Influence of antimony ions in negative electrolyte on the electrochemical performance of vanadium redox flow batteries

Shen, Junxi; Liu, Suqin; He, Zhen; Shi, Liqiao

doi:10.1016/j.electacta.2014.11.060

Cited by 91 publications

(57 citation statements)

References 41 publications

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“…Energy efficiency was found to be 79.3% at j = 160 mA·cm −2 , 36.2% higher than with a cell having a pristine carbon felt electrode. Antimony was deposited at the negative VRFB electrode from Sb 3+ -ions added to the electrolyte solution [401]. Increase of apparent vanadium ion diffusion coefficients and decrease of R ct were observed.…”

Section: Foreign Metal Depositsmentioning

confidence: 98%

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: Foreign Metal Depositsmentioning

confidence: 98%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…These include improved felt design, [10][11][12][13] compression, [14][15][16] as well as surface modifications, which either increase the surface area, [17][18][19][20][21] or introduce functional groups [22][23][24][25][26][27][28] or supporting catalysts, such as metals 29,30 or metal oxides. [31][32][33] So far, the most practical and common treatment method is a thermal treatment, where the electrode surface is oxidized in an air atmosphere for up to 30 h at 400 • C. [34][35][36] Although most publications are focusing on one carbon felt or paper type and their modification, the precursor was found to influence the catalytic activity of the electrode.…”

mentioning

confidence: 99%

Characterization of Carbon Felt Electrodes for Vanadium Redox Flow Batteries: Impact of Treatment Methods

Eifert

Banerjee

Jusys

et al. 2018

J. Electrochem. Soc.

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In this study, we investigated the influence of thermal treatment, soaking in H 2 SO 4 and electrochemical ageing on commercially available carbon felt materials from SGL carbon. We compared both the influence of the pre-treatment (carbonization or graphitization) and the influence of the precursor (Rayon or PAN). By thermogravimetric analysis coupled with mass spectrometry (TGA-MS) we showed, that after thermal treatment, the thermal stability was lower for carbonized felts compared to graphitized felts and the Rayon based felts were more stable than PAN based ones. Soaking had a stronger impact on the thermal stability of PAN based felts, whereas it was similar to the electrochemical ageing for Rayon based felts. X-ray photoelectron spectroscopy and Raman spectroscopy revealed that thermal treatment reduces the overall surface oxygen content for all felt types and the degree of graphitization doesn't change, but the content of single bonded oxygen was increased for graphitized carbon felts, only. For carbonized felts, thermal treatment highly reduced the electrochemical activity characterized by cyclic voltammetry due to a reduced overall oxygen content and increased C=O and C=C contents. In this work, we provide a comprehensive overview of commercially available carbon felts and characterize the effects of several treatment methods.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.52.96.103 Downloaded on 2018-09-04 to IP A2578 Journal of The Electrochemical Society, 165 (11) A2577-A2586 (2018) ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.52.96.103 Downloaded on 2018-09-04 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.52.96.103 Downloaded on 2018-09-04 to IP

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“…Each plot shows a similar illustration: in the high-frequency region, there is a semicircle and in the low-frequency region, there is a straight line upward. They correspond to the transfer reaction of charge at the interface of electrode/electrolyte and the diffusion of iron species in the electrolyte, respectively, and this result suggests that electrochemical reaction and diffusion steps mix-control the Fe(III)/Fe(II) redox reaction [36]. There is a distance from the crossing of the semicircle's left end and the abscissa to the origin, which is the ohmic resistance of the electrolyte, and the semicircle's diameter is the electrochemical reaction resistance of the electrolyte.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 94%

Effects of Electrolyte Additives on Nonaqueous Redox Flow Batteries

Xu¹,

Yang²,

Su³

2020

Redox

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The widespread utilization of nonaqueous redox flow batteries is hindered by the low performance. Including some kinds of additives in electrolyte is a possible and facile solution. In this chapter, the effects of carbon dioxide gas, EC/DMC, and antimony ions on the electrochemical performance of nonaqueous redox flow batteries are disclosed. The results show that the ohmic resistance of the deep eutectic solvent (DES) electrolyte reduces significantly when adding carbon dioxide gas and EC/DMC, the percentage of reduction increases with the volume percentage of EC/ DMC in electrolyte, and the reaction kinetics almost keeps unchanged for carbon dioxide gas and EC/DMC additives. For the additive of antimony ions, the electrochemical reaction kinetics of active redox couple is enhanced, the diffusion coefficient of active ions also increases, and the charge transfer resistance decreases. The antimony ions electrodeposited on the surface of graphite felt contribute a catalytic effect on the electrochemical reaction so as to improve the performance. However, due to the trade-off between the enhanced kinetics and reduced active surface area, the optimum concentration of antimony ions is found to be 15 mM. In addition, the flow battery assembled with negative electrolyte containing antimony ions exhibits 31.2% higher power density than that of pristine DES electrolyte.

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Influence of antimony ions in negative electrolyte on the electrochemical performance of vanadium redox flow batteries

Cited by 91 publications

References 41 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Characterization of Carbon Felt Electrodes for Vanadium Redox Flow Batteries: Impact of Treatment Methods

Effects of Electrolyte Additives on Nonaqueous Redox Flow Batteries

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