Article
Chemistry, Multidisciplinary
Yaojie Lei, Can Wu, Xinxin Lu, Weibo Hua, Shaobo Li, Yaru Liang, Hanwen Liu, Wei-Hong Lai, Qinfeng Gu, Xiaolan Cai, Nana Wang, Yun-Xiao Wang, Shu-Lei Chou, Hua-Kun Liu, Guoxiu Wang, Shi-Xue Dou
Summary: It is crucial to regulate S activity dynamically for efficient and stable room-temperature sodium-sulfur (RT/Na-S) batteries. In this study, cobalt sulfide is used as an electron reservoir to enhance the activity of sulfur cathodes, and cobalt single atoms serve as double-end binding sites for stable S conversion. The rational construction of CoS2 electron reservoir enables the direct reduction of S to short-chain sodium polysulfides (Na2S4) through a streamlined redox path. Cobalt single atoms synergistically work with the electron reservoir to reinforce the streamlined redox path, immobilize in situ formed long-chain products, and catalyze their conversion, leading to high S utilization and sustainable cycling stability. The developed sulfur cathodes exhibit superior rate performance and high cycling capacity retention.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Physical
Hanwen Liu, Wei-Hong Lai, Yaojie Lei, Huiling Yang, Nana Wang, Shulei Chou, Hua Kun Liu, Shi Xue Dou, Yun-Xiao Wang
Summary: Sodium-sulfur batteries hold great potential for rechargeable batteries due to their low cost, abundant resources, and high energy density. While significant progress has been made in the development of electrodes, there is a lack of understanding regarding the impacts of different electrolytes on electrode interfaces and overall battery mechanisms. This review comprehensively discusses multiple kinds of electrolytes and the interfaces between electrolytes and electrodes in room-temperature sodium-sulfur batteries, and presents challenges and recent progress in sulfur electrochemical mechanisms and future prospects for electrolyte optimization, cathode and anode improvement, and interfacial enhancement.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yanxia Wang, Yangyang Lai, Jun Chu, Zichao Yan, Yun-Xiao Wang, Shu-Lei Chou, Hua-Kun Liu, Shi Xue Dou, Xinping Ai, Hanxi Yang, Yuliang Cao
Summary: Researchers have successfully addressed the sluggish kinetics of the sulfur redox reactions in room-temperature sodium-sulfur batteries by fabricating an elaborate multifunctional architecture, with MoS2 playing a key catalytic role.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Bo Hu, Hongbin Li, Hao Fan, Jiangxuan Song
Summary: We report a high-volumetric-capacity and long-lifetime aqueous organic redox flow battery (AORFB) anolyte based on a six-electron transfer pi-conjugated heteroaromatic hexaazatrinaphthalene tricarboxylic acid (HATNTA). HATNTA undergoes a reversible three-step six-electron redox process at pH=14. The HATNTA-based AORFB exhibits high open-circuit voltage, impressive specific capacity, high output power density, and superior cycling stability.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Physical
Xiaowei Wang, Wei Tang, Kian Ping Loh
Summary: By molecular engineering of aqueous irreversible triphenylamine (TPA), a reversible two-electron transfer system based on an enol/keto redox couple with high kinetic rate constant was obtained. This system can achieve high working voltage and good cycling performance in aqueous RFBs.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Electrochemistry
Vikram Singh, Seongmo Ahn, Hye Ryung Byon
Summary: This study presents a solution for achieving stable two-electron transfer in aqueous organic redox flow batteries by improving the solubility of organic molecules.
BATTERIES & SUPERCAPS
(2022)
Article
Electrochemistry
Nicolas Daub, Koen H. Hendriks, Rene A. J. Janssen
Summary: TTF derivatives exhibit excellent cycling stability and high Coulombic efficiency as catholytes for nonaqueous organic redox flow batteries.
BATTERIES & SUPERCAPS
(2022)
Review
Electrochemistry
Jae-Hyuk Park, In-Hwan Ko, Jaewoon Lee, Sangeon Park, Duho Kim, Seung-Ho Yu, Yung-Eun Sung
Summary: Anionic redox chemistry has emerged as a way to increase the energy density of rechargeable batteries, but issues such as irreversible structural disorder and voltage fading due to oxygen release are major obstacles. Understanding the connection between structural stability and anionic redox activity is essential for overcoming these limitations. Factors such as stacking sequences and cationic vacancies can influence the reversible capacity originating from anionic redox.
