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...

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Main Authors: Skyllas-Kazacos, Maria, Rui, Xianhong, Oo, Moe Ohnmar, Sim, Daohao, Yan, Qingyu, Raghu, Subash Chandrabose, Lim, Tuti Mariana
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/96158
http://hdl.handle.net/10220/10840
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.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.
institution Nanyang Technological University
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country Singapore
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language English
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).
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
format Article
author Skyllas-Kazacos, Maria
Rui, Xianhong
Oo, Moe Ohnmar
Sim, Daohao
Yan, Qingyu
Raghu, Subash Chandrabose
Lim, Tuti Mariana
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
author_sort Skyllas-Kazacos, Maria
title 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_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_sort graphene oxide nanosheets/polymer binders as superior electrocatalytic materials for vanadium bromide redox flow batteries
publishDate 2013
url https://hdl.handle.net/10356/96158
http://hdl.handle.net/10220/10840
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