Article
Chemistry, Multidisciplinary
Deokhyun Hwang, Jong-Wook Ha, Young Soo
Summary: This study demonstrates a simple one-pot process for the preparation of V3.5+ electrolytes from V2O5 using hydrazine monohydrate as a residue-free reducing agent and molybdenum as a homogeneous catalyst. The developed process exhibits scalability and high reproducibility, contributing to the wide application of VRFBs as large-scale and long-term energy storage systems.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Pavel Loktionov, Dmitry Konev, Roman Pichugov, Mikhail Petrov, Anatoly Antipov
Summary: An operando coulometric analysis method for assessing vanadium redox flow battery (VRFB) electrolyte is proposed, which detects the overall vanadium content and average oxidation state (AOS), and performs stably under imbalance conditions.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Analytical
Pavel Loktionov, Roman Pichugov, Dmitry Konev, Mikhail Petrov, Alla Pustovalova, Anatoly Antipov
Summary: Optical spectroscopy is a promising method to address the challenge of monitoring the state of charge in vanadium redox flow batteries (VRFB), but existing approaches have limitations, such as limited applicability, uncertainty in accounting for electrolyte imbalance, and applicability restrictions for mixed acid electrolytes. The proposed method based on deconvolution of electrolyte absorption spectra successfully determines the SoC of VRFB and shows good accuracy in determining vanadium concentration and SoC in both half-cells. Additionally, this method allows for obtaining complex spectra, including new complexes in both positive and negative electrolytes.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Energy & Fuels
Z. H. Zhang, L. Wei, M. C. Wu, B. F. Bai, T. S. Zhao
Summary: Utilizing chloride ions as additives in electrolytes can enhance the performance of vanadium redox flow batteries, especially with the optimum concentration. Adding chloride ions can improve the energy efficiency, rate capability, and cycle life of the batteries.
Article
Chemistry, Analytical
Jusong Wi, Songhyok Jon, Gukhyon Pae, Yongok Kim, Sangmo Jon
Summary: In this study, a digital imaging method was proposed to analyze the concentrations of V(IV) and V(III) in vanadium electrolyte. The blue channel exhibited the best sensitivity and linearity. The method showed high precision and good agreement with potentiometric titration.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Roman Pichugov, Pavel Loktionov, Alla Pustovalova, Artem Glazkov, Aleksei Grishko, Dmitry Konev, Mikhail Petrov, Andrey Usenko, Anatoly Antipov
Summary: One of the major challenges in VRFB is the gradual decrease of available capacity over time. The capacity fade is a complex issue affecting the volume, total content, and average valence of vanadium ions. Intermittent mixing of electrolytes and optimizing electrolysis conditions can restore the initial performance parameters regardless of the magnitude of capacity drop.
JOURNAL OF POWER SOURCES
(2023)
Article
Energy & Fuels
Ivan Kuzmin, Alexey Loskutov, Evgeny Osetrov, Andrey Kurkin
Summary: The article discusses the urgent task of developing and mass producing energy storage systems, specifically focusing on flow batteries and uninterruptible power systems. Flow batteries are seen as an efficient solution for long-term energy storage, with vanadium redox flow batteries being of particular interest due to their long service life. The key elements of a flow battery are the stack and the electrolyte, which determine the power, efficiency, energy capacity, and service life of the battery.
Article
Green & Sustainable Science & Technology
Ning-Yih Hsu, Nitika Devi, Yu- Lin, Yi-Hsin Hu, Hung-Hsien Ku, Amornchai Arpornwichanop, Yong-Song Chen
Summary: This study investigates the performance of hydrogen-vanadium redox flow batteries under various conditions, finding that platinum loading and positive electrolyte flow rate significantly impact battery performance, with the best performance achieved at a catalyst loading of 0.3 mg Pt cm(-2) and a positive electrolyte flow rate of around 2 L h(-1). The HVRFB demonstrates an energy efficiency of around 88% when operated at a current density of 80 mA cm(-2) for 200 cycles.
