Balancing the specific surface area and mass diffusion property of electrospun carbon fibers to enhance the cell performance of vanadium redox flow battery

2020 ◽  
Vol 45 (22) ◽  
pp. 12565-12576
Author(s):  
L. Zeng ◽  
J. Sun ◽  
T.S. Zhao ◽  
Y.X. Ren ◽  
L. Wei
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Fibers ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Diffusion Property ◽  
Vanadium Redox

scholarly journals In-Situ Tools Used in Vanadium Redox Flow Battery Research—Review

Batteries ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 53
Author(s):  
Purna C. Ghimire ◽  
Arjun Bhattarai ◽  
Tuti M. Lim ◽  
Nyunt Wai ◽  
Maria Skyllas-Kazacos ◽  
...  
Keyword(s):  
Energy Storage ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
Ex Situ ◽  
Diagnostic Tools ◽  
Research Review ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Vanadium Redox

Progress in renewable energy production has directed interest in advanced developments of energy storage systems. The all-vanadium redox flow battery (VRFB) is one of the attractive technologies for large scale energy storage due to its design versatility and scalability, longevity, good round-trip efficiencies, stable capacity and safety. Despite these advantages, the deployment of the vanadium battery has been limited due to vanadium and cell material costs, as well as supply issues. Improving stack power density can lower the cost per kW power output and therefore, intensive research and development is currently ongoing to improve cell performance by increasing electrode activity, reducing cell resistance, improving membrane selectivity and ionic conductivity, etc. In order to evaluate the cell performance arising from this intensive R&D, numerous physical, electrochemical and chemical techniques are employed, which are mostly carried out ex situ, particularly on cell characterizations. However, this approach is unable to provide in-depth insights into the changes within the cell during operation. Therefore, in situ diagnostic tools have been developed to acquire information relating to the design, operating parameters and cell materials during VRFB operation. This paper reviews in situ diagnostic tools used to realize an in-depth insight into the VRFBs. A systematic review of the previous research in the field is presented with the advantages and limitations of each technique being discussed, along with the recommendations to guide researchers to identify the most appropriate technique for specific investigations.

Preparation and characterization of SPES/PVA (double-layer) membrane for vanadium redox flow battery

2018 ◽  
Vol 31 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Jili Xie ◽  
Guanlin Li ◽  
Wang Tan
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Coulombic Efficiency ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Layer Membrane ◽  
Vanadium Redox ◽  
Vanadium Ions

The double-layer membrane consisting of sulfonated poly(ether sulfone) (SPES) sub-layer and polyvinyl alcohol (PVA) sub-layer (denoted as SPES/PVA membrane) was prepared and employed as the separator for vanadium redox flow battery (VRB) system to evaluate the vanadium ions permeability and cell performance. The SPES/PVA membrane is a double-layer structure and exhibits dramatically lower vanadium ions permeability and better cell performance compared to the pristine SPES membrane, PVA membrane, and Nafion117 membrane. The vanadium ion permeability of SPES/PVA membrane is one order of magnitude lower than that of Nafion117 membrane. In further work, the single cell with SPES/PVA membrane showed significantly lower capacity loss, higher coulombic efficiency (>92.5%), and higher energy efficiency (>83.9%) than Nafion117 membrane. In the self-discharge test, SPES/PVA membrane showed 1.8 times longer duration in the open circuit decay than Nafion117 membrane. With all the good properties and low cost, this new kind of double-layer membrane is suggested to have excellent commercial prospects as an ion exchange membrane for VRB systems.

scholarly journals A Comprehensive Study on Hydroxyl Multiwalled Carbon Nanotubes Used as Catalysts for VO2+/VO2+ Reaction in Vanadium Redox Flow Battery

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Qiang Li ◽  
Anyu Bai ◽  
Zeqiang Qu ◽  
Tianyu Zhang ◽  
Jie Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
High Catalytic Activity ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Multiwalled Carbon ◽  
Vanadium Redox ◽  
Comprehensive Study