Article
Chemistry, Physical
J. Landon Tyler, Robert L. Sacci, Michelle L. Lehmann, Guang Yang, Thomas A. Zawodzinski, Jagjit Nanda
Summary: Sodium-exchanged Nafion membranes are effective in inhibiting polysulfide crossover in redox flow batteries, significantly improving capacity retention and Coulombic efficiencies. Commercial porous membranes show high polysulfide crossover, leading to lower performance after cycles. Electrochemical impedance spectroscopy highlights the characteristics of different membranes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Zhipeng Yang, Zongjie Hu, Gaojie Yan, Mengke Li, Yi Feng, Xiongwei Qu, Xiaojie Zhang
Summary: The synthesized HUT-8 material can efficiently adsorb and catalytically capture/diffuse LiPSs, as well as promote the precipitation/decomposition of Li2S, demonstrating excellent cycling stability and high capacity characteristics in Li-S batteries.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Indra Narayan Chakraborty, Pradyut Roy, Pramod P. P. Pillai
Summary: The effectiveness of quantum dots (QDs) in photocatalyzing organic reactions is explored in this study. The use of QDs in efficiently catalyzing olefination reactions under visible-light irradiation at room temperature is demonstrated. Spectroscopic and electrochemical studies provide insights on the charge transfer mechanism involved in QD-photocatalyzed olefination.
Article
Chemistry, Multidisciplinary
Yichao Yan, David B. Vogt, Thomas P. Vaid, Matthew S. Sigman, Melanie S. Sanford
Summary: A diaminocyclopropenium-phenothiazine hybrid catholyte was designed for non-aqueous redox flow batteries, demonstrating stable two-electron cycling and high solubility in all oxidation states. This catholyte exhibited >90% capacity retention over 266 hours of flow cell cycling at >0.5 M electron concentration in a high energy density two-electron RFB.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Mohammad M. Bahzad, Doug Aaron, Kenneth D. Kihm, Seungha Shin, Umar Saeed, Yu-Kai Weng
Summary: Voltage losses during discharge in a biphenyl|sodium-polysulfide organic redox flow battery were quantitatively investigated. It was found that kinetic overpotential dominated the voltage losses at both the anode and cathode during discharge. The study also extended the understanding of high-frequency impedance features of the cathode, which was relatively less explored in the literature. The lower exchange current density of Bp compared to Na2Sx explained the higher kinetic voltage loss of Bp.
JOURNAL OF POWER SOURCES
(2023)
Article
Biochemistry & Molecular Biology
Michael Lienemann
Summary: Recent advancements in enzymatic electrosynthesis using renewable energy sources and specific catalysts have generated interest. However, the development of these processes is hindered by a lack of understanding of the molecular mechanisms involved. Studying non-electrosynthetic electron transferring proteins can provide insight into how redox proteins control and transfer electrons efficiently. This understanding can lay the foundation for further studies on the structural biology of enzymatic electrosynthesis.
