Treated carbon felt as electrode material in vanadium redox flow batteries: a study of the use of carbon nanotubes as electrocatalyst

Zarei‐Jelyani, Mohammad; Rashid-Nadimi, Sahar; Asghari, Saeed

doi:10.1007/s10008-016-3336-y

Cited by 54 publications

(29 citation statements)

References 22 publications

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“…5b) the trend for the influence of oxidation/reduction of the electrode material, be it electrochemically, chemically or thermally, is uniform throughout the listed studies. This is not the case for the VO 2+ /VO 2 + redox reaction: Two studies assign faster kinetics to oxidized samples 35,78 , while two studies conclude that reduced samples show larger values for k 0…”

Section: Electron Transfer Kinetics Of the Vanadium Redox Reactions -mentioning

confidence: 99%

Determining Electron Transfer Kinetics at Porous Electrodes

Friedl

Stimming

2017

Electrochimica Acta

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Newcastle University ePrints -eprint.ncl.ac.uk Friedl J, Stimming U. Determining Electron Transfer Kinetics at Porous Electrodes. Electrochimica Acta 2017, 227, 235-245.Abstract:Porous carbon materials are of tremendous importance for electrochemical energy storage. Their low cost, wide potential window and high surface area make them ideal electrodes for many applications.The activity of the electrode towards a certain reaction is given by both the available wetted surface area and the electron transfer constant k 0 . The present study investigates which electrochemical methods are suitable to determine k 0 on porous carbon electrodes. For this purpose, we investigate the ferric/ferrous redox couple on a porous carbon nanotube electrode as model system. We show that results from cyclic voltammetry (CV) can yield an apparent catalytic effect and elucidate its origin.Chronoamperometry and electrochemical impedance spectroscopy are shown to produce consistent values for the exchange current density I 0 , which can then be normalized to k 0 . Limitations of both

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Section: Electron Transfer Kinetics Of the Vanadium Redox Reactions -mentioning

confidence: 99%

Determining Electron Transfer Kinetics at Porous Electrodes

Friedl

Stimming

2017

Electrochimica Acta

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“…The rate constants of charge transfer, k 0 , of Eq. 1a and 1b vary by orders of magnitude for different authors . Even the influence of surface treatment can have opposite effects on the reaction rate.…”

Section: The Kinetics Of V(ii)/v(iii) and V(iv)/v(v) In The Literaturementioning

confidence: 98%

“…As pointed out above, the fact that the vanadium redox system, Eq. 1, is technically important in the VRFB led to numerous investigations, specifically on possible catalytic effects of the carbon surface on the reaction rate

true normalV^{3 +} + normale^{-} - \to normalV^{2 +}

true VO_{2}^{+} + 2 normalH^{+} + normale^{-} - \to VO^{2 +} + normalH_{2} normalO

…”

Section: The Kinetics Of V(ii)/v(iii) and V(iv)/v(v) In The Literaturementioning

confidence: 99%

“…1, is technically important in the VRFB led to numerous investigations, specifically on possible catalytic effects of the carbon surface on the reaction rate. [3][4][5][6][7][8][9][10] V 3þ þ e À À ! V 2þ (1a)…”

Section: The Kinetics Of V(ii)/v(iii) and V(iv)/v(v) In The Literaturementioning

confidence: 99%

“…1a and 1b vary by orders of magnitude for different authors. [3][4][5][6][7][8][9][10] Even the influence of surface treatment can have opposite effects on the reaction rate. These results are shown in Figure 1.…”

Section: The Kinetics Of V(ii)/v(iii) and V(iv)/v(v) In The Literaturementioning

confidence: 99%

See 2 more Smart Citations

The Vanadium Redox Reactions – Electrocatalysis versus Non‐Electrocatalysis

2019

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Catalytic effects of surface groups on porous carbon electrodes are claimed in literature for the redox reactions V(II)/V(III) and V(IV)/V(V). The literature is critically analysed also in relation to work of this group. A method how to overcome the problem of assessing the electrochemically active surface area on porous electrodes is presented. Applying this method, no catalytic effects for above reactions can be substantiated. It is further pointed out that the parameters electrochemical potential and temperature need to be used to assess electrocatalysis.

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Determination of Rate Constants and Reaction Orders of Vanadium‐Ion Kinetics on Carbon Fiber Electrodes.

2020

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In the present work, the kinetic behavior of vanadiumion reactions on novel single carbon-fiber electrodes is investigated. The theory of reaction orders and charge-transfer coefficients is reviewed and typical sources of error due to incorrectly determined electrochemically active surface area, inhomogeneous current density distributions, mass transfer resistances, and aging are highlighted. The measured rate constants are in a range of 2.5 • 10 À 7-1.1 • 10 À 5 s À 1 for the positive and 7.0 • 10 À 8-2.6 • 10 À 6 s À 1 for the negative electrolyte. Despite these different activities of individual fibers, the reaction orders of V 2 + , V 3 + , VO 2 + and VO 2 + species are precisely determined as a function of the concentration and the state of charge. Moreover, charge-transfer coefficients are calculated with two different approaches based on Tafel slopes and through adjustment of the Butler-Volmer equation.

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Treated carbon felt as electrode material in vanadium redox flow batteries: a study of the use of carbon nanotubes as electrocatalyst

Cited by 54 publications

References 22 publications

Determining Electron Transfer Kinetics at Porous Electrodes

Determining Electron Transfer Kinetics at Porous Electrodes

The Vanadium Redox Reactions – Electrocatalysis versus Non‐Electrocatalysis

Determination of Rate Constants and Reaction Orders of Vanadium‐Ion Kinetics on Carbon Fiber Electrodes.

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