A comprehensive study on the hydroxyl multiwalled carbon nanotubes (hydroxyl MWCNTs) as catalysts in a positive reaction was performed to improve the efficiency of the vanadium redox flow battery (VRFB). The physicochemical properties of the hydroxyl MWCNT-modified electrode were characterized by using a scanning electron microscope (SEM), conductivity measurement, Brunner–Emmet–Teller (BET) measurement, X-ray photoelectron spectroscopy (XPS) analysis, cyclic voltammetry (CV) tests, electrochemical impedance spectroscopy (EIS) analysis, and charge-discharge tests. The prepared composite electrode possesses a huge amount of oxygen-containing groups, high-specific surface area, high electrical conductivity, and high catalytic activity towards the VO2+/VO2+ reaction based on physicochemical characterization. The hydroxyl MWCNT-modified graphite felt (hydroxyl MWCNTs/GF) shows the best cell performance with the energy efficiency of 79.74% and remains in high stability after 50 cycles. The improved cell performance is probably ascribed to the increase in active sites, fast charge transfer, and mass transfer rate of the introduced hydroxyl MWCNTs.

scholarly journals High surface area bio-waste based carbon as a superior electrode for vanadium redox flow battery

2017 ◽  
Vol 362 ◽  
pp. 50-56 ◽  
Author(s):  
Makhan Maharjan ◽  
Arjun Bhattarai ◽  
Mani Ulaganathan ◽  
Nyunt Wai ◽  
Moe Ohnmar Oo ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Vanadium Redox

scholarly journals 3D-printed conductive static mixers enable all-vanadium redox ow battery using slurry electrodes

2019 ◽  
Author(s):  
Matthias Wessling
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
State Of The Art ◽  
Graphite Powder ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Static Mixers ◽  
3D Printed ◽  
Vanadium Redox

State-of-the-art all-vanadium redox flow batteries employ porous carbonaceous materials as electrodes. The battery cells possess non-scalable fixed electrodes inserted into a cell stack. In contrast, a conductive particle network dispersed in the electrolyte, known as slurry electrode, may be beneficial for a scalable redox flow battery. In this work, slurry electrodes are successfully introduced to an all-vanadium redox flow battery. Activated carbon and graphite powder particles are dispersed up to 20 wt% in the vanadium electrolyte and charge-discharge behavior is inspected via polarization studies. Graphite powder slurry is superior over activated carbon with a polarization behavior closer to the standard graphite felt electrodes. 3D-printed conductive static mixers introduced to the slurry channel improve the charge transfer via intensified slurry mixing and increased surface area. Consequently, a significant increase in the coulombic efficiency up to 95% and energy efficiency up to 65% is obtained. Our results show that slurry electrodes supported by conductive static mixers can be competitive to state-of-the-art electrodes yielding an additional degree of freedom in battery design. Research into carbon properties (particle size, internal surface area, pore size distribution) tailored to the electrolyte system and optimization of the mixer geometry may yield even better battery properties.

scholarly journals Analysis of the Performance of Phosphorus and Sulphur Co-Doped Reduced Graphene Oxide as Catalyst in Vanadium Redox Flow Battery

2022 ◽  
Author(s):  
Qiang Li ◽  
Junnan Wang ◽  
Tianyu Zhang ◽  
Zinan Wang ◽  
Zhichao Xue ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Specific Surface ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Reduced Graphene ◽  
Vanadium Redox ◽  
Co Doped

Abstract In a vanadium redox flow battery, the traditional polyacrylonitrile based graphite felt (GF) electrode suffers the problems of low electrochemical catalytic activity and low specific surface area. To improve the performance of the GF electrode, we prepared phosphorus and sulphur co-doped reduced graphene oxide (PS-rGO) as catalyst with the simple treatment of reduced graphene oxide (rGO) in the mixture of phytic acid and sulfuric acid. The GF electrode modified with PS-rGO (PS-rGO-GF) was characterized by scanning electron microscope, specific surface area, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge-discharge tests. The PS-rGO-GF shows enhanced performance toward VO2+/VO2+ redox reaction. The battery with the PS-rGO decorated GF presents an excellent battery performance with the energy efficiency of 81.37 % at the current density of 80 mA cm-2 and the corresponding discharge capacity of 772 mAh due to the high catalytic activity of PS-rGO.

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