Holey-engineered electrodes for advanced vanadium flow batteries

Liu, Yuchen; Shen, Yi; Yu, Lihong; Liu, Le; Liang, Feng; Qiu, Xinping; Xi, Jingyu

doi:10.1016/j.nanoen.2017.11.012

Cited by 145 publications

(95 citation statements)

References 55 publications

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“…Holey-engineering [231] was applied to graphite felt by Liu et al to obtain a porous graphite felt material [232]. The obtained product showed enhanced wettability and largely increase surface area resulting in improved performance of both electrodes up to current densities of 300 mA·cm −2 during up to 3000 cycles.…”

Section: Structural Modification Of Carbonmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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Flow batteries (also: redox batteries or redox flow batteries RFB) are briefly introduced as systems for conversion and storage of electrical energy into chemical energy and back. Their place in the wide range of systems and processes for energy conversion and storage is outlined. Acceleration of electrochemical charge transfer for vanadium-based redox systems desired for improved performance efficiency of these systems is reviewed in detail; relevant data pertaining to other redox systems are added when possibly meriting attention. An attempt is made to separate effects simply caused by enlarged electrochemically active surface area and true (specific) electrocatalytic activity. Because this requires proper definition of the experimental setup and careful examination of experimental results, electrochemical methods employed in the reviewed studies are described first.

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Section: Structural Modification Of Carbonmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…One of the core components of the RFB stack is the electrode, which, to a certain extent, governs the overall performance of the RFB as the electrochemical reaction occurs at the electrode surface. In a flow battery, one of the most effective methods to reduce the stack size and the cost is to increase the operating current density, which also increases the power density and energy efficiency . However, increasing the current density increases the voltage loss arising from the polarization that includes electrode kinetics, ohmic resistance, and mass transport limitations, leading to undesirable deterioration in the overall cell performance .…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer and Reaction Kinetic Enhanced Electrode for High‐Performance Aqueous Flow Batteries

Mukhopadhyay

Yang

et al. 2019

Adv Funct Materials

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A scalable and efficient process to modify electrodes with enhanced mass transfer and reaction kinetics is critical for redox flow batteries (RFBs). For the first time, this work introduces electrochemical exfoliation as a surface modification method of graphite felt (GF) to enhance the mass transfer and reaction kinetics in RFBs. Anion intercalation and subsequent gas evolutions at room temperature for one minute expand the graphite layers that increase the electrode surface area. Meanwhile, sufficient oxygen functional groups are introduced to the electrode, resulting in enhanced reaction kinetics and improved hydrophilicity. Further, spin-polarized density functional theory is employed to reveal the role of oxygen functional groups in accelerating the vanadium redox reaction. Benefitting from sufficient oxygen groups, larger surface area, and superior wettability, the as-prepared exfoliated GF (E-GF) shows exceptional electrocatalytic activity with minimized overpotential, higher volumetric capacity, and improved energy efficiency. The redox flow battery assembled with the E-GF electrode delivers voltage and energy efficiencies of 89.72% and 86.41% at the current density of 100 mA cm −2 , respectively. Remarkably, compared to the traditional GF treatment method, the elimination of the high temperature and long-time treatment processes make this approach much more energy and time efficient, scalable, and affordable for large-scale manufacturing.

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“…Increasing the wettability and activity of GF can significantly boost the operation current density of VFB, thereby reducing its unit cost [7] . To date, various strategies, including thermal treatment [8] , acid activation [9] , electro-oxidation [10] , chemical etching [11] , decorating nano electrocatalysts such as carbon materials [12][13][14] and metal oxides [15][16][17][18] , have been successfully employed to improve the wettability and activity of GF. As a result, the charge-discharge current density of VFB increases from the initial 50-150 mA cm −2 to the current 10 0-30 0 mA cm −2 [19] .…”

Section: Introductionmentioning

confidence: 99%

Holey-engineered electrodes for advanced vanadium flow batteries

Cited by 145 publications

References 55 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Mass Transfer and Reaction Kinetic Enhanced Electrode for High‐Performance Aqueous Flow Batteries

P-doped electrode for vanadium flow battery with high-rate capability and all-climate adaptability

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