Article
Thermodynamics
Rui Xiong, Binyu Xiong, Qingyong Zhang, Shaoyue Shi, Yixin Su, Danhong Zhang
Summary: This paper proposes a model for the capacity fading mechanism in VRB by considering the migration of water molecules. The model allows for the observation of electrolyte volume variation and capacity fading, as well as the analysis of reactant concentration imbalance. The influence of water molecule migration on capacity fading is explored through comparative simulation results. The proposed model and in-depth analysis provide a cost-effective way to describe the mechanism of VRB capacity fading.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Sheeraz Mehboob, Ju-Young Lee, Jee Hun Ahn, Saleem Abbas, Xuan Huy Do, Jaewon Kim, Hyun-Jin Shin, Dirk Henkensmeier, Heung Yong Ha
Summary: In this study, multi-layered PANI-Nafion composite membranes with low vanadium ion permeability were successfully fabricated, which greatly improved the performance of VRFBs and preserved electric capacity almost perfectly. The fabricated membrane showed a high coulombic efficiency of 99% and an energy efficiency of 91% at 50 mA cm-2, outperforming the pristine Nafion 115 membrane. Moreover, it exhibited remarkable durability and capacity retention with a 100% discharge capacity retention over 100 cycles of charge/discharge operation.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hee Seo Kim, Yong Jae Suh, Dae Woo Kim, Pham Tan Thong, Ho-Young Jung, Ho-Seok Jeon, In-Su Park, Hye-Jin Hong
Summary: The vanadium redox flow battery has gained extensive attention due to the growing need for safe energy storage systems. The direct recovery of VO(OH)2 from vanadium leaching solution through a reduction-precipitation process simplifies the preparation of a vanadium electrolyte and demonstrates high efficiency in battery performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Chao Hu, Yuming Dong, Wei Zhang, Hongling Zhang, Peng Zhou, Hongbin Xu
Summary: This study proposes a simple, green and low-cost method to prepare mixed valent vanadium electrolyte for vanadium redox flow batteries (VRFB). By using clean hydrogen as the reducing agent and Pt/C as the catalyst, the impurity-free mixed valent vanadium electrolyte is obtained, exhibiting excellent battery performance. Additionally, a catalytic reactor is designed and used for continuous production of the electrolyte. Cost analysis shows that the proposed catalytic hydrogen reduction process can significantly reduce manufacturing costs.
JOURNAL OF POWER SOURCES
(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)
Article
Chemistry, Physical
Hyebin Kim, Jihun Paick, Jung S. Yi, Doohwan Lee
Summary: Heteroatom doping can enhance the electrokinetics of vanadium redox reactions in flow batteries, but this study found that the enhancements observed by p-type and n-type doping are primarily due to surface lattice defects. However, p-n type boron-nitrogen co-doping shows exceptional catalytic activity and significantly improves the efficiency and energy storage capacity of vanadium redox flow batteries.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Hojin Lee, Hansol Choi, Junwon Hwang, Hansung Kim
Summary: The use of PtNi/NC catalyst in the catalytic reduction method improves the conversion rate of vanadium ion and allows for the preparation of impurity-free V3.5+ electrolyte for VRFBs. The catalyst shows enhanced catalytic activity due to the strong interaction with N-doped carbon support and the PtNi alloying effect. The PtNi/NC catalyst is an effective replacement for the commonly used Pt/C catalyst in the catalytic reduction method.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Electrochemistry
Alexandros Pasadakis-Kavounis, Funda Arslan, Mads Radmer Almind, David Aili, Johan Hjelm
Summary: In this study, a series of polybenzimidazole-polyvinylchloride polymer blends decorated with different quaternary ammonium groups were investigated. The blend with 90% polybenzimidazole content and decorated with DABCO showed superior performance, including low polarization resistance, low swelling, and high stability in acidic media. This suggests that quaternary ammonium functionalized polybenzimidazole-polyvinylchloride systems are excellent candidates for modification or fabrication of thinner membranes to reduce membrane resistance without compromising vanadium blocking properties.
