Article
Engineering, Chemical
Debabrata Mohanty, Yi-Hung Wang, Ya-Chen Tsai, I-Ming Hung
Summary: Vanadium oxide is an environmentally friendly material, but its economic utilization is challenging due to the inability to control the size of etched holes. In this study, copper/graphite felt composite electrodes with controllable hole depth were prepared by electrodeposition and etching. The composite electrodes exhibited good material characteristics and electrochemical performance under specific etching temperature and time conditions.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Multidisciplinary
Jiaye Ye, Chunhua Zheng, Jie Liu, Tianfu Sun, Shuhui Yu, Huiyun Li
Summary: A novel hybrid membrane for vanadium redox flow batteries has been developed, showing good ion permeation barrier properties, which enhance the stability and energy efficiency of the battery. The design method of this membrane can be extended to other fields such as water treatments and fuel cells.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Sieun Jeon, Heeyeon An, Chanho Noh, Yongchai Kwon, Yongjin Chung
Summary: The MTMO (modified TEMPO mediated oxidation) process was used to increase the carboxylic acid group (COOH) content on the surface of lower crystallinity carbon materials (LCCMs), resulting in improved hydrophilicity without defects. The process is environmentally friendly and has advantages such as a recyclable oxidizing agent and room-temperature aqueous treatment. The MTMO-GF electrodes showed improved performance in vanadium ion redox reaction and vanadium redox flow battery tests, with higher current densities and lower charge transfer resistance compared to CH-GF electrodes.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
L. Mauricio Murillo-Herrera, Eneith S. Aguilar, Michael W. Thielke, Ana Jorge Sobrido
Summary: All-vanadium redox flow batteries (VRFBs) are considered as promising energy storage solutions for intermittent power generation. Commercial graphite felts are commonly used as the electrodes due to their low cost, high conductivity, and large surface area. However, these materials exhibit poor wettability and electrochemical activity towards vanadium redox reactions, leading to overpotentials and lower efficiencies. In this study, deep eutectic solvents (DES) composed of choline chloride and urea, and DES composed of FeCl3 and NH4Cl were used to modify the surface of graphite felts. The modified materials showed improved electrochemical performance and lower charge transfer resistances, suggesting the positive effect of introducing oxygen- and nitrogen-rich functional groups to the felts.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Electrochemistry
Vito Di Noto, Keti Vezzu, Giovanni Crivellaro, Gioele Pagot, Chuanyu Sun, Laura Meda, Iwona A. Rutkowska, Pawel J. Kulesza, Thomas A. Zawodzinski
Summary: The study proposes a comprehensive electrochemical formalism to understand the role of active Vanadium complexes in VRFB performance degradation. It reveals the negative impact of certain redox couples on capacity retention and current density during the charging process. The findings emphasize the need to systematically understand unforeseen phenomena and rationalize the behavior of RFBs based on complex chemistry.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Yi-Hung Wang, I-Ming Hung, Cheng-Yeou Wu
Summary: This study explored a new method of preparing an electrode for a vanadium redox flow battery by depositing vanadium precursor on the surface of graphite felt and calcining vanadium oxide. After testing, it was found that the activated graphite felt showed good capacity utilization and capacity retention in the battery.
