Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries
Few layered graphene oxide (GO) nanosheets with large specific surface area (42.1 m2 g−1) are successfully prepared by a modified Hummers method for use as electrodes in the vanadium bromide redox battery. The structure and physicochemical properties of GO are investigated by X-ray diffraction, Rama...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96158 http://hdl.handle.net/10220/10840 |
| _version_ | 1826120846172749824 |
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| author | Skyllas-Kazacos, Maria Rui, Xianhong Oo, Moe Ohnmar Sim, Daohao Yan, Qingyu Raghu, Subash Chandrabose Lim, Tuti Mariana |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Skyllas-Kazacos, Maria Rui, Xianhong Oo, Moe Ohnmar Sim, Daohao Yan, Qingyu Raghu, Subash Chandrabose Lim, Tuti Mariana |
| author_sort | Skyllas-Kazacos, Maria |
| collection | NTU |
| description | Few layered graphene oxide (GO) nanosheets with large specific surface area (42.1 m2 g−1) are successfully prepared by a modified Hummers method for use as electrodes in the vanadium bromide redox battery. The structure and physicochemical properties of GO are investigated by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. Cyclic voltammetry results indicate that GO nanosheets with polymer binder (i.e., polyvinylidiene fluoride (PVDF) or sulfonated poly(ether ether ketone) (SPEEK)) hybrids demonstrate more favorable electrocatalytic activity towards the Br−/Br3− and V3+/V2+ redox couples than the pure graphite. This is attributed to the large numbers of oxygen-containing functional groups on the GO nanosheet surface which can generate more active sites to catalyze the redox reactions. For the binder-based electrodes, the SPEEK based electrode gives the best electrochemical performance (e.g., lower overvoltage for both Br−/Br3− and V3+/V2+ redox couple reactions and higher peak currents for the V3+/V2+ redox couple). |
| first_indexed | 2024-10-01T05:23:08Z |
| format | Journal Article |
| id | ntu-10356/96158 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:23:08Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/961582021-01-08T07:40:10Z Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries Skyllas-Kazacos, Maria Rui, Xianhong Oo, Moe Ohnmar Sim, Daohao Yan, Qingyu Raghu, Subash Chandrabose Lim, Tuti Mariana School of Civil and Environmental Engineering School of Materials Science & Engineering Energy Research Institute @ NTU (ERI@N) Few layered graphene oxide (GO) nanosheets with large specific surface area (42.1 m2 g−1) are successfully prepared by a modified Hummers method for use as electrodes in the vanadium bromide redox battery. The structure and physicochemical properties of GO are investigated by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. Cyclic voltammetry results indicate that GO nanosheets with polymer binder (i.e., polyvinylidiene fluoride (PVDF) or sulfonated poly(ether ether ketone) (SPEEK)) hybrids demonstrate more favorable electrocatalytic activity towards the Br−/Br3− and V3+/V2+ redox couples than the pure graphite. This is attributed to the large numbers of oxygen-containing functional groups on the GO nanosheet surface which can generate more active sites to catalyze the redox reactions. For the binder-based electrodes, the SPEEK based electrode gives the best electrochemical performance (e.g., lower overvoltage for both Br−/Br3− and V3+/V2+ redox couple reactions and higher peak currents for the V3+/V2+ redox couple). 2013-07-01T04:17:32Z 2019-12-06T19:26:26Z 2013-07-01T04:17:32Z 2019-12-06T19:26:26Z 2012 2012 Journal Article Rui, X., Oo, M. O., Sim, D., Raghu, S. c., Yan, Q., Lim, T. M., et al. (2012). Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries. Electrochimica acta, 85, 175-181. 0013-4686 https://hdl.handle.net/10356/96158 http://hdl.handle.net/10220/10840 10.1016/j.electacta.2012.08.119 en Electrochimica acta © 2012 Elsevier Ltd. |
| spellingShingle | Skyllas-Kazacos, Maria Rui, Xianhong Oo, Moe Ohnmar Sim, Daohao Yan, Qingyu Raghu, Subash Chandrabose Lim, Tuti Mariana Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title | Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title_full | Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title_fullStr | Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title_full_unstemmed | Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title_short | Graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| title_sort | graphene oxide nanosheets polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries |
| url | https://hdl.handle.net/10356/96158 http://hdl.handle.net/10220/10840 |
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