Phosphonated graphene oxide with high electrocatalytic performance for vanadium redox flow battery

Etesami, Mohammad; Abouzari‐Lotf, Ebrahim; Ripin, Adnan; Nasef, Mohamed Mahmoud; Ting, Teo Ming; Saharkhiz, Azam; Ahmad, Arshad

doi:10.1016/j.ijhydene.2017.11.050

Cited by 53 publications

(36 citation statements)

References 35 publications

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“…Further studies of the positive electrode V 4+/5+ reaction showed significant decreases of electrode overpotential, smaller peak separation and increased peak current most pronounced for samples treated at 1000 • C. This material had shown the finest structure suggesting a large surface area (no BET or EASA data were provided) and smooth ion transport. To enhance wettability graphene oxide deposited on carbon felt was covalently functionalized with phosphonic acid groups [252]. CVs recorded for both VRFB cell reactions showed slightly diminished overpotentials but highly asymmetric currents.…”

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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“…The VRB systems are composed of three main components as electrode, electrolyte, and membrane. The electrodes are not only responsible for redox reactions of vanadium couples in the electrolyte media but also control the ion/mass transport into the porous host, which dominantly influence VRBs performance 10 . Thus, improving the electrode performance has been taken great attention by researcher.…”

Section: Introductionmentioning

confidence: 99%

A green approach to fabricate binder‐free S‐doped graphene oxide electrodes for vanadium redox battery

et al. 2020

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Summary Graphene‐based electrodes have great potential for using as positive electrode material of vanadium redox flow batteries. However, production of heteroatom doped graphene oxide in classical methods had many steps and time‐consuming procedure. In this work, binder‐free sulfur‐doped graphene oxide electrodes (S‐GOEs) were obtained from graphite by the chronoamperometric method in eco‐friendly media (sulphuric acid/water) and one step at room temperature. The effects of functional groups ratio on the positive electrolyte performance of vanadium redox battery was investigated via electrochemical methods such as cyclic voltammetry (CV), chrono charge‐discharge, and electrochemical impedance spectroscopy (EIS). Microscopic methods were also used for investigation of the surface morphology of the modified electrodes. Detailed chemical composition of modified electrodes surfaces was investigated by X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR‐ATR) spectroscopy and energy‐dispersive X‐ray spectroscopy (EDS) techniques. CSOxC(x = 2, 3), CSO, hydroxyl, carboxyl and epoxy groups were formed on the modified electrodes during the preparation of graphene oxide based electrodes from the graphite. According to cyclic voltammetry analysis, the electrodes prepared over 3 minutes by chronoamperometric method at 1.9 V (S‐GOE3) showed the best performance as a positive electrode of the vanadium redox battery. The cyclic charge‐discharge test demonstrated that the discharge capacity considerably increased from 171.9 mA h to 179 mA h at 3.2 mA cm−2 discharge current density. Energy efficiency of cell was also climbing by 5% in S‐GOE3 as positive electrode to bare electrode.

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“…Regarding metal catalysts [e.g., Cu (Wei et al, 2016), Ir (Wang et al, 2007) and Sb (Kou et al, 2020)], Zhou et al (2020) used semi-embedded carbon felt with bismuth nanospheres, which had good catalytic activity and could effectively promote the redox reaction of the negative electrode. For metal oxides [e.g., Nd 2 O 3 (Fetyan et al, 2018), MnO 2 (Ma et al, 2018), and PbO 2 (Wu et al, 2014)], Bayeh et al (2020) (Etesami et al, 2018)], Park et al (2013) demonstrated that carbon nanofiber/nanotube composite catalysts had good electrocatalytic performance in VRFB. Compared with the untreated electrode, the discharge capacity of the modified electrode increased by 64% at 40 mA cm −2 .…”

Section: Introductionmentioning

confidence: 99%

“…Regarding carbon-based materials [e.g., carbon nanosheets (He Z. et al, 2020 ), carbon nanofibers (Jiang et al, 2020 ), and graphene (Etesami et al, 2018 )], Park et al ( 2013 ) demonstrated that carbon nanofiber/nanotube composite catalysts had good electrocatalytic performance in VRFB. Compared with the untreated electrode, the discharge capacity of the modified electrode increased by 64% at 40 mA cm −2 .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Catalysis of SnO2-CNTs Composite for VO2+/VO2+ and V2+/V3+ Redox Reactions

et al. 2021

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In this study, a SnO2-carbon nanotube (SnO2-CNT) composite as a catalyst for vanadium redox flow battery (VRFB) was prepared using a sol-gel method. The effects of this composite on the electrochemical performance of VO2+/VO2+, and on the V2+/V3+ redox reactions and VRFB performance were investigated. The SnO2-CNT composite has better catalytic activity than pure SnO2 and CNT due to the synergistic catalysis of SnO2 and the CNT. SnO2 mainly provides the catalytic active sites and the CNTs mainly provide the three-dimensional structure and high electrical conductivity. Therefore, the SnO2-CNT composite has a larger specific surface area and an excellent synergistic catalytic performance. For cell performance, it was found that the SnO2-CNT cell shows a greater discharge capacity and energy efficiency. In particular, at 150 mA cm−2, the discharge capacity of the SnO2-CNT cell is 28.6 mAh higher than that of the pristine cell. The energy efficiency of the modified cell (7%) is 7.2% higher than that of the pristine cell (62.8%). This study shows that the SnO2-CNT is an efficient and promising catalyst for VRFB.

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Phosphonated graphene oxide with high electrocatalytic performance for vanadium redox flow battery

Cited by 53 publications

References 35 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

A green approach to fabricate binder‐free S‐doped graphene oxide electrodes for vanadium redox battery

Synergistic Catalysis of SnO2-CNTs Composite for VO2+/VO2+ and V2+/V3+ Redox Reactions

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