Mesoporous tungsten oxynitride as electrocatalyst for promoting redox reactions of vanadium redox couple and performance of vanadium redox flow battery

Lee, Wonmi; Jo, Changshin; Youk, Sol; Shin, Hun Yong; Lee, Jun Young; Chung, Yongjin; Kwon, Yongchai

doi:10.1016/j.apsusc.2017.07.022

Cited by 74 publications

(36 citation statements)

References 41 publications

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“…Mesoporous tungsten oxynitride has been suggested as catalyst for the positive electrode [466]. Details of the actual electrode were missing in the report.…”

Section: Non-carbon Materials and Miscellaneous Conceptsmentioning

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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“…Mesoporous tungsten oxynitride has been suggested as catalyst for the positive electrode [466]. Details of the actual electrode were missing in the report.…”

Section: Non-carbon Materials and Miscellaneous Conceptsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…The environmental and sustainability issues linked to fossil fuel use have peaked in research activities to promote renewable energy (wind, sun, etc.). 1,2 However, the major problems to the growth of renewable energy are its intermittency and volatility on electric power production. 3 In this concept, large-scale energy storage systems will overcome renewable energy intermittency.…”

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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“…Carbon felt electrodes were modified with electrocatalysts such as iridium, bismuth, tungsten oxynitride, manganese oxide, titanium oxide, copper oxide, and SnO 2 . [121][122][123][124][125][126][127] In addition, thermal, chemical, O 2 plasma, and calcination, modification of metal electrocatalysts were applied to the standard carbon felt electrodes to enhance their electrochemical properties.…”

Section: Metal-based Electrocatalysts Modified On Carbon Feltmentioning

confidence: 99%

A comprehensive review of carbon‐based and metal‐based electrocatalysts in the vanadium redox flow battery

Taş

Elden

2021

Energy Storage

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The vanadium redox flow battery mainly consists of an electrode, membrane, and electrolyte. Positive and negative electrodes have great importance to the battery's performance. Electrodes were treated thermally, acid and plasma and modified with carbon-based and metal-based electrocatalysts to increase their electrochemical activity, active area, stability, and functional groups. In this study, comprehensive research was conducted on carbon-based and metal-based electrocatalysts. Furthermore, modification and treatment methods, chargedischarge potential, maximum capacity, capacity fading, and energy efficiency of the electrode were examined at the same current density. The highest energy efficiency of the carbon-based electrocatalyst was obtained for graphite felt doped with carbon nanoparticles. The energy efficiency of bare graphite felt was 67.4%, the efficiency increased up to 84.8% with the carbon nanoparticle electrocatalyst.Ohmic loss was reduced, and operating voltage window was enlarged. For metal electrocatalysts, the highest energy efficiency was obtained by titanium nitride modification. The energy efficiency increased from 68% to 89% in comparison to the bare electrode. Electrode kinetics and reversibility were improved by electrocatalyst doping, and the active area of the electrode was increased.

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Mesoporous tungsten oxynitride as electrocatalyst for promoting redox reactions of vanadium redox couple and performance of vanadium redox flow battery

Cited by 74 publications

References 41 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

A comprehensive review of carbon‐based and metal‐based electrocatalysts in the vanadium redox flow battery

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