Multiple-dimensioned defect engineering for graphite felt …
The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra-homogeneous multiple-dimensioned defect, including nano-scale etching and atomic-scale N, O co-doping, was used to modify GF by the molten salt system.
ZrO2-Nanoparticle-Modified Graphite Felt ...
To improve the electrochemical performance of graphite felt (GF) electrodes in vanadium flow batteries (VFBs), we synthesize a series of ZrO2-modified GF (ZrO2/GF) electrodes with varying ZrO2 contents via a facile immersion-precipitation approach. It is found that the uniform immobilization of ZrO2 nanoparticles on the GF not only ...
Improvement of Vanadium Redox Flow Battery Efficiency …
Vanadium redox flow batteries (VRFBs) have become increasingly popular for energy storage, owing to their exceptional safety and scalability. However, the electrode material drawbacks still restrict the efficiency of the VRFBs. In this study, we employed atmospheric dielectric barrier discharge (DBD) to modify the commercial carbon felt (CF) electrodes for …
Overview of the factors affecting the performance of vanadium …
Amongst these chemistries, vanadium-based systems (i.e., vanadium redox flow batteries (VRFBs)) are the most popular chemistry, which are utilised given the vanadium''s flexible oxidation states [6]. The advantage of flow batteries over other competitive systems such as lithium arises from the lower cost per kWh due to the utilisation of more abundantly …
Large scale preparation of 20 cm × 20 cm graphene modified carbon felt ...
Vanadium redox flow batteries (VRFBs) are widely applied in energy storage systems (e.g., wind energy, solar energy), while the poor activity of commonly used carbon-based electrode limits their large-scale application. In this study, the graphene modified carbon felt (G/CF) with a large area of 20 cm × 20 cm has been successfully prepared by a chemical …
Stack Design Considerations for Vanadium Redox Flow Battery
The all-vanadium redox flow battery (VRFB) is a promising technology for large-scale renewable and grid energy storage applications due to its merits of having high efficiency, good tolerance for deep discharge and long life in terms of both number of cycles and life span of components (de Leon et al. 2006; Skyllas-Kazacos et al. 2011).The largest battery in the world …
Numerical Simulation of Flow Field Structure of …
The performances of a vanadium redox flow battery with interdigitated flow field, hierarchical interdigitated flow field, and tapered hierarchical interdigitated flow field were evaluated through 3D numerical model.
Electrochemical modification of graphite felt electrode for vanadium ...
To investigate the stability of graphite felt (GF) for all-vanadium redox flow battery (VRB), the electrochemical performance, mass change and morphology of GF were studied by cyclic voltammetry ...
Enhancement of vanadium redox flow battery performance with …
Doping with oxygen and nitrogen in graphite felt (GF) is critical for enhancing the activity of the electrode material in vanadium redox flow batteries (VRFB). In this paper, we present a combined approach that utilizes Fe etching and nitrogen functionalization by means of K2FeO4 and NH3 to modify the surface structure of graphite fibers. The results show that the …
In situ mapping of activity distribution and oxygen …
Here, we report a total internal reflection imaging sensor without background current interference to map local current distribution of the electrode in a vanadium redox flow battery during...
Hydrothermal ammoniated treatment of PAN-graphite felt for vanadium ...
A novel method of hydrothermal ammoniated treatment on the polyacrylonitrile (PAN)-based graphite felt for vanadium redox flow battery was developed. The graphite felt was treated in a Teflon ...
Characterization of carbon felt electrodes for vanadium redox flow ...
Carbon felt electrodes are commonly used as porous electrodes in Vanadium redox flow batteries for large-scale energy storage. The transport properties of these electrodes are an important ...
Binary NiCoO2-modified graphite felt as an advanced positive …
To address the challenges of the poor electrochemical performance of graphite felt electrodes in vanadium redox flow batteries (VRFBs), binary nickel cobalt oxide (NiCoO 2) is developed as a novel candidate for the positive electrode via a facile hydrothermal and calcination approach. The graphite felt modified with NiCoO 2 exhibits excellent electrochemical activity and reversibility …
Multiple‐dimensioned defect engineering for graphite …
Graphite felt is modified by controlling amounts of KClO 3 and NH 4 Cl to obtain the optimum electrochemical catalysis for vanadium redox reactions. The modified graphite felt owns multiple-dimensioned defects, …
Full article: Two-in-one strategy for optimizing …
Among various redox flow batteries (RFBs), all vanadium redox flow batteries (VRFBs) have come close to commercialization in large-scale energy storage systems because of their lower cross-contamination by using the same active …
Regulating the N/B ratio to construct B, N co-doped carbon …
The heteroatom-doped carbon nanotubes hold great promise for improving the properties of carbon felt in vanadium redox flow batteries. However, the structure control and catalytic mechanisms of B, N co-doping are still insufficient. Herein, the precisely controllable B, N co-doped carbon nanotubes (BNCNTs) are constructed on the surface of carbon felt via an in-situ …
Multiple‐dimensioned defect engineering for graphite felt …
The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra-homogeneous multiple-dimensioned defect, including nano-scale etching and atomic-scale N, O co-doping, was used to modify GF by the molten salt system.