Review
Chemistry, Multidisciplinary
Yun Guo, Jie Huang, Jun-Kai Feng
Summary: All-vanadium redox flow battery (VRFB) has attracted great attention from scholars at home and abroad as a large energy storage battery. The electrolyte, as the active material of VRFB, has been the focus of research. This work reviews the preparation methods of VRFB electrolyte, with emphasis on chemical reduction, electrolysis, solvent extraction, and ion exchange resin. The principles, technological processes, advantages, and disadvantages of each method are briefly described. The effects of different additives on high concentration electrolyte are also introduced. Finally, the development of vanadium electrolyte preparation technology is prospected.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Electrochemistry
Pavel Loktionov, Roman Pichugov, Dmitry Konev, Anatoly Antipov
Summary: The gradual capacity fade of vanadium redox flow batteries (VRFB) is a major challenge for the further distribution of this technology. Recent studies suggest that the increase of the electrolyte average oxidation state (AOS) due to chemical and electrochemical side reactions is a major contributor to capacity fade, rather than just vanadium ions crossover. While many methods for capacity fade mitigation have been proposed, very little attention has been given to battery capacity recovery. This study proposes a novel method for operando VRFB capacity recovery, utilizing partial electro-reduction of the electrolyte in an electrolysis cell. The integration of this rebalancing system allows for high battery performance while maintaining nominal capacity indefinitely.
ELECTROCHIMICA ACTA
(2022)
Article
Energy & Fuels
Marco Cecchetti, Francesco Toja, Andrea Casalegno, Matteo Zago
Summary: In this study, a new and comprehensive approach is proposed to investigate vanadium cross-over. By using charge-discharge cycles with fixed exchanged capacity and measuring the self-discharge of the single electrolyte solutions through-plate reference electrodes, the involved physics in different operating conditions can be accurately described. A 1D physically-based model of the battery operation is developed and calibrated on electrolyte imbalance data to investigate the main vanadium transport mechanisms and evaluate the influence of current density on vanadium crossover fluxes and self-discharge rate of the electrolyte.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Electrochemistry
Thomas Puleston, Alejandro Clemente, Ramon Costa-Castello, Maria Serra
Summary: This review provides a comprehensive study of the different types of dynamic models and model-based estimation strategies for redox flow batteries. Due to the complexity of obtaining system internal states directly from experimental measures, many proposals have been developed to rely on easily measurable variables using mathematical models. Finally, the remaining challenges and possible future research directions in this field are discussed.
Article
Energy & Fuels
Thomas Puleston, Maria Serra, Ramon Costa-Castello
Summary: This study derives generalised SOC and SOH indicators that consider electrolyte imbalance and analyzes the impact of electrolyte imbalance on battery capacity. The results show that standard electrolyte remixing may reduce battery capacity under certain imbalance conditions, while introducing a mass imbalance can mitigate capacity loss caused by oxidation.
Article
Energy & Fuels
Kyu Heon Rho, Sang Jun Yoon, Jaiyoung Ryu, Sung Min Cho, Min Soo Kim, Dong Kyu Kim
Summary: This study investigates the temperature distribution of vanadium redox flow batteries and identifies the factors that influence temperature through experiments and theoretical analysis. The results show that the temperature of the electrodes varies during charge and discharge processes, with differences compared to the outside temperature. The operating conditions, including current density, flow rate, and cell design, significantly affect the minimum temperature. An empirical equation is developed to determine the proper operating conditions for preventing precipitation in cold climates.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
X. Michel Myures, S. Suresh
Summary: In this study, nitrogen-doped reduced graphene oxide (N-rGO) was synthesized as an electro-catalyst for the positive half-cell in VRFB. The nanofluidic electrolyte based on N-rGO exhibited better electrochemical reversibility and improved performance in terms of current density, overpotential, and charge transfer resistance compared to the base electrolyte. The enhanced electrochemical performance was attributed to the increased electrochemical surface area, electrical conductivity of N-rGO, and improved hydrophilicity of the nanofluid.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Simon Ressel, Armin Laube, Simon Fischer, Antonio Chica, Thomas Flower, Thorsten Struckmann
JOURNAL OF POWER SOURCES
(2017)
Article
Chemistry, Physical
Simon Ressel, Florian Bill, Lucas Holtz, Niklas Janshen, Antonio Chica, Thomas Flower, Claudia Weidlich, Thorsten Struckmann
JOURNAL OF POWER SOURCES
(2018)
Article
Biochemistry & Molecular Biology
Theresa Haisch, Hyunjoon Ji, Lucas Holtz, Thorsten Struckmann, Claudia Weidlich
Summary: The study examines the impact of membrane crossover in vanadium flow batteries on the battery’s state of charge, and presents a method to determine crossover direction and amount. An index is introduced to aid in identifying the predominant self-discharge in the battery half-cells. The research suggests that monitoring half-cell potential or estimating state of charge is an effective tool for understanding crossover in VFB systems.
