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Energy & Environmental Materials 2023年第6期6卷 173-178页

作者： Litao Yan Yuyan Shao Wei Wang Pacific Northwest National Laboratory 902 Battelle BoulevardRichland WA 99354USA

The hydrogen-iron(HyFe)flow cell has great potential for long-duration energy storage by capitalizing on the advantages of both electrolyzers and flow ***,its operation at high current density(high power)and over continuous cycling testing has yet to be *** this article,we discuss our design and demonstration of a water-management strategy that supports high current and long-cycling performance of a HyFe flow *** molecules associated with the movement of protons from the iron electrode to the hydrogen electrode are sufficient to hydrate the membrane and electrode at a low current density of 100 mA cm^(-2)during the charge *** higher charge current density,more aggressive measures must be taken to counter back-diffusion driven by the acid concentration gradient between the iron and hydrogen *** water-management approach is based on water vapor feeding in the hydrogen electrode and water evaporation in the iron electrode,thus enabling high current density operation of 300 mA cm^(-2).

关键词： acid concentration gradient energy storage flow battery hydrogen longcycling performance water management

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Opportunities and challenges of organic flow battery for electrochemical energy storage technology

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Journal of Energy Chemistry 2022年第4期31卷 621-639页

作者： Ziming Zhao Changkun Zhang Xianfeng Li Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022JilinChina University of Science and Technology of China Hefei 230026AnhuiChina

For flow batteries(FBs), the current technologies are still expensive and have relatively low energy density, which limits their large-scale applications. Organic FBs(OFBs) which employ organic molecules as redox-active materials have been considered as one of the promising technologies for achieving lowcost and high-performance. Herein, we present a critical overview of the progress on the OFBs, including the design principles of key components(redox-active molecules, membranes, and electrodes) and the latest achievement in both aqueous and nonaqueous systems. Finally, future directions in explorations of the high-performance OFB for electrochemical energy storage are also highlighted.

关键词： Electrochemical energy storage flow battery Organic systems Organic redox-active molecules

Bromine-Graphite Intercalation Enabled Two-Electron Transfer for a Bromine-Based flow battery

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Transactions of Tianjin University 2022年第3期28卷 186-192页

作者： Yue Xu Congxin Xie Xianfeng Li Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Br_(2)/Br^(−)is a promising redox couple in fl ow batteries because of its high potential,solubility,and low ***,the reaction between Br^(−)and Br_(2)only involves a single-electron transfer process,which limits its energy ***,a novel two-electron transfer reaction based on Br^(−)/Br^(+) was studied and realized through Br^(+) intercalation into graphite to form a bromine-graphite intercalation compound(Br-GIC).Compared with the pristine Br^(−)/Br_(2)redox pair,the redox potential of Br intercalation/deintercalation in graphite is 0.5 V higher,which has the potential to substantially increase the energy *** erent from Br_(2)/Br^(−)in the electrolyte,the diff usion rate of Br intercalation in graphite decreases with increasing charge state because of the decreasing intercalation sites in graphite,and the integrity of the graphite structure is important for the intercalation *** a result,the battery can continuously run for more than 300 cycles with a Coulombic effi-ciency exceeding 97%and an energy effi ciency of approximately 80%at 30 mA/cm^(2),and the energy density increases by 65%compared with Br^(−)/Br_(2).Combined with double-electron transfer and a highly reversible electrochemical process,the Br intercalation redox couple demonstrates very promising prospects for stationary energy storage.

关键词： flow battery Two-electron transfer Bromine-graphite intercalation Bromine

Highly Conductive Proton Selectivity Membrane Enabled by Hollow Carbon Sieving Nanospheres for Energy Storage Devices

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Engineering 2023年第9期28卷 69-78页

作者： Kang Huang Shuhao Lin Yu Xia Yongsheng Xia Feiyan Mu Yuqin Lu Hongyan Cao Yixing Wang Weihong Xing Zhi Xu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Ion conductive membranes(ICMs)with highly conductive proton selectivity are of significant importance and greatly desired for energy storage ***,it is extremely challenging to construct fast proton-selective transport channels in ***,a membrane with highly conductive proton selectivity was fabricated by incorporating porous carbon sieving nanospheres with a hollow structure(HCSNs)in a polymer *** to the precise ion sieving ability of the microporous carbon shells and the fast proton transport through their accessible internal cavities,this advanced membrane presented a proton conductivity(0.084 S·cm^(-1))superior to those of a commercial Nation 212(N212)membrane(0.033S·cm^(-1))and a pure polymer membrane(0.049 S·cm^(-1)).The corresponding proton selectivity of the membrane(6.68×10^(5) S·min·cm^(-3))was found to be enhanced by about 5.9-fold and 4.3-fold,respectively,compared with those of the N212 membrane(1.13×10^(5) S·min·cm^(-3))and the pure membrane(1.56×10^(5) S·min·cm^(-3)).Low-field nuclear magnetic resonance(LF-NMR)clearly revealed the fast protonselective transport channels enabled by the HCSNs in the polymeric *** proposed membrane exhibited an outstanding energy efficiency(EE)of 84%and long-term stability over 1400 cycles with a0.065%capacity decay per cycle at 120 mA·cm^(-2) in a typical vanadium flow battery(VFB)system.

