JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Yanjiao Ma,Naeem Akhtar Qaisrani,Lingling Ma,Panyue Li,Lