Novel acid-base hybrid membrane based on amine-functionalized reduced graphene oxide and sulfonated polyimide for vanadium redox flow battery

Abstract In a vanadium redox flow battery, the traditional polyacrylonitrile based graphite felt (GF) electrode suffers the problems of low electrochemical catalytic activity and low specific surface area. To improve the performance of the GF electrode, we prepared phosphorus and sulphur co-doped reduced graphene oxide (PS-rGO) as catalyst with the simple treatment of reduced graphene oxide (rGO) in the mixture of phytic acid and sulfuric acid. The GF electrode modified with PS-rGO (PS-rGO-GF) was characterized by scanning electron microscope, specific surface area, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge-discharge tests. The PS-rGO-GF shows enhanced performance toward VO2+/VO2+ redox reaction. The battery with the PS-rGO decorated GF presents an excellent battery performance with the energy efficiency of 81.37 % at the current density of 80 mA cm-2 and the corresponding discharge capacity of 772 mAh due to the high catalytic activity of PS-rGO.

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Reduced graphene oxide with tunable C/O ratio and its activity towards vanadium redox pairs for an all vanadium redox flow battery

Carbon ◽

10.1016/j.carbon.2012.12.069 ◽

2013 ◽

Vol 55 ◽

pp. 313-320 ◽

Cited By ~ 114

Author(s):

Wenyue Li ◽

Jianguo Liu ◽

Chuanwei Yan

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Vanadium Redox Flow Battery ◽

Redox Flow Battery ◽

Flow Battery ◽

Reduced Graphene ◽

Vanadium Redox

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Advanced Sulfonated Poly(Ether Ether Ketone)/Graphene-Oxide/Titanium Dioxide Nanoparticle Composited Membrane with Superior Cyclability for Vanadium Redox Flow Battery

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18503 ◽

2020 ◽

Vol 20 (8) ◽

pp. 4714-4721 ◽

Cited By ~ 9

Author(s):

Jiaye Ye ◽

Chun Wu ◽

Wei Qin ◽

Fangfang Zhong ◽

Mei Ding

Keyword(s):

Graphene Oxide ◽

Hybrid Membrane ◽

Vanadium Redox Flow Battery ◽

Redox Flow Battery ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Ether Ketone ◽

Vanadium Redox ◽

Vanadium Ions ◽

Sulfonated Poly

The purpose of this study was to improve the repulsion ability of sulfonated poly(ether ether ketone) (SPEEK) membrane for the vanadium ions crossover. For this purpose graphene oxide (GO) nanosheet and titanium dioxide (TiO2) nanoparticles were employed into the polymer matrix to prepare SPEEK/GO/TiO2 hybrid membrane via solution-casting method for vanadium redox flow battery (VRFB). The morphology, permeability of vanadium ions and device performance of asprepared membrane were investigated and discussed. It was observed that with the barrier block effect by the filler, the VRFB single cell with the optimized SPEEK/GO/TiO2 hybrid membrane exhibited high coulombic efficiency (~99%), excellent energy efficiency (~85%) and vigorous cyclability (~97.2% capacity retention after 100 cycles). Moreover, the VRFB cell with this blend membrane showed lower vanadium ions permeability than Nafion 212 or pure SPEEK membranes. These results demonstrated that the comprehensive properties of hybrid membrane have been remarkably improved comparing to pristine SPEEK which suggested that the hybrid membrane was applicable for VRFB energy storage system.

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