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MoO2–graphene nanocomposite as an electrocatalyst for high-performance vanadium redox flow battery

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dc.contributor.advisor
dc.contributor.author Bayeh, Anteneh Wodaje
dc.contributor.author Ou, Yang-Yi
dc.contributor.author Ou, Yun-Ting
dc.contributor.author Chang, Yu-Chung
dc.contributor.author Chen, Hsueh-Yu
dc.contributor.author Wang, Kai-Chin
dc.contributor.author Wang, Yao-Ming
dc.contributor.author ; Huang, Hsin-Chih
dc.contributor.author Chiang, Tai-Chin
dc.contributor.author Kabtamu, Daniel Manaye
dc.date.accessioned 2021-07-23T13:31:32Z
dc.date.available 2021-07-23T13:31:32Z
dc.date.issued 2021-08
dc.identifier.citation Anteneh Wodaje Bayeh, Yang-Yi Ou, Yun-Ting Ou, Yu-Chung Chang, Hsueh-Yu Chen, Kai-Chin Wang, Yao-Ming Wang, Hsin-Chih Huang, Tai-Chin Chiang, Daniel Manaye Kabtamu, Chen-Hao Wang, MoO2–graphene nanocomposite as an electrocatalyst for high-performance vanadium redox flow battery, Journal of Energy Storage, Volume 40, 2021, 102795, ISSN 2352-152X, https://doi.org/10.1016/j.est.2021.102795. (https://www.sciencedirect.com/science/article/pii/S2352152X21005223) Abstract: MoO2–reduced graphene oxide composite (MoO2–rGO) acts as the electrode material for all-vanadium redox flow battery (VRFB). MoO2–rGO composite exhibits excellent electrocatalytic redox reversibility for V3+/V2+ and VO2+/VO2+ and larger anodic and cathodic peak currents than those of other individual MoO2 and rGO samples. The voltage efficiency of the VRFB using MoO2–rGO nanocomposite at 80 mA cm−2 is 82.14%, which is 4.23% and 13.56% higher than the VRFBs using the rGO-coated graphite felt electrode and the graphite felt electrode, respectively. It still shows the voltage efficiencies of 73.83% and 68.50% at 120 mA cm−2 and 140 mA cm−2, respectively, but other samples have no effective discharge. This improvement is attributed to the uniform distribution of MoO2 nanoparticles on the rGO surface, avoiding the restacking of the rGO sheets and suppressing nanoparticle aggregation, which might increase the effective surface area and improve mass transport at the electrode-electrolyte interface. Furthermore, oxygen vacancies on MoO2, the high electrical conductivity of rGO, and the high content of oxygen functional groups act as active sites for the vanadium ion redox reaction. Keywords: Vanadium redox flow battery; MoO2; reduced graphene oxide; MoO2–rGO nanocomposite en_US
dc.description.abstract MoO2–reduced graphene oxide composite (MoO2–rGO) acts as the electrode material for all vanadium redox flow battery (VRFB). MoO2–rGO composite exhibits excellent electrocatalytic redox reversibility for V3+/V2+ and VO2+/VO2+ and larger anodic and cathodic peak currents than those of other individual MoO2 and rGO samples. The voltage efficiency of the VRFB using MoO2–rGO nanocomposite at 80 mA cm−2 is 82.14%, which is 4.23% and 13.56% higher than the VRFBs using the rGO-coated graphite felt electrode and the graphite felt electrode, respectively. It still shows the voltage efficiencies of 73.83% and 68.50% at 120 mA cm−2 and 140 mA cm−2 , respectively, but other samples have no effective discharge. This improvement is attributed to the uniform distribution of MoO2 nanoparticles on the rGO surface, avoiding the restacking of the rGO sheets and suppressing nanoparticle aggregation, which might increase the effective surface area and improve mass transport at the electrode-electrolyte interface. Furthermore, oxygen vacancies on MoO2, the high electrical conductivity of rGO, and the high content of oxygen functional groups act as active sites for the vanadium ion redox reaction. en_US
dc.description.uri https://doi.org/10.1016/j.est.2021.102795
dc.publisher ELSELVIER en_US
dc.source.uri https://www.sciencedirect.com/science/article/pii/S2352152X21005223
dc.subject Vanadium redox flow batteryMoO2 reduced graphene oxide MoO2–rGO nanocomposite en_US
dc.title MoO2–graphene nanocomposite as an electrocatalyst for high-performance vanadium redox flow battery en_US
dc.type Article en_US


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