Article
Chemistry, Physical
A. Laube, A. Hofer, S. Ressel, A. Chica, J. Bachmann, T. Struckmann
Summary: The study demonstrates the feasibility of a PEM water electrolysis cell design using atomic layer deposition (ALD) in sulfuric acid, achieving high current density and activity by reducing iridium and platinum catalyst loading. Detailed analysis confirms the reproducibility of the cell setup, and further research shows increasing cell performance with more coating cycles.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Electrochemistry
Andre Hofer, Sebastian Wachter, Dirk Doehler, Armin Laube, Beatriz Sanchez Batalla, Zongwen Fu, Claudia Weidlich, Thorsten Struckmann, Carolin Koerner, Julien Bachmann
Summary: This study demonstrates the suitability of 3D printing for producing titanium alloy scaffolds for water oxidation electrodes. The scaffolds can be nanostructured through electrochemical anodization and coated with iridium as an electrocatalyst. The performance and stability of the functional electrodes were characterized under relevant conditions, showing that different preparative conditions can significantly affect the performance and stability.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
A. Laube, A. Hofer, B. Sanchez Batalla, S. Ressel, A. Chica, S. Fischer, C. Weidlich, J. Bachmann, T. Struckmann
Summary: This study demonstrates the feasibility of a tubular PEM electrolyzer membrane electrode assembly (MEA) for the oxygen half cell with a diameter of 5.0 mm. The combination of an extruded perfluorosulfonic acid (PFSA) cation exchange membrane and a porous transport electrode (PTE) with a low iridium catalyst loading obtained by atomic layer deposition (ALD) shows high performance in sulfuric acid. This tubular design offers cost reductions and higher iridium mass activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
B. Sanchez Batalla, A. Laube, A. Hofer, T. Struckmann, J. Bachmann, C. Weidlich
Summary: This study investigates the activity and durability of a polymer electrolyte membrane (PEM) water electrolysis single cell assembled with porous transport electrodes (PTEs) with low catalyst loading for 500 hours. A current density of 160 mA/cm2 and a high mass activity of 1368 A/gIr were achieved at 60 degrees C with 1 mol/L sulfuric acid. The degradation of the cell was characterized using various electrochemical and physicochemical methods, and the average degradation rate of the cell was determined to be 67 mV/h at 15 mA/cm2. This is the first investigation of the long-term performance of a PEM water electrolysis cell assembled with PTEs coated by ALD.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Simon Ressel, Peter Kuhn, Simon Fischer, Michael Jeske, Thorsten Struckmann
Summary: The study demonstrates the feasibility of extruded tubular VRFB cells with high power density in the flow-by electrode configuration. The extruded cell components include a perfluorosulfonic acid cation exchange membrane with a diameter of 5.0 mm and carbon composite current collectors. The cell performance is characterized by various measurements, with a maximum volumetric power density of 407 kW/m(3) and a maximum current density of 500 mA/cm(2) achieved.
JOURNAL OF POWER SOURCES ADVANCES
(2021)
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)