关键词： Ion conductive membrane Hollow carbon sieving nanosphere Proton transport channel flow battery

Utilization of Energy Storage and Hydrogen in Power and Energy Systems:Viewpoints from Five Aspects

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 1-7页

作者： Yonghua Song Mohammad Shahidehpour Saifur Rahman Nigel Brandon Kai Strunz Jin Lin Yuxuan Zhao State Key Laboratory of Internet of Things for Smart City University of MacaoTaipaMacao 999078China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Galvin Center for Electricity Innovation Illinois Institute of TechnologyChicagoIL 60616USA Department of Advanced Research Institute Virginia Polytechnic Institute and State UniversityArlingtonVA 22203USA Department of Earth Science and Engineering Imperial College LondonLondon SW72AZU.K Department of Sustainable Electric Networks and Sources of Energy Technische Universitt Berlin10587 BerlinGermany State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Decarbonizing power systems is crucial to mitigating climate change impacts and achieving carbon *** renewable energy supply can reduce greenhouse gas emissions and accelerate the decarbonization ***,renewable energy sources(RESs)such as wind and solar power are characterized by intermittency and often non-dispatchability,significantly challenging their high-level integration into power *** storage is acknowledged as a vital indispensable solution for mitigating the intermittency of renewables such as wind and solar power and boosting the penetrations of *** the CSEE JPES Forum,five well-known experts were invited to give keynote speeches,and the participating experts and scholars had comprehensive exchanges and discussions on energy storage ***,the views on the design,control,performance,and applications of new energy storage technologies,such as the fuel cell vehicle,water electrolysis,and flow battery,in the coordination and operation of power and energy systems were *** experts also provided experience that could be used to develop energy storage for constructing and decarbonizing new power systems.

关键词： Electrolysis electric vehicle energy storage flow battery fuel cell electric vehicle hydrogen energy

Earth-abundant CuFeS_(2) nanocrystals@graphite felt electrode for high performance aqueous polysulfide/iodide redox flow batteries

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Chinese Journal of Structural Chemistry 2024年第1期43卷 16-23页

作者： Tsegaye Tadesse Tsega Jiantao Zai Chin Wei Lai Xin-hao Li Xuefeng Qian School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai200240China Nanotechnology and Catalysis Research Centre(NANOCAT) Institute for Advanced Studies(IAS)University of Malaya3rd FloorBlock A50603 Kuala LumpurMalaysia Key Laboratory of Green and High-end Utilization of Salt Lake Resources Chinese Academy of SciencesChina

Due to their high energy density and low price,aqueous polysulfide/iodide redox flow batteries are appealing for scalable energy ***,the greatest barrier to their practical uses is the low electrochemical kinetics of the redox reactions of polysulfide ions on graphite electrodes,which often limit their energy efficiency and power *** this study,the CuFeS_(2)nanomaterial was successfully synthesized through the hot injection method,and CuFeS_(2)nanomaterials were uniformly coated onto the surfaces and sandwiched into graphite felt(GF);this process can significantly boost the electrocatalytic activities of S^(2-)/S^(2-)_(x)redox reactions by improving the charge transfer process,which has been proven by the electrochemical measurement and density functional theory(DFT)*** polysulfide-iodide flow battery,with GF-CuFeS_(2)serving as the negative electrode,can achieve a high energy efficiency of 79.6%at 20 mA/cm^(2),a power density of 50.7 mW/cm^(2),and a stable energy efficiency retention of 87.0%after 180 cycles.

关键词： CuFeS_(2) Hot injection flow battery Nanomaterial DFT

Effects of Electrolyte Concentration, Temperature, flow Velocity and Current Density on Zn Deposit Morphology

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Journal of Energy and Power Engineering 2015年第11期9卷 1019-1028页

作者： Aleksandra Gavrilovic-Wohlmuther Andreas Laskos Christian Zelger Bernhard Gollas AdamHarding Whitehead CEST--Centre of Electrochemical Surface Technology GmbH Wiener Neustadt 2700 Austria Institute for Chemistry and Technology of Materials Graz University of Technology Graz 8010 Austria Cellstrom GmbH Wiener Neudorf 2355 Austria

The most critical disadvantages of the Zn-air flow battery system are corrosion of the zinc, which appears as a high self-discharge current density and a short cycle life due to the non-uniform, dendritic, zinc electrodeposition that can lead to internal short-circuit. In our efforts to find a dendrite-free Zn electrodeposition which can be utilized in the Zn-air flow battery, the surface morphology of the electrolytic Zn deposits on a polished polymer carbon composite anode in alkaline, additive-free solutions was studied. Experiments were carried out with 0.1 M, 0.2 M and 0.5 M zincate concentrations in 8 M KOH. The effects of different working conditions such as： elevated temperatures, different current densities and different flow velocities, on current efficiency and dendrite formation were investigated. Specially designed test flow-cell with a central transparent window was employed. The highest Coulombic efficiencies of 80%-93% were found for 0.5 M ZnO in 8 M KOH, at increased temperatures （50-70 ℃）, current densities of up to 100 ***2 and linear electrolyte flow velocities higher than 6.7 cm.s1.

关键词： Dendrite electrochemistry flow battery zinc zinc morphology.