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
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, 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
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
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, Physical
Hongwei Li, Huina Wang, Yueyang Xie, Yukun Wang, Guanghong Yan, Bin Wang, Fei Xue
Summary: In this study, oxygen and nitrogen doping in graphite felt (GF) was achieved through Fe etching and nitrogen functionalization using K2FeO4 and NH3. The modified GF showed enhanced disordered structure and increased oxygen and nitrogen functional groups. The energy efficiency of the modified GF electrode remained at 81.8% after 50 charge-discharge cycles, indicating improved performance of the VRFB.
Article
Chemistry, Physical
Jungyeon Ji, Chanho Noh, Mingyu Shin, Seunghye Oh, Yongjin Chung, Yongchai Kwon, Do-Heyoung Kim
Summary: A new and economical mesoporous nitrogen-doped carbon structure was prepared using sodium citrate and urea precursors and doped onto graphite felt electrodes. The catalytic properties of the doped electrode were compared with pristine graphite felt and sodium citrate-doped graphite felt electrodes. The results showed that the SC/U-GF electrode exhibited excellent catalytic activity and improved reactivity and reversibility of redox reactions.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yuchun Ren, Zerong Li, Biao Deng, Chen Ye, Longcheng Zhang, Yan Wang, Tingshuai Li, Qian Liu, Guanwei Cui, Abdullah M. Asiri, Yonglan Luo, Xuping Sun
Summary: Renewable electricity-powered hydrogen production serves as an attractive alternative to unsustainable industrial processes, yet the large-scale implementation requires efficient and noble-metal-free electrocatalysts. This study introduces a CoP nanowire array on porous graphite felt as a new 3D electrocatalyst for enhanced hydrogen evolution reaction, showing impressive activity and long-term durability under alkaline conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Qingchun Jiang, Yujie Ren, Yujie Yang, Honghao Liu, Ling Wang, Jin Li, Lei Dai, Zhangxing He
Summary: In this paper, a composite electrode with Fe, N, S co-doped carbon nanofibers in situ supported on graphite felt surface (GF@Fe-N/S-CNFs) was prepared using bimetal-organic framework as precursor. The modified battery using GF@Fe-N/S-CNFs exhibits excellent electrocatalytic activity and higher energy and voltage efficiencies than the blank battery. It can also run smoothly at high current density and maintain excellent energy efficiency during charge-discharge cycles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ting Long, Yong Long, Mei Ding, Zhizhao Xu, Jian Xu, Yiqiong Zhang, Mingliang Bai, Qijun Sun, Gen Chen, Chuankun Jia
Summary: In this study, a large area graphene modified carbon felt electrode was successfully prepared by chemical vapor deposition, which significantly improved the electrochemical performance of vanadium redox flow batteries. The graphene decoration provided abundant active sites for redox reactions, resulting in enhanced voltage efficiency and energy efficiency compared to pristine carbon felt electrodes. Additionally, the high retention value over 600 cycles demonstrates the promising potential of this electrode for next-generation VRFBs.
Article
Chemistry, Physical
Reed M. Wittman, Cassandria Poirier, Harry D. Pratt III, Travis M. Anderson, Yuliya Preger
Summary: Mixed-acid vanadium redox flow batteries (VRFBs) have the potential to increase energy density and temperature stability for grid energy storage applications. However, their use of hydrochloric acid introduces a safety risk due to chlorine gas (Cl2) generation. This study presents direct measurements of Cl2 generation in a mixed-acid VRFB and proposes mitigation strategies.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Jiayou Ren, Zhenyu Wang, Jing Sun, Zixiao Guo, Bin Liu, Xinzhuang Fan, Tianshou Zhao
Summary: In this study, a new in-situ electrodeposition strategy of bismuth was developed to achieve uniform and dense deposition of bismuth nanoparticles onto graphite fibers of a scale-up anode. Compared with conventional methods, this strategy prevented the oxidation of bismuth nanoparticles by vanadium ions, resulting in higher energy efficiency and stable operation of vanadium redox flow batteries.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Xuewen Wu, Zhiyong Xie, Haikun Zhou, Zi'ang Xiong, Xingrong Yin, Hongli Tang, Qiang Ma, Jingjing Liao
Summary: A new method using nitric acid vapor treatment is developed for preparing modified graphite felt. This method offers advantages in convenience, efficacy, and controlability over traditional impregnation methods. The modified graphite felt exhibits excellent electrocatalytic activity and double layer capacity, resulting in significantly improved energy efficiency and discharge capacity.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Justyna Piwek, Gabriel Gonzalez, Pekka Peljo, Elzbieta Frackowiak
Summary: In this study, carbon felt electrodes were chemically treated with an alkali metal salt to improve their electrochemical performance. The results showed that the chemically treated electrodes exhibited better performance with lower overpotentials and higher efficiencies. Additionally, the oxidation time of the electrodes could be significantly reduced by using a nitrate salt oxidation method.
Article
Energy & Fuels
Seunghye Oh, Chanho Noh, Mingyu Shin, Yongchai Kwon
Summary: In this study, Fe(TEA)-TGF is used to improve the performance of VRFB by forming a two-scale mesoporous structure on the GF electrode. The treated electrode shows significantly increased specific surface area and active sites, leading to reduced overvoltage and improved energy efficiency. The results demonstrate that Fe(TEA)-TGF can enhance the performance of VRFB, even at high current density ranges.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Analytical
Mohammad Mohsen Loghavi, Hossein Mohammadi-Manesh, Rahim Eqra
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2019)
Article
Electrochemistry
Mohammad Zarei-Jelyani, Mohsen Babaiee, Shaghayegh Baktashian, Rahim Eqra
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2019)
Article
Chemistry, Physical
Mohammad Mohsen Loghavi, Saeed Bahadorikhalili, Najme Lari, Mohammd Hadi Moghim, Mohsen Babaiee, Rahim Eqra
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
(2020)
Article
Chemistry, Physical
Mehrdad Gholami, Mohammad Zarei-jelyani, Mohsen Babaiee, Shaghayegh Baktashian, Rahim Eqra
Article
Chemistry, Analytical
Mohammad Mohsen Loghavi, Rahim Eqra, Hossein Mohammadi-Manesh
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Mohammad Mohsen Loghavi, Mohsen Babaiee, Rahim Eqra
Summary: A composite cathode material containing Al2O3-coated LiNi0.8Co0.15Al0.05O2 (NCA) and graphene was prepared using ultrasonication and mechanical ball milling. The composite material exhibited stable cycling performance and improved capacity retention and rate capability. Graphene acted as a protective layer on the particles and provided a conductive medium in the electrode structure.
MAIN GROUP CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mohsen Babaiee, Shaghayegh Baktashian, Mohammad Zarei-Jelyani, Rahim Eqra, Mehrdad Gholami
Summary: In this study, the performance of natural graphite anode was improved by adding TiO2 nanoparticles. The best performance was achieved when the graphite anode was made with 10% concentration of TiO2 emulsion. The addition of TiO2 nanoparticles improved the surface coating and electrochemical performance of the NG-T10 electrode, resulting in excellent cycle performance and capacity retention.
Article
Chemistry, Multidisciplinary
Mohammad Mohsen Loghavi, Ashkan Nahvibayani, Mohammad Hadi Moghim, Mohsen Babaiee, Shaghayegh Baktashian, Rahim Eqra
Summary: Three types of lithium nickel-manganese-cobalt oxide (NMC) cathode materials (NMC532, NMC622, and NMC811) were evaluated and compared for lithium-ion batteries. The study investigated the impact of transition metals (Ni, Mn, and Co) on the electrochemical performance of the cathode materials. It was found that Ni and Co influenced the initial capacity, while capacity retention was determined by material stability, balanced by the ratio adjusting of Ni, Mn, and Co. Mn and Co provided chemical and structural stability for NMC materials.
MONATSHEFTE FUR CHEMIE
(2022)
Article
Electrochemistry
Mohammad Zarei-Jelyani, Mohammad Mohsen Loghavi, Mohsen Babaiee, Rahim Eqra
Summary: The effects of charge current density (CDChg), discharge current density (CDDchg), and their simultaneous change on the performance of VRFB were investigated. The study also examined crossover and ohmic polarization to understand how current density impacts VRFB characteristics. Generally, increasing CDChg, CDDchg, or both leads to a decrease in charge and discharge capacities, energies, and voltage efficiency. Coulombic efficiency generally increases with increasing current density. Increasing CDChg has no significant impact on discharge voltage, while increasing CDDchg does not significantly change charge voltage. Low currents result in more crossover of vanadium ions, reducing coulombic efficiency. High charging currents reduce crossover but lead to high ohmic polarization, reducing capacity and voltage efficiency.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Mohammad Mohsen Loghavi, Mohammad Zarei-Jelyani, Mohsen Babaiee, Zeinab Niknam, Rahim Eqra
Summary: Research shows that decorating graphite felt electrodes with graphene can enhance the electrocatalytic properties in vanadium redox flow batteries, improving capacity, energy density, and power. Modified electrodes have larger surface area, create a better conductive network, and accelerate charge transfer with the help of the catalyst. A simple, inexpensive, and scalable method for graphene decoration on graphite felt is suitable for both positive and negative electrodes and can enhance high-rate charging and discharging capabilities of vanadium batteries.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Energy & Fuels
Sahar Ziraki, Mansour Kanani, Babak Hashemi, Mohammad Mohsen Loghavi
Summary: The addition of sodium (Na) and yttrium (Y) has a positive effect on the structural and thermal stability of NCA cathode material. Experimental and theoretical studies found that 0.5% Na+ and Y3+ were the optimal doping amounts in single-doped samples, while 0.5% of each dopant (0.5Na-0.5Y-NCA) produced the best results in co-doped samples. The 0.5Na-0.5Y-NCA sample retained 92.34% of its capacity after 100 charge and discharge cycles at a rate of 0.5C, compared to 67.11% for the pristine NCA.
JOURNAL OF ENERGY STORAGE
(2023)
