Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 427 - 459
Published: Nov. 29, 2024
Language: Английский
Applied Sciences, Journal Year: 2024, Volume and Issue: 14(8), P. 3316 - 3316
Published: April 15, 2024
In this paper, bismuth (Bi) was successfully deposited on graphite felts to improve the electrochemical performances of vanadium redox flow batteries. Modified with different Bi particle loadings were obtained through deposition at voltages 0.8 V, 1.2 V and 1.6 in 0.1 M BiCl3 solution for 10 min. The optimal loading confirmed by scanning electron microscopy (SEM), single cells tests. SEM images revealed granular particles fiber surface. Bi-modified which electro-chemically (Bi/TGF-1.2V) showed excellent cyclic voltammetry curves impedance spectroscopy. Meanwhile, assembled Bi/TGF-1.2V as negative electrodes exhibited higher voltage efficiencies than others. optimized induced better catalysis V3+/V2+ reaction hence significantly improved cell performances. addition, prepared stable slower charge–discharge capacity declines other current densities between 20 mA/cm2 80 mA/cm2. Compared pristine felt, efficiency battery felt 9.47% density proposed method has considerable potential guiding significance future modification
Language: Английский
Citations
13
Small, Journal Year: 2024, Volume and Issue: unknown
Published: July 1, 2024
Vanadium redox flow battery (VRFB) is a type of energy storage device known for its large-scale capacity, long-term durability, and high-level safety. It serves as an effective solution to address the instability intermittency renewable sources. Carbon-based materials are widely used VRFB electrodes due cost-effectiveness well-stability. However, pristine need proper modification overcome original poor hydrophilicity fewer reaction active sites. Adjusting carbon structure recognized viable method boost electrochemical activity electrodes. This review delves into advancements in research related ordered disordered including adjusting methods, structural characteristics, catalytic properties. Ordered structures categorized nanoscale macroscale orderliness based on size, leading improved conductivity overall performance electrode. Disordered encompass methods such doping atoms, grafting functional groups, creating engineered holes enhance sites hydrophilicity. Based current findings electrode structures, this work puts forth some promising prospects future feasibility.
Language: Английский
Citations
9
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 486, P. 149946 - 149946
Published: Feb. 28, 2024
Language: Английский
Citations
7
Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(13), P. 12202 - 12211
Published: June 20, 2024
As a large-scale electrochemical energy storage technology, iron–chromium redox flow batteries (ICRFBs) have the advantages of intrinsic safety, environmental friendliness, low raw material cost, long cycle life, etc. However, there is currently problem poor reaction activity Cr3+/Cr2+. Herein, composite electrode [PDA–Bi–treated carbon cloth (TCC)] modified with polydopamine (PDA)-assisted immobilization bismuth oxide (Bi2O3) catalyst prepared. Bi2O3 as can enhance reactions. The self-assembly process PDA not only serves to immobilize catalysts and bind them surface CC but also nitrogen-doping agent, providing more active sites for electrodes. benefits excellent physical performance PDA–Bi–TCC are that efficiency ICRFBs remains at 81.78% current density 140 mA/cm2, far higher than original TCC electrode. At 80 it even achieved an 86.23%. In addition, long-term stability capable stably conducting 300 charge–discharge cycles mA/cm2. These results demonstrate potential electrodes improve provide possibilities engineering application ICRFBs.
Language: Английский
Citations
7
Catalysts, Journal Year: 2025, Volume and Issue: 15(4), P. 345 - 345
Published: April 1, 2025
Considering the various morphologies of carbon nanotubes (CNTs), it is expected to solve contradiction between concentration polarization and electrochemical in vanadium redox flow batteries (VRFBs). This paper investigates structural evolution CNTs grown on surface thermally oxidized cloth (TCC) their impact performance VRFBs. The morphological results indicate that thermal oxidation treatment forms pores TCC, providing nucleation sites for CNT growth. Spiral-shaped (TCC@s-CNTs) were formed a short growth time (1 h), high defect density originated from non-steady-state supply sources dynamic behavior catalyst. While 3 h network structure (TCC@n-CNT), van der Waals force drives self-assembly its three-dimensional network. Although TCC@s-CNT exhibits catalytic activity due edge active sites, VRFBs more dependent conductive TCC@n-CNT. At 240 mA/cm2, energy efficiency (EE) VRFB assembled with TCC@n-CNT reaches 71%, capacity retention rate 15% higher than TCC@s-CNT. work reveals synergistic mechanism morphology regulation electrode provides theoretical guidance design electrodes.
