Enhanced electrochemical activity of carbon felt for V2+/V3+ redox reaction via combining KOH-etched pretreatment with uniform deposition of Bi nanoparticles

Lv, Yang; Zhang, Jin; Lv, Zhaoqian; Wu, Chunxiao; Liu, Yiyang; Wang, Haining; Lu, Shanfu; Xiang, Yan

doi:10.1016/j.electacta.2017.09.005

Cited by 53 publications

(34 citation statements)

References 26 publications

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“…At 2 wt.% the effect was at its maximum with an energy efficiency of 79% at j = 160 mA·cm −2 for over 300 cycles. Carbon felt has been etched with KOH first before deposition of bismuth nanoparticles for use as a negative VRFB electrode [400]. The etching caused additional micropores and oxygen-containing surface group subsequently promoting bismuth deposition.…”

Section: Foreign Metal Depositsmentioning

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: Foreign Metal Depositsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…For this reason, several catalysts have been proposed and studied to enhance the V(II)/V(III) redox reaction [19]. Among others, such as Ce [20], Ti [21,22], Nd [23], Sb [24], Nb [25] and W [26], Bi is considered a promising catalyst [27][28][29][30][31][32][33]. Besides low cost and toxicity it shows an enhancing effect on the kinetics of the negative half-cell reaction, while effectively suppressing the HER.…”

Section: Introductionmentioning

confidence: 99%

“…Besides low cost and toxicity it shows an enhancing effect on the kinetics of the negative half-cell reaction, while effectively suppressing the HER. Remarkably, this is the case no matter if the bismuth is used as an electrolyte additive [27], deposited onto the electrode [28,29,[31][32][33] or integrated into the carbon fibers via an electrospinning process [30]. Also, the choice of metallic or oxidic particles is of minor importance, since inside the potential window of the negative half-cell, bismuth should be present as Bi 0 [33].…”

Section: Introductionmentioning

confidence: 99%

Degradation Phenomena of Bismuth-Modified Felt Electrodes in VRFB Studied by Electrochemical Impedance Spectroscopy

et al. 2019

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The performance of all-V redox flow batteries (VRFB) will decrease when they are exposed to dynamic electrochemical cycling, but also when they are in prolonged contact with the acidic electrolyte. These phenomena are especially severe at the negative side, where the parasitic hydrogen evolution reaction (HER) will be increasingly favored over the reduction of V(III) with ongoing degradation of the carbon felt electrode. Bismuth, either added to the electrolyte or deposited onto the felt, has been reported to suppress the HER and therefore to enhance the kinetics of the V(II)/V(III) redox reaction. This study is the first to investigate degradation effects on bismuth-modified electrodes in the negative half-cell of a VRFB. By means of a simple impregnation method, a commercially available carbon felt was decorated with Bi 2 O 3 , which is supposedly present as Bi(0) under the working conditions at the negative side. Modified and unmodified felts were characterized electrochemically using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in a three-electrode setup. Surface morphology of the electrodes and composition of the negative half-cell electrolyte were probed using scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy (TXRF), respectively. This was done before and after the electrodes were subjected to 50 charge-discharge cycles in a battery test bench. Our results suggest that not only the bismuth catalyst is dissolved from the electrode during battery operation, but also that the presence of bismuth in the system has a strong accelerating effect on electrode degradation.

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“…In VRFB system, V 2+ /V 3+ reaction attests a severer voltage loss, resulting from the fact that heterogeneous electrons transfer at a slower rate compared with VO 2+ /VO 2 + reaction . In recent years, titanium‐based compounds (such as TiC, TiN, TiO 2 ) have showed superb electrocatalytic properties for negative couple of VRFB, on which researchers have increasingly focused.…”

Section: Introductionmentioning

confidence: 99%

“…12,15 In VRFB system, V 2+ /V 3+ reaction attests a severer voltage loss, resulting from the fact that heterogeneous electrons transfer at a slower rate compared with VO 2+ / VO 2 + reaction. 16 In recent years, titanium-based com-…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic performance of TiO ₂ with different phase state towards V ²⁺ /V ³⁺ reaction for vanadium redox flow battery

Cheng

et al. 2019

Int J Energy Res

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Summary In this paper, titanium dioxide (TiO2) nanoparticles were employed as catalysts towards V2+/V3+ redox couple of vanadium redox flow battery (VRFB). The effect of TiO2 phase on the electrocatalytic performance for negative couple was systematically investigated. The electrochemical properties of TiO2 with different phase were assessed via cyclic voltammetry and electrochemical impedance spectroscopy by using AB as conductive agent. Obtained from the results, anatase TiO2 (α‐TiO2) exhibits superior electrocatalytic activity to rutile TiO2 (γ‐TiO2). The VRFB cell performs well at discharge capacity, voltage efficiency, and energy efficiency by employing α‐TiO2‐modified negative electrode with current density varying between 50 and 100 mA cm−2. The discharge capacity of α‐TiO2‐modified cell with vanadium ion concentration of 1.6 M comes up to 113.5 mA h at 100 mA cm−2 current density, which is increased by 39.1 mA h after modification for negative electrode. Moreover, the corresponding energy efficiency increases by 7.5% after modification of α‐TiO2. Experimental results show that TiO2 is an ideal catalyst for VRFB. Moreover, α‐TiO2 demonstrates superior electrocatalytic performance to γ‐TiO2 towards V2+/V3+ reaction.

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Enhanced electrochemical activity of carbon felt for V2+/V3+ redox reaction via combining KOH-etched pretreatment with uniform deposition of Bi nanoparticles

Cited by 53 publications

References 26 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Degradation Phenomena of Bismuth-Modified Felt Electrodes in VRFB Studied by Electrochemical Impedance Spectroscopy

Electrocatalytic performance of TiO ₂ with different phase state towards V ²⁺ /V ³⁺ reaction for vanadium redox flow battery

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Enhanced electrochemical activity of carbon felt for V2+/V3+ redox reaction via combining KOH-etched pretreatment with uniform deposition of Bi nanoparticles

Cited by 53 publications

References 26 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Degradation Phenomena of Bismuth-Modified Felt Electrodes in VRFB Studied by Electrochemical Impedance Spectroscopy

Electrocatalytic performance of TiO 2 with different phase state towards V 2+ /V 3+ reaction for vanadium redox flow battery

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Electrocatalytic performance of TiO ₂ with different phase state towards V ²⁺ /V ³⁺ reaction for vanadium redox flow battery