scholarly journals A three-dimensional conducting network of rGO-in-graphite-felt as electrode for vanadium redox flow batteries

2018 ◽  
Vol 4 (1) ◽  
pp. 60-65
Author(s):  
Hongrui Wang ◽  
Wei Ling ◽  
Jizhong Chen ◽  
Zhian Wang ◽  
Xian-Xiang Zeng ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Three Dimensional ◽  
Rate Capability ◽  
Step Method ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
First Results ◽  
Electrochemical Charge Transfer ◽  
Vanadium Redox

AbstractGraphite felt (GF) with numerous merits has been widely used as electrode in all-vanadium redox flow batteries (VRFB), but its further application is still hindered by its intrinsically poor electrocatalytic activity. Herein, we propose a three-dimensional (3D) conducting network constructed with reduced graphene oxide (rGO) in the GF electrode via a two-step method. The 3D conducting network with abundant oxygen-containing functional groups in the GF is conducive to the transport of electrons between GF fibers and the electrochemical charge transfer to vanadium ions in the composite electrode; it can enhance the electrocatalytic activity and conductivity of GF. The VRFB using 3D rGO modified GF (mGF) electrode exhibited outstanding energy efficiency of 73.4% at a current density of 100 mA·cm−2, which is much higher than that with pristine GF (pGF) (65.4%); and better rate capability. These first results reveal that GF with 3D conducting network shows promising opportunities for the VRFB and other electrochemical flow systems

Phosphorus and oxygen co-doped composite electrode with hierarchical electronic and ionic mixed conducting networks for vanadium redox flow batteries

2019 ◽  
Vol 55 (77) ◽  
pp. 11515-11518 ◽  
Author(s):  
Wei Ling ◽  
Zhi-An Wang ◽  
Qiang Ma ◽  
Qi Deng ◽  
Jian-Feng Tang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electrocatalytic Activity ◽  
Composite Electrode ◽  
Rate Capability ◽  
Ion Conduction ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Conducting Networks ◽  
Vanadium Redox ◽  
Co Doped

The GF-TCN electrodes with excellent electrocatalytic activity and faster electron/ion conduction indicate outstanding rate capability and energy efficiency of VRFBs.

scholarly journals Enabling high rate capability, low internal resistance, and excellent cyclability for vanadium redox flow batteries utilizing ultrafast laser-structured graphite felt

2020 ◽  
Vol 344 ◽  
pp. 136171 ◽  
Author(s):  
Michael C. Daugherty ◽  
Chien-Te Hsieh ◽  
Doug S. Aaron ◽  
Yasser Ashraf Gandomi ◽  
Jianlin Li ◽  
...  
Keyword(s):  
Rate Capability ◽  
Internal Resistance ◽  
Ultrafast Laser ◽  
High Rate ◽  
High Rate Capability ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals Towards Production of a Highly Catalytic and Stable Graphene-Wrapped Graphite Felt Electrode for Vanadium Redox Flow Batteries

Batteries ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 63 ◽  
Author(s):  
Seyedabolfazl Mousavihashemi ◽  
Sebastián Murcia-López ◽  
Mir Hosseini ◽  
Joan Morante ◽  
Cristina Flox
Keyword(s):  
Electron Transfer ◽  
Active Sites ◽  
Electrochemical Impedance ◽  
Rate Capability ◽  
Layer By Layer ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox ◽  
Positive Half

Despite the appealing features of vanadium redox flow batteries as a promising energy storage solution, the polarization losses, among other factors, prevent widespread applications. The dominant contribution to these polarization losses is the sluggish (even irreversible) electron-transfer towards reactions, leading to large over-potentials (poor rate capability). In particular, the positive half-cell reaction suffers from a complex mechanism since electron- and oxygen-transfer processes are key steps towards efficient kinetics. Thus, the positive reaction calls for electrodes with a large number of active sites, faster electron transfer, and excellent electrical properties. To face this issue, a graphene-wrapped graphite felt (GO-GF) electrode was synthesized by an electrospray process as a cost-effective and straightforward way, leading to a firm control of the GO-deposited layer-by-layer. The voltage value was optimized to produce a homogeneous deposition over a GF electrode after achieving a stable Taylor cone-jet. The GO-GF electrode was investigated by cyclic voltammetry and electrochemical impedance spectroscopy in order to elucidate the electrocatalytic properties. Both analyses reflect this excellent improvement by reducing the over-potentials, improving reversibility, and enhancing collected current density. These findings confirm that the GO-GF is a promising electrode for high-performance VRFB, overcoming the performance-limiting issues in a positive half-reaction.

Electrocatalytic activity of nitrogen-doped CNT graphite felt hybrid for all-vanadium redox flow batteries

2018 ◽  
Vol 43 (3) ◽  
pp. 1516-1522 ◽  
Author(s):  
Dae-Soo Yang ◽  
Jang Yong Lee ◽  
Sang-Woo Jo ◽  
Sang Jun Yoon ◽  
Tae-Ho Kim ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Graphite Felt ◽  
Nitrogen Doped ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Three-dimensional annealed WO3 nanowire/graphene foam as an electrocatalytic material for all vanadium redox flow batteries

2017 ◽  
Vol 1 (10) ◽  
pp. 2091-2100 ◽  
Author(s):  
Daniel Manaye Kabtamu ◽  
Yu-Chung Chang ◽  
Guan-Yi Lin ◽  
Anteneh Wodaje Bayeh ◽  
Jian-Yu Chen ◽  
...  
Keyword(s):  
Graphene Sheet ◽  
Tungsten Trioxide ◽  
Low Cost ◽  
Three Dimensional ◽  
Graphene Foam ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

This paper presents a three-dimensional annealed tungsten trioxide nanowire/graphene sheet (3D annealed WO3 NWs/GS) foam as an excellent and low-cost electrocatalyst.

Highly efficient and ultra-stable boron-doped graphite felt electrodes for vanadium redox flow batteries

2018 ◽  
Vol 6 (27) ◽  
pp. 13244-13253 ◽  
Author(s):  
H. R. Jiang ◽  
W. Shyy ◽  
L. Zeng ◽  
R. H. Zhang ◽  
T. S. Zhao
Keyword(s):  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Highly Efficient ◽  
Boron Doped ◽  
Flow Batteries ◽  
Vanadium Redox ◽  
Felt Electrodes

Highly efficient and ultra-stable boron-doped graphite felt electrodes are designed, fabricated and tested for vanadium redox flow batteries.

scholarly journals 3D flower-like molybdenum disulfide modified graphite felt as a positive material for vanadium redox flow batteries

RSC Advances ◽  
2020 ◽  
Vol 10 (29) ◽  
pp. 17235-17246
Author(s):  
Lei Wang ◽  
Shuangyu Li ◽  
Dan Li ◽  
Qinhao Xiao ◽  
Wenheng Jing
Keyword(s):  
Ion Transport ◽  
Molybdenum Disulfide ◽  
Open Flower ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Positive Material ◽  
Flow Batteries ◽  
Vanadium Redox ◽  
Vanadium Ion

The open flower-like structure facilitates vanadium ion transport. The capacity and efficiency of a battery using MoS2/GF are dramatically increased.

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