Language: Английский
Citations
0
Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown
Published: April 24, 2025
Abstract The thermal treatment method is a leading approach for enhancing the insufficient electrochemical activity of graphite felts (GFs) as electrodes in iron‐chromium redox flow batteries (ICRFBs). Therefore, design parameters plays crucial role thermally‐treated GFs (TGFs), considered one most effective ways to mitigate polarization, ohmic and concentration polarization ICRFBs. In paper, TGFs were determined be 500 °C 15 h at sample density 0.5 g/L. reaction processes occurring on surface decoupled quantified into capacitance values determine their correlation with cell performance. essence area, oxygen functional groups, fiber substrate was further investigated. fact, presence groups can enhance electrolyte adsorption C─O being improving rate. Additionally, carbon structure area have significant impact core electron delivery component This study provides comprehensive assessment influence performance, while also establishing theoretical foundation development modification specific other system.
Language: Английский
Citations
0
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: May 2, 2025
Abstract Rapid growth of the electronics industry has led to increased electromagnetic (EM) pollution, necessitating development effective EM interference (EMI) shielding materials. Integrating carbon materials with magnetic metals or alloys is a promising approach, but high conductivity and low skin depth often result in reflection over absorption waves (EMWs). To address this challenge, flexible cloth (CC)‐based composites are developed that allow controlled orientation chains (Co, Ni, CoNi) grown on CC surface, thereby enhancing absorption‐dominated EMI shielding. By applying an external field, uniform substrate angles 0°, 60°, 90° fabricated. Density Functional Theory calculations reveal CC@Co exhibits higher polarization loss compared CC@Ni CC@CoNi. Reorienting Co from random parallel (0°) alignment improves total effectiveness 34.3 35.4 dB increases absorptivity 0.299 0.611. This improvement attributed enhanced dissipation incident energy, as evidenced by reduced internal electric field strengths. work demonstrates method for optimizing balance between through structural design.
Language: Английский
Citations
0
Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 683, P. 713 - 721
Published: Dec. 12, 2024
Language: Английский
Citations
3
Energy Advances, Journal Year: 2024, Volume and Issue: 3(9), P. 2220 - 2237
Published: Jan. 1, 2024
This research aims to advance the field of vanadium redox flow batteries (VRFBs) by introducing a pioneering approach optimize microstructural characteristics carbon cloth electrodes.
Language: Английский
Citations
2
ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(27), P. 10139 - 10151
Published: June 21, 2024
This study addresses the critical need for advancements in power density and energy efficiency widespread adoption of vanadium redox flow batteries (VRFBs). We introduce a novel, productive, environmentally friendly direct mechanochemical method to synthesize nitrogen-doped graphite nanoparticles (GrNs) as efficient electrocatalysts ion reactions (VO2+/VO2+ V2+/V3+). Through low-temperature delamination an ammonia atmosphere, we achieve GrNs with highly defective structure. The duration treatment can significantly impact nature catalytically active centers and, hence, electrocatalytic performance obtained materials. Our findings demonstrate that GrN6, prepared 6 h treatment, exhibits remarkable VRFB. GrN6-based VRFB, operating at current 250 mA cm–2, showcases impressive 77% over 500 cycles, coupled peak ∼530 mW exceeding VRFBs conventional felt electrodes (whose does not exceed 70% 150 cm–2). innovative approach only provides but also aligns principles, offering promising prospects greener landscape.
Language: Английский
Citations
1