Role of reduced graphene oxide as nano-electrocatalyst in carbon felt electrode of vanadium redox flow battery

Moghim, Mohammad Hadi; Eqra, Rahim; Babaiee, Mohsen; Zarei‐Jelyani, Mohammad; Loghavi, M.

doi:10.1016/j.jelechem.2017.02.031

Cited by 45 publications

(27 citation statements)

References 38 publications

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“…Reaction mechanisms were proposed for both reactions (see Figure 4) based on an earlier suggestion [246]. Moghim et al modified carbon felt with reduced graphene oxide (rGO) by a simple deposition from a solution of the rGO [175]. Depending on the concentration of rGO in the deposition solution and thus presumably the more or less significant loading of the carbon felt with rGO, beyond a significant increase of current, the decrease in oxidation overpotential is remarkable, whereas the peak assigned to the reduction shows a much smaller shift.…”

Section: Structural Modification Of Carbonmentioning

confidence: 99%

Electrocatalysis at Electrodes for VanadiumRedox 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 VanadiumRedox Flow Batteries

Holze

2018

Batteries

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“…[1][2][3][4] Redox flow batteries (RFBs) hold particular promise for long-duration energy storage applications due to their independent power and energy scaling, modular design, and long service life. [5][6] The current state-of-the-art system is the vanadium redox flow battery (VRFB) which utilizes four stable and soluble oxidation states of vanadium dissolved in an aqueous acidic electrolyte, specifically V(II)/V(III) and V(IV)/V(V) as the negative and positive redox couples, respectively. [7][8][9][10][11] The use of the same parent compound greatly simplifies system maintenance, as capacity lost due to species crossover through semi-permeable membranes can be recovered through periodic electrolyte rebalancing events.…”

Section: Introductionmentioning

confidence: 99%

“…To this end, the deposition of electrocatalytic particles into the porous electrodes presents an opportunity for performance improvement and, potentially, cost reduction. [6] Of the numerous candidates, graphene materials have drawn particular attention because of their high specific surface area, high electrical conductivity, chemomechanical stability, and electrochemical activity. [39] Despite the unique favorable properties offered by graphene, typical synthesis routes for high quality (i.e., monolayer) graphene via mechanical cleavage of highly oriented pyrolytic graphite, epitaxial growth on silicon carbide, or chemical vapor deposition are limited by throughput and/or cost, thus complicating production at scale.…”

Section: Introductionmentioning

confidence: 99%

Exploration of reduced graphene oxide microparticles as electrocatalytic materials in vanadium redox flow batteries

Alazmi

Wan

Costa

et al. 2021

Preprint

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Augmenting reaction rates on porous carbon electrodes is critical for reducing the cost of all-vanadium redox flow batteries (VRFBs). To this end, reduced graphene oxide (rGO) based carbons hold promise, demonstrating high specific surface area, chemomechanical stability, and electrochemical activity. While initial efforts have shown that rGOs can enhance VRFB performance, the range of unique processing conditions leads to a collection of materials with disparate elemental composition and porous structure, thus obscuring performance-determining characteristics behind redox reactions and frustrating the development of generalizable design principles. Here, we generate rGO electrocatalysts of nearly identical chemical composition but different textures (i.e., surface area and pore structure) by varying the drying step in the graphene synthesis (i.e., vacuum-drying vs. carbon dioxide critical point drying). We apply spectroscopic and electrochemical techniques on the synthesized rGOs, observing a three-fold increase in BET surface area using critical point drying. We subsequently decorate carbon felt electrodes – both pristine and thermally activated – with rGO microparticles via a flow deposition procedure, and evaluate their performance and durability in a VRFB cell. The synthesis approach and findings described in this work inform and complement efforts to advance the material science and engineering of rGO electrocatalysts.

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“…To improve the electrochemical activity of these carbon-based materials, considerable efforts have been made to modify the materials, such as functional group modication, [2][3][4] optimization of the microstructure, 5,6 increased active area, [7][8][9] and catalyst loading. 10,11 Graphene [12][13][14][15][16] has attracted the attention of many researchers due to its high specic surface area, electrical conductivity and stability. In early 2011, Han et al 17 used graphene oxide (GO) nanosheets directly as electrodes for vanadium batteries, and the batteries exhibits less polarization; and higher conductivity and catalytic performance.…”

Section: Introductionmentioning

confidence: 99%