of graphene-based asymmetric supercapacitor |
| title_full | Capacitive performance of graphene-based asymmetric supercapacitor |
| title_fullStr | Capacitive performance of graphene-based asymmetric supercapacitor |
| title_full_unstemmed | Capacitive performance of graphene-based asymmetric supercapacitor |
| title_short | Capacitive performance of graphene-based asymmetric supercapacitor |
| title_sort | capacitive performance of graphene-based asymmetric supercapacitor |
| url | http://psasir.upm.edu.my/id/eprint/61040/ http://psasir.upm.edu.my/id/eprint/61040/ http://psasir.upm.edu.my/id/eprint/61040/ http://psasir.upm.edu.my/id/eprint/61040/1/Capacitive%20performance%20of%20graphene-based%20asymmetric%20supercapacitor.pdf |