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 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

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.

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.

Highly Energy-Efficient Vanadium Redox Flow Batteries with Thermo-Chemically Activated Graphite Felt Electrodes

2020 ◽  
Vol MA2020-02 (2) ◽  
pp. 208-208
Author(s):  
Vladimir Neburchilov ◽  
Ken Tsay ◽  
Khalid Fatih ◽  
Roberto Neagu ◽  
Oltion Kodra ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox ◽  
Felt Electrodes
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