Boosting catalytic activities of carbon felt electrode towards redox ...
Vanadium redox flow batteries (VRFBs) are one of the most promising energy storage systems owing to their safety, efficiency, flexibility and scalability. However, the commercial viability of VRFBs is still hindered by the low electrochemical performance of the available carbon-based electrodes. Defect engineering is a powerful strategy to enhance the …
Electrodes for All-Vanadium Redox Flow Batteries
a Morphologies of HTNW modified carbon felt electrodes.b Comparison of the electrochemical performance for all as-prepared electrodes, showing the voltage profiles for charge and discharge process at 200 mA cm −2. c Scheme of the proposed catalytic reaction mechanisms for the redox reaction toward VO 2+ /VO 2 + using W 18 O 49 NWs modified the gf surface and crystalline …
Large scale preparation of 20 cm × 20 cm graphene modified carbon felt ...
felt f or high performance vanadium r edox flow batte ry Ting Long 1, Yong Long 1, Mei Ding 1,5 ( ) Zhizhao Xu 1, Jian Xu 1, Yiqiong Zhang 1, Mingliang Bai 2, Qijun Sun 3,4,
Outstanding electrochemical performance of a graphene-modified …
In this work, the graphite felt electrode for an iron-vanadium redox flow battery (RFB) with deep eutectic solvent (DES) electrolyte is modified by the method of electrolysis in ammonium sulfate ...
Multiple‐dimensioned defect engineering for graphite felt …
Carbon-based materials like graphite felt have been one of the most potential VRFB''s electrode materials due to the advantages of good chemical stability, high conductivity, strong mechanical properties, and wide electrochemical potential range. 14 However, graphite felt undergoes graphitization treatment of ultrahigh temperature, which results in its poor wettability …
A nitrogen‐doped carbon felt as an electrode material for vanadium flow ...
A novel method of hydrothermal ammoniated treatment on the polyacrylonitrile (PAN)-based graphite felt for vanadium redox flow battery was developed. The graphite felt was treated in a Teflon ...
Vanadium Flow Battery for Energy Storage: Prospects …
The vanadium flow battery (VFB) as one kind of energy storage technique that has enormous impact on the stabilization and smooth output of renewable energy. Key materials like membranes, electrode, and electrolytes …
Graphene/Nafion ink-impregnated graphite felt for both positive …
Electrocatalysts have a key role in the reactions of vanadium redox flow batteries (VRFB). A practical immersion-drying method is used to decorate graphene on graphite felt electrodes. Cyclic voltammograms illustrate that graphene plays an effective role in the formation and stability of redox peaks. Also, voltammograms show the rate capability of modified felts is enhanced …
Analysis of the electrochemical performance of carbon felt …
Correction for ''High efficiency of bamboo-like carbon nanotubes on functionalized graphite felt as electrode in vanadium redox flow battery'' by Yu-Chung Chang et al., RSC Adv., 2016, 6, 102068 ...
The effects of heat treatment on the felt electrodes in …
Carbon-structured felt electrodes are used as electrodes in vanadium redox flow batteries. Chemical, electrochemical and thermal treatments are performed to improve the electrochemical properties ...
Multiple‐dimensioned defect engineering for graphite felt …
The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra‐homogeneous multiple‐dimensioned defect, including nano‐scale etching and atomic‐scale N, O co‐doping, was used to modify GF by the molten salt system. …
Regulating flow field design on carbon felt electrode towards high ...
The same group later scaled up the electrodes with interdigitated flow channels to a 20-cell 1 kW VRFB stack, which demonstrates stable performance in achieving an EE of 80.5% at 80 mA cm −2 ...
The Critical Analysis of Membranes toward Sustainable and …
Vanadium redox flow batteries (VRFB) are considered to be promising for large-scale storage of electrical energy with safety, flexibility, and durability. ... The electrodes for VRFBs typically utilize carbon-based materials such as carbon felt, carbon cloth, and graphite felt, owing to their outstanding attributes including robust oxidation ...
Highly efficient and ultra-stable boron-doped graphite felt electrodes ...
Developing high-performance electrodes with high operating current density and long-term cycling stability is crucial to the widespread application of vanadium redox flow batteries (VRFBs).
Carbon nanofibers embedded in nanopores decorated graphite felt ...
The preparation of carbon nanofibers embedded in nanopores on graphite felt, as depicted in Fig. 1, involved several steps: Pristine graphite felt, 2 mm thick (GF, SGL company, GFA series), was cut into 2 × 2 cm 2 pieces and cleaned twice with ethanol and deionized water. These pieces were then immersed in a 0.1 M Ni(NO 3) 2 solution (98 %, Aladdin, China) in …