COMPUTATIONAL AND STRUCTURAL BIOTECHNOLOGY JOURNAL
(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
Electrochemistry
Karan Sahni, Maziar Ashuri, Qianran He, Ritu Sahore, Ira D. Bloom, Yuzi Liu, James A. Kaduk, Leon L. Shaw
ELECTROCHIMICA ACTA
(2019)
Article
Engineering, Environmental
Zhao Ding, Hao Li, Leon Shaw
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Jialiang Wei, Leon Shaw, Wei Chen
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Zhao Ding, Zhiqian Chen, Tianyi Ma, Chang-Tien Lu, Wenhui Ma, Leon Shaw
ENERGY STORAGE MATERIALS
(2020)
Article
Chemistry, Physical
Mei Luo, Angel L. Ortiz, Leon L. Shaw
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Qianran He, Maziar Ashuri, Yuzi Liu, Bingyu Liu, Leon Shaw
Summary: A scalable synthesis method for high-performance silicon microreactors has been developed, which can achieve high specific capacity, ultrafast charge/discharge, high initial Coulombic efficiency, and long cycle life simultaneously. The silicon microreactors, created by high-energy ball milling, contain nanochannel voids that accommodate volume expansion and provide fast Li-ion diffusion pathways.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Mei Luo, Marco-Tulio F. Rodrigues, Leon L. Shaw, Daniel P. Abraham
Summary: The n:p ratio is crucial for lithium-ion cell design and performance. Higher n:p ratio leads to better reversibility, capacity retention, and lower impedance rise due to smaller volume changes in silicon particles during electrochemical cycling.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jialiang Wei, Leon Shaw, Wei Chen
Summary: In this study, a comparative first-principles investigation was conducted to understand the relationship between structural changes and Cr migration in layered O3 and hybrid-phased NaCrO2. The results show that after Cr migration, the hybrid-phased NaCrO2 undergoes greater layer shrinkage compared to the O3 phase. The concentration of Na, local 3D configurations, and 2D in-plane geometries were found to affect the Cr migration energy, and a more uniform distribution of the Cr-O bond lengths suggests suppressed Cr migration in doped NaCrO2. This comparative study highlights the significance of hybrid-phased structures in the development of layered cathode materials.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Electrochemistry
Haobin Huo, Sivaviswa Radhakrishnan, Leon L. Shaw, Karoly Nemeth
Summary: Recently, several effective methods have been developed to achieve simultaneous high energy and high power density in Lithium - carbon fluoride (Li-CFx) batteries. Through ingenious nano-architecture design, controlled porosity, boron doping, and electrolyte additives, these methods can achieve energy density as high as 1000 Wh/kg at a power density of 60-70 kW/kg in coin cells and 750 Wh/kg at a power density of 12.5 kW/kg in pouch cells. This study demonstrates that by using a polyacrylonitrile binder and a LiBF4 electrolyte in Li-graphite fluoride coin cells, a similar great performance can be achieved, with an energy density of 931 Wh/kg at a power density of 59 kW/kg. The observed effect is proposed to be the result of the electro-catalytic effect of the polyacrylonitrile binder.
Article
Chemistry, Physical
Changlong Chen, Hao Lin, Bingyu Liu, Leon Shaw
Summary: Na-ion battery is a promising battery chemistry for the future generation after Li-ion batteries. This study combines Na metal labeling and relaxation time analysis to investigate the electrode kinetics of Na-ion batteries. By utilizing an equivalent circuit model, the performance-limiting kinetics of Na/NaCrO2 cells with different electrolytes are identified. Based on the sluggish interference generated with ester-based electrolyte, ether-based electrolytes are recommended for future studies of Na-ion battery materials.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Zhepu Shi, Ziyong Wang, Leon L. Shaw
Summary: NaCrO2 is a promising cathode material for Na-ion batteries, but further studies are needed to understand its specific capacities and cycle stability. The low electronic conductivity at the electrode/electrolyte interface controls its specific capacity. Uniform carbon coating can enhance the specific capacity, but it does not improve the cycle stability. Future directions include integrating carbon coating and doping to enhance the long-term cycle stability of NaCrO2.
Review
Metallurgy & Metallurgical Engineering
Zhao Ding, Yuting Li, Hang Yang, Yangfan Lu, Jun Tan, Jianbo Li, Qian Li, Yu'an Chen, Leon L. Shaw, Fusheng Pan
Summary: Hydrogen energy is considered the ultimate power source in the 21st century. Tailoring the stable thermodynamics and sluggish kinetics of hydrogen storage in magnesium-based solid-state materials through nanoengineering and catalysis is crucial for their industrialization and application.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Electrochemistry
Andressa Y. R. Prado, Marco-Tulio F. Rodrigues, Stephen E. Trask, Leon Shaw, Daniel P. Abraham
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Article
Chemistry, Multidisciplinary
Zhao Ding, Hao Li, Ge Yan, Weijie Yang, Zhengyang Gao, Wenhui Ma, Leon Shaw
CHEMICAL COMMUNICATIONS
(2020)
Article
Chemistry, Analytical
Maziar Ashuri, Qianran He, Leon L. Shaw
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2020)