BATTERIES & SUPERCAPS
(2023)
Article
Chemistry, Physical
Y. Lei, B. W. Zhang, B. F. Bai, X. Chen, T. S. Zhao
Summary: The study introduces a transient model of VRFB with a bipolar membrane, which improves the Poisson equation to describe the Donnan effect between the two layers for a full description of charge and ion transport. Numerical results demonstrate that bipolar membranes with thin anion exchange layers exhibit higher energy efficiency at large current densities.
JOURNAL OF POWER SOURCES
(2021)
Article
Polymer Science
Tongshuai Wang, Jannice Lee, Xiaofeng Wang, Kun Wang, Chulsung Bae, Sangil Kim
Summary: The incorporation of CNT in ion exchange membrane can effectively reduce membrane resistance, improve battery efficiency and stability, and enhance performance in VRFBs.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Energy & Fuels
Jungmyung Kim, Heesung Park
Summary: This study introduces a segmented cell to measure the electrochemical reaction kinetics in a porous electrode of a vanadium redox flow battery in real time, visualizing the non-uniform mass transfer characteristics through localized electrical potentials. The mass transfer characteristics of the electrodes are discussed based on essential operating factors, and the polarization effect of the felt electrode during the charging and discharging process is explained by comparing voltage deviations. The optimal flow rate for improving electrochemical reversibility is found to be 400 mL min-1.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Tao Zou, Lijuan Luo, Yuwu Liao, Peiyuan Wang, Jun Zhang, Longhai Yu
Summary: This experiment utilized a 10 kW household vanadium redox flow battery energy storage system to study the operation conditions. The system showed good performance with high charge & discharge efficiency. The energy consumption of each unit was reasonable, and the system exhibited good stability.
JOURNAL OF ENERGY STORAGE
(2022)
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
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.
Review
Energy & Fuels
Zebo Huang, Anle Mu
Summary: Vanadium redox flow batteries (VRFBs) are increasingly utilized in renewable energy storage and microgrid systems, offering a solution to the intermittent nature of renewable energy sources. This research emphasizes on enhancing the overall performance of VRFBs without the need for new component materials.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Ting-Chia Ou, Wei-Fu Su, Xian-Zong Liu, Shyh-Jier Huang, Te-Yu Tai
Article
Energy & Fuels
Ting-Chia Ou, Kai-Hung Lu, Chiou-Jye Huang
Article
Thermodynamics
Chih-Ming Hong, Ting-Chia Ou, Kai-Hung Lu
Article
Thermodynamics
Ting-Chia Ou, Chih-Ming Hong
Article
Thermodynamics
Whei-Min Lin, Chih-Ming Hong, Ting-Chia Ou, Tai-Ming Chiu
ENERGY CONVERSION AND MANAGEMENT
(2011)
Article
Automation & Control Systems
Whei-Min Lin, Chih-Ming Hong, Cong-Hui Huang, Ting-Chia Ou
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
(2013)
Article
Engineering, Electrical & Electronic
Shyh-Jier Huang, Xian-Zong Liu, Wei-Fu Su, Ting-Chia Ou
IEEE TRANSACTIONS ON POWER DELIVERY
(2013)
Article
Engineering, Electrical & Electronic
W. -M. Lin, T. -C. Ou
IET GENERATION TRANSMISSION & DISTRIBUTION
(2011)
Article
Engineering, Electrical & Electronic
Ting-Chia Ou
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2012)
Article
Engineering, Electrical & Electronic
Ting-Chia Ou
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2013)
Article
Computer Science, Hardware & Architecture
Yuan-Ho Chen, Chih-Wen Lu, Shian-Shing Shyu, Chung-Lin Lee, Ting-Chia Ou
JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS
(2014)
Proceedings Paper
Energy & Fuels
Whei-Min Lin, Chia-Sheng Tu, Ou Ting-Chia
ADVANCES IN ENERGY SCIENCE AND TECHNOLOGY, PTS 1-4
(2013)