Preparation of a porous graphite felt electrode for advance vanadium redox flow batteries

Zhang, Lei; Yue, Junpei; Deng, Qingqing; Ling, Wei; Zhou, Chen; Zeng, Xian‐Xiang; Zhou, Congshan; Wu, Yuping

doi:10.1039/d0ra00666a

Cited by 25 publications

(24 citation statements)

References 24 publications

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“…The total concentration of the V10-EGF hydroxyl and carboxyl groups (52.99%) was higher than that of the TGF (41.25%), indicating the presence of numerous active sites on the V10-EGF electrode surface. These results indicated good agreement with wettability because the oxygen-containing bond concentration on the electrode surface increased, which provided active sites for the VO 2+ /VO2 + redox reaction [8,[12][13][14][15][16][17][18][19][20][21][22][23]. Because of the electrochemical properties of the GF, TGF, and EGFs, cyclic voltammetry was conducted.…”

Section: Resultsmentioning

confidence: 69%

“…However, the poor electrochemical activity and hydrophobic properties of GF electrodes result in low kineticism in the redox reaction. Various GF electrode surface modification strategies, such as etching [12][13][14][15][16][17][18][19][20][21][22][23], functional group grafting [24][25][26][27][28][29][30], and depositing the electrocatalyst on the electrode surface [31][32][33][34][35][36][37][38], improve the performance of GF as an electrode.…”

Section: Introductionmentioning

confidence: 99%

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V2O5-Activated Graphite Felt with Enhanced Activity for Vanadium Redox Flow Battery

Wang

Hung

2021

Catalysts

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In this study, a simple and environment-friendly method of preparing activated graphite felt (GF) for a vanadium redox flow battery (VRFB) by depositing the vanadium precursor on the GF surface and calcining vanadium oxide was explored. The intermediate material, VO2, generated carbon oxidation during the calcination. In contrast to the normal etching method, this method was simple and without a pickling process. On the surface of the activated GF, multiple pores and increased roughness were noted after the calcination temperature and surface area of the activated GF reached 350 °C to 400 °C and 17.11 m2/g, respectively. Additionally, the polarization of the activated GF decreased with resistance to the charge transfer at 0.27 Ω. After a single-cell test at current density of 150 mA/cm2 was performed, the capacity utilization and the capacity retention after 50 cycles reached 70% and 84%, respectively. These results indicated the potential use of activated GF as an VRFB electrode.

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Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

V2O5-Activated Graphite Felt with Enhanced Activity for Vanadium Redox Flow Battery

Wang

Hung

2021

Catalysts

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“…Different from the intrinsically porous structures of carbon materials, the porous (2D or 3D) carbon fiber-based materials, such as CF, GF, carbon paper (CP), and carbon cloth (CC), are constructed by interweaving carbon fibers with a diameter of tens of micrometers and length of several centimeters (Figure 5(a)) [40]. First, the self-supported 3D porous structures with high porosity facilitate the electrolyte flow, meaning smaller concentration and diffusion polarization [37,64]. Second, the excellent mechanical properties, high corrosion resistance, and good conductivity of 3D carbon fiber- 6…”

Section: Porousmentioning

confidence: 99%

Progress and Perspective of the Cathode Materials towards Bromine-Based Flow Batteries

et al. 2022

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Bromine-based flow batteries (Br-FBs) have been one of the most promising energy storage technologies with attracting advantages of low price, wide potential window, and long cycle life, such as zinc-bromine flow battery, hydrogen-bromine flow battery, and sodium polysulfide-bromine flow battery. The research and development of aqueous Br-FBs are very fast and many achievements have been realized. However, Br-FBs suffer from the sluggish kinetics of Br2/Br- redox couple and serious self-discharge caused by the diffusion of bromine, which hinder the further commercialization and industrialization of the aqueous Br-FBs. A series of mitigation strategies have been developed to figure out these challenges, especially the modifications on electrode materials. Electrode, one of the critical components in a Br-FB, provides the reactions sites for redox couples, upon which its properties exert a significant effect on the performance of Br-FBs. Up to now, extensive research has been carried out on electrode modifications to solve the aforementioned notorious issues of Br-FBs, including surface treatment and surface modification. In this review, various electrode materials and relevant modification approaches used for Br-FBs are overviewed and summarized. Moreover, the relevant mechanisms are illustrated deeply, providing comprehensive and available instruction to pursue and develop high-performance cathodes for Br-FBs with high power density and long lifespan.

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“…[1][2][3][4] However, due to the instable and intermittent nature of renewables, energy storage systems are crucial to level out these fluctuations and hence to ensure a constant and reliable power supply. [5][6][7] Vanadium redox flow batteries (VRFBs) are ones of the most promising energy storage systems owing to their merits of safety, long-cycle life, low maintenance cost, and flexible design. [8][9][10] Besides, the distinguishing feature of VRFBs is the independence of power and energy, where the power is related to the electrode area while the energy depends on the volume of the electrolyte tank, making them attractive for large-scale energy storage applications.…”

Section: Introductionmentioning

confidence: 99%

“…It is in urgent need to reduce the carbon emission by shifting from fossil fuels to renewable energy sources, such as wind and solar power [1–4] . However, due to the instable and intermittent nature of renewables, energy storage systems are crucial to level out these fluctuations and hence to ensure a constant and reliable power supply [5–7] . Vanadium redox flow batteries (VRFBs) are ones of the most promising energy storage systems owing to their merits of safety, long‐cycle life, low maintenance cost, and flexible design [8–10] .…”

Section: Introductionmentioning

confidence: 99%

Carbon Felt Decorated with Carbon Derived from Spent Asphalt as a Low‐cost and High‐performance Electrode for Vanadium Redox Flow Batteries

et al. 2022

ChemNanoMat

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Vanadium redox flow batteries (VRFBs) have attracted much attention in the field of energy storage systems owing to their safety, long-cycle life, and feasible scalability. However, the market penetration of VRFBs is still hindered by the poor performance of current carbon-based electrodes. Herein, spent asphalt is employed as an efficient and low-cost precursor to generate carbon decorating carbon felt for VRFB applications. By thermal decomposition treatment, the spent asphalt is converted into highly active pyrolytic carbon and deposited on surfaces of carbon felt. The as-prepared carbon felt with increased active sites and improved hydrophility displays superior performance towards redox reactions of VO 2 + /VO 2 + in terms of better electrochemical reversibility and faster reaction kinetics. Therefore, the VRFB cell with the carbon felt decorated with carbon derived from spent asphalt as cathode shows 85% energy efficiency which is higher than the pristine carbon felt cathode by 9%. Meanwhile, the energy efficiency and voltage efficiency are both stable during the cell cycling. This strategy can raise the value of the spent asphalt and improve the performance of VRFBs with the decorated carbon felt electrode shedding light on their commercial applications for large-scale energy storage.

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Preparation of a porous graphite felt electrode for advance vanadium redox flow batteries

Abstract: A graphite felt electrode with unique porous structure was designed to improve the performance of VRFBs.

Cited by 25 publications

References 24 publications

V2O5-Activated Graphite Felt with Enhanced Activity for Vanadium Redox Flow Battery

V2O5-Activated Graphite Felt with Enhanced Activity for Vanadium Redox Flow Battery

Progress and Perspective of the Cathode Materials towards Bromine-Based Flow Batteries

Carbon Felt Decorated with Carbon Derived from Spent Asphalt as a Low‐cost and High‐performance Electrode for Vanadium Redox Flow Batteries

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