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
Yunhui Lv, Zhefei Pan, Xuelong Zhou, Ningxin Xiong, Fang Wang, Yongliang Li, Qixing Wu
Summary: In this study, a flexible carbon sponge is characterized and proposed as an alternative electrode for vanadium redox flow batteries. The carbon sponge exhibits higher energy efficiency and better operating stability compared to commonly-used graphite felt electrodes.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Chemistry, Physical
Seong-Cheol Kim, Jihun Paick, Jung S. Yi, Doohwan Lee
Summary: The study shows that surface defects of carbon electrodes rather than doped oxygen species are the most relevant active centers for intrinsic vanadium redox kinetics.
JOURNAL OF POWER SOURCES
(2022)
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
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, 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
Victor A. Beck, Jonathan J. Wong, Charles F. Jekel, Daniel A. Tortorelli, Sarah E. Baker, Eric B. Duoss, Marcus A. Worsley
Summary: Porous electrodes play a crucial role in electrochemical technologies, where controlling fluid distribution, species transport, and reactive environment is vital for achieving high performance. Architectured electrodes and computational design methods offer improved power efficiency compared to conventional electrode materials.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Kerstin Koeble, Laszlo Eifert, Nico Bevilacqua, Kieran F. Fahy, Aimy Bazylak, Roswitha Zeis
Summary: This study investigates electrolye invasion and distribution in heat-treated carbon felt electrodes using synchrotron X-ray radiography, finding that higher compression ratios lead to greater electrode utilization. Increasing flow velocity after injection causes boundary area filling, which is critical for electrode utilization.
JOURNAL OF POWER SOURCES
(2021)
Article
Materials Science, Multidisciplinary
Kwang Il Jeong, Su Hyun Lim, Hyunsoo Hong, Jae-Moon Jeong, Won Vin Kim, Seong Su Kim
Summary: This study proposes a new approach to adjust the local compression ratio of carbon felt electrodes in vanadium redox flow batteries. By creating a compression stiffness gradient, the electrode with the stiffness gradient achieves higher energy efficiency in the VRFB.
APPLIED MATERIALS TODAY
(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
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)
Review
Chemistry, Physical
Cong Ding, Zhefei Shen, Ying Zhu, Yuanhui Cheng
Summary: The vanadium redox flow battery (VRFB) is a promising stationary electrochemical storage system due to its flexibility, long cycle life, high efficiency, and safety. However, the commonly used carbonous felt electrode has limitations in terms of kinetic reversibility and catalytic activity. To overcome these limitations, various modification methods have been explored, such as surface treatment, deposition of low-cost metal oxides, doping of nonmetal elements, and complexation with nanostructured carbon materials. These modifications have led to increased surface area and active sites, improving the performance of carbonous felt electrodes.
Article
Chemistry, Physical
Jing Sun, Yuhan Wan, Qinping Jian, Xinzhuang Fan, Tianshou Zhao
Summary: This article reports a sponge-like microfiber carbon electrode with a large specific surface area, which can achieve efficient operation in high-performance redox flow batteries and has good cycling stability. The strategy to fabricate sponge-like porous carbon microfibers holds great promise for versatile applications.
Article
Materials Science, Multidisciplinary
Jae-Moon Jeong, Kwang Il Jeong, Jae Hyung Oh, Yong Sik Chung, Seong Su Kim
Summary: In this study, a method is developed to enhance the performance of carbon paper (CP) electrodes for flow-through type vanadium redox flow batteries (VRFBs) by creating a pseudo-channel effect through holey patterns. Numerical simulations and cyclic voltammetry tests were used to analyze electrolyte flow characteristics and electrochemical properties, while single-cell tests were conducted to analyze electrode performances. The results showed that the overall flow rate inside the electrode increased substantially and the flow distribution became more uniform, leading to an increase in efficiency. The energy efficiency of the H-CP electrode at a current density of 100 mA cm(-2) increased by 10.41% and 4.34% compared to unpatterned CP and heat-treated CF electrodes, respectively.
APPLIED MATERIALS TODAY
(2021)
Article
Engineering, Environmental
Sieun Jeon, Heeyeon An, Yongjin Chung
Summary: P-doped, O-rich graphitic carbon (POGC) with high catalytic activity and improved electrical conductivity was synthesized using an environmentally friendly microwave (MW)-assisted treatment. This treatment increased the graphitization degree and P-C bonds, resulting in enhanced redox reactions and reduced charge-transfer resistance. POGC combined with graphite felt (GF) electrodes showed improved efficiencies, discharge capacities, and long-cycle stability for vanadium redox flow batteries (VRFBs).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Civil
Qiang Ma, Jia Mou, Henglin Xiao, Zhizao Bao
Summary: JTES pile composite foundation is a new method for treating soft soil ground. Through vertical static load comparison tests, the load-settlement characteristics and load-transfer mechanism of JTES pile composite foundation were studied. The results showed that JTES pile composite foundation has higher ultimate bearing capacity and smaller settlement compared to other foundations.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Lihua Li, Langling Qin, Henglin Xiao, Zhi Hu, Guofang Xu, Qiang Ma
Summary: This study investigated the effect of particle sizes and sand contents on the mechanical behavior of recycled construction and demolition (C&D) materials. The results showed that adding an appropriate amount of sand can improve the particle gradation and maximum dry density of the materials, as well as increase the overall strength of the specimens.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Biochemical Research Methods
Guoping Li, Jing Chen, Qing Yang, Xuexin Yang, Penglong Wang, Haimin Lei, Ma Mi, Qiang Ma
Summary: A method was developed to analyze the chemical constituents of pomegranate seeds, which led to the identification of 59 compounds. These findings provide a reference for the pharmacodynamic substance research of pomegranate seeds and reveal their potential nutritional and therapeutic applications in the future.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2023)
Review
Chemistry, Physical
Tao Wang, Jiarui He, Xin-Bing Cheng, Jian Zhu, Bingan Lu, Yuping Wu
Summary: This review summarizes the research on lithium-sulfur batteries with high sulfur loading based on adsorption-catalysis dual promotion strategies. It covers the principle, technical challenges, electrode materials design, potential approaches, and suggestions for constructing next-generation lithium-sulfur batteries.
ACS ENERGY LETTERS
(2023)
Article
Biochemical Research Methods
Yuhan Shang, Xianshuang Meng, Juan Liu, Naining Song, Hongyan Zheng, Chao Han, Qiang Ma
Summary: Mass spectrometry (MS) is widely utilized in cosmetic analysis for various purposes including ingredient screening, quality control, risk monitoring, authenticity verification, and efficacy evaluation. This article provides an overview of the role of MS in cosmetic analysis over the past two decades, highlighting the sample preparation methods, ionization techniques, and mass analyzer types commonly employed in this field. Additionally, the article briefly discusses the future development of MS for cosmetic analysis.
JOURNAL OF CHROMATOGRAPHY A
(2023)
Article
Biochemistry & Molecular Biology
Sha Fu, Xuanzhi Xie, Xiaoyi Huangyang, Longxi Yang, Xianxiang Zeng, Qiang Ma, Xiongwei Wu, Mingtao Xiao, Yuping Wu
Summary: Highly safe and stable lithium metal batteries with high energy density are in urgent need. The key to achieving stable battery cycling is to design novel nonflammable electrolytes with superior interface compatibility and stability. In this study, dimethyl allyl-phosphate and fluoroethylene carbonate were added to triethyl phosphate electrolytes as functional additives to stabilize the deposition of metallic lithium and enhance the electrode-electrolyte interface. The designed electrolyte exhibits high thermostability and flame-retarding characteristics compared to traditional carbonate electrolyte. Li| |Li symmetrical batteries with the designed phosphonic-based electrolytes show excellent cycling stability of 700 hours at 0.2 mA cm(-2), 0.2 mAh cm(-2). Additionally, the electrolytes demonstrate better interface compatibility with metallic lithium anodes, as observed from the smooth and dense-deposited morphology on the cycled Li anode surface.
Article
Chemistry, Physical
Qiang Ma, Sha Fu, An-Jun Wu, Qi Deng, Wei-Dong Li, Dan Yue, Bing Zhang, Xiong-Wei Wu, Zhen-Ling Wang, Yu-Guo Guo
Summary: Bidirectionally functional polymer electrolytes (BDFPE) were designed to simultaneously handle the interface issues faced by anodes and cathodes. By constructing the BDFPE, a smooth and dendrite-free lithium deposition is enabled for Li||Li symmetry cells, and Li||LiNi0.6Co0.2Mn0.2O2 batteries demonstrate favorable cycling and rate capability with a stable CEI layer. The study provides a promising design strategy for high energy density lithium metal batteries.
ADVANCED ENERGY MATERIALS
(2023)
Review
Electrochemistry
Zhongfeng Tang, Dandan Feng, Yali Xu, Lei Chen, Xiangdan Zhang, Qiang Ma
Summary: Layered lithium transition metal oxides LiTMO2 (TM = Ni, Co, Mn, Al, etc.) are highly promising cathode materials for lithium-ion batteries, but the thermal instability of nickel-based cathode materials poses a safety concern for their further application in electric vehicles and energy storage power stations. Side reactions with the electrolyte, oxygen release during structural phase transition, and microcrack propagation due to weak spherical secondary particles are the main reasons for this issue. Various strategies, including element doping, surface engineering, nanostructure design, and particle mono-crystallization, have been explored to improve the thermal stability. This review summarizes the progress made in this field and provides insights into the origin of thermal instability, with the aim of accelerating the development of high-safety layered TM oxides.
Article
Biochemical Research Methods
Tiantian Zhang, Xiwen Ye, Xin Luo, Zengyuan Niu, Huiyong Wang, Qiang Ma
Summary: The study developed a solvent-free pyrolysis gas chromatography-mass spectrometry method to screen for multiple restricted additives in polymer materials. The method successfully screened 33 restricted substances simultaneously, and verified the sensitivity, linear range, and recovery of the method. It also validated the method using various reference materials and applied it to analyze plastic products and recycled plastic samples. The method provided a comprehensive and thorough inspection without sample pretreatment, offering numerous advantages over traditional methods.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Yueguang Lv, Yuhan Shang, Linsen Li, Ying Zhang, Qiang Ma
Summary: An integrated experimental protocol combining in-capillary aptamer-functionalized solid-phase microextraction (SPME), extraction nanoelectrospray ionization (nanoESI), and miniature MS analysis was developed for direct mass spectrometry (MS) analysis of complex samples. The method was successfully applied to analyze caffeine in electronic cigarette liquid and beverage samples, and demonstrated satisfactory analytical performance with high recoveries and low relative standard deviations.
Article
Nanoscience & Nanotechnology
Wangsheng Yuan, Ye Yuan, Junwei Wu, Chaolin You, Yishuang He, Xinhai Yuan, Qinghong Huang, Lili Liu, Lijun Fu, Yuping Wu
Summary: By constructing an Al-complexed artificial interfacial layer on the zinc surface, the wettability of the electrolyte is improved, side reactions are inhibited, and zinc-ion flux is regulated, resulting in long cycle life for aqueous zinc-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Chuan Tan, Wentao Wang, Yuping Wu, Yuhui Chen
Summary: Lithium-oxygen batteries face numerous challenges, including the controversy surrounding their discharge-charge cycling method and the reactivity of superoxide intermediates. This study investigated the influence of current density and electrode potential on side reactions and discharge products. The use of a flow cell setup helped identify more reactive intermediates in the surface route compared to the solution route.
FARADAY DISCUSSIONS
(2023)
Article
Chemistry, Multidisciplinary
Chaolin You, Ruoyu Wu, Xinhai Yuan, Lili Liu, Jilei Ye, Lijun Fu, Peng Han, Yuping Wu
Summary: This study presents a new method to address the freezing issue of aqueous electrolytes at low temperatures. By introducing formamide as a co-solvent and combining it with inexpensive zinc salt, an electrolyte with low freezing point and high ionic conductivity is achieved. Experimental results demonstrate excellent cycling stability and high Coulombic efficiency in this electrolyte.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Shuang Xia, Zhichao Chen, Lixuan Yuan, Jie Song, Qi Zhou, Xinhai Yuan, Lili Liu, Lijun Fu, Yuhui Chen, Yuping Wu
Summary: Li-S batteries have high energy density, but issues like the 'shuttle effect' and lithium dendrites hinder their commercialization. This study prepares modified separators to address these issues, promoting better cycling performance and stability. It offers a feasible solution for high-performance Li-S batteries in commercial applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