Article
Chemistry, Physical
Daniel Manaye Kabtamu, Yu-Zhen Li, Anteneh Wodaje Bayeh, Yun-Ting Ou, Zih-Jhong Huang, Tai-Chin Chiang, Hsin-Chih Huang, Chen-Hao Wang
Summary: This paper presents the successful fabrication of a low-cost platelike bismuth vanadate (BiVO4) material through a simple hydrothermal route, which is used as an electrocatalyst for the negative electrode in vanadium redox flow batteries (VRFBs). The BiVO4-decorated graphite felt (GF) electrode exhibits optimal electrocatalytic activity and reversibility for the redox reactions. The VRFB cell assembled with BiVO4-GF as the negative electrode demonstrates higher energy efficiency and stability compared to the cell with a heat-treated graphite felt (HT-GF) electrode.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Wen-Fei Liu, Kue-Ho Kim, Hyo-Jin Ahn
Summary: In recent years, vanadium redox flow batteries (VRFBs) have gained global attention due to their advantages of large scale, high safety, and long-term cyclability. However, the unsatisfactory kinetics of carbon-based anodes, especially graphite felt (GF), hinders the commercial application of VRFBs. To address this issue, a lamination layer of Nb-doped TiO2 (NTO) is introduced to a heat-treated graphite felt (HGF), which improves the surface properties of GF anodes and enables superior energy storage performance compared with other electrodes. The NTO-HGF anode demonstrates a higher energy efficiency of 82.03% compared to pristine GF.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Environmental
Yingqiao Jiang, Gang Cheng, Yuehua Li, Zhangxing He, Jing Zhu, Wei Meng, Lei Dai, Ling Wang
Summary: This study demonstrates the successful use of metal-organic framework to prepare metal oxide and porous carbon nanocomposite for improving the performance of vanadium redox flow battery. The ZrO2@C/GF composite shows superior effects in promoting diffusion, charge transfer, and electron transport, leading to enhanced stability and electrolyte utilization in the battery.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Zhangxing He, Yanrong Lv, Tianao Zhang, Ye Zhu, Lei Dai, Shuo Yao, Wenjie Zhu, Ling Wang
Summary: Vanadium redox flow battery (VRFB) is a promising renewable energy storage device, but its low energy efficiency has limitations. Improving the catalytic activity of carbon-based materials on vanadium ion through modification is crucial for further development. This review discusses research progress on modification from intrinsic treatment and introduction of catalysts.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Fengjing Jiang, Weineng Liao, Tsubasa Ayukawa, Seong-Ho Yoon, Koji Nakabayashi, Jin Miyawaki
Summary: Surface treatment with cactus-like carbon nanofibers significantly enhances the conductivity of composite bipolar plates, making them promising candidates for vanadium redox flow batteries with excellent durability and high energy efficiency.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Andrea Trovo, Walter Zamboni, Massimo Guarnieri
Summary: An original multichannel Electrochemical Impedance Spectroscopy (EIS) system suitable for high-power Vanadium Redox Flow Batteries (VRFBs) was presented, with a dynamic Thévenin equivalent circuit identified for each cell in the stack. The resistance of the RC loop was found to be strongly affected by mass transport, indicating potential for advanced online state of health monitoring of industrial flow batteries.
JOURNAL OF POWER SOURCES
(2021)
Article
Electrochemistry
L. Guglielmero, Mo. Meskinfam Langroudi, M. Al Khatib, M. Aysla Costa de Oliveira, B. Mecheri, M. De Leo, A. Mezzetta, L. Guazzelli, R. Giglioli, A. D'Epifanio, R. Pogni, C. Chiappe, C. S. Pomelli
Summary: A panel of ionic liquids was synthesized, with 1-butyl-3-methylimidazolium acetate showing a significant increase in the solubility of vanadyl acetylacetonate in acetonitrile. Electrochemical effects of these ionic liquids were investigated, and strong adducts between vanadyl acetylacetonate and ILs were found, supported by DFT studies.
ELECTROCHIMICA ACTA
(2021)
Article
Energy & Fuels
Nicola Poli, Andrea Trovo, Peter Fischer, Jens Noack, Massimo Guarnieri
Summary: All-vanadium flow batteries (VFBs) can experience electrolyte oxidation and/or hydrogen evolution due to extreme states of charge, leading to electrolyte imbalance and reduced battery capacity. This paper presents an electrochemical method using an electrolysis reactor to rebalance the electrolyte and restore VFB capacity. A techno-economical model is developed to analyze the parameters affecting reactor performance and costs, showing that frequent rebalancing operations are economically preferable. Strategies for planned electrolyte rebalancing are proposed to minimize overall costs. Numerical calculations for a 500-kWh VFB indicate a cost reduction of almost 70% can be achieved with more frequent rebalancing processes.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Hyebin Kim, Jung S. Yi, Doohwan Lee
Summary: The study investigates the marked electrocatalytic effects of two-step B and O atomic doping of graphite-felt electrodes for vanadium redox reactions in a vanadium redox flow battery. By controlling the doping sequence and temperature via thermochemical reactions, the kinetic significance of the B and O surface centers for the reactions is identified, leading to improved catalytic activity and specific charge-discharge capacity of the electrodes. With a two-step O and B doping configuration, the B/O-GF electrode shows significantly higher voltage efficiency compared to pristine-GF, demonstrating the potential for enhanced performance in VRFB applications.
ACS APPLIED ENERGY MATERIALS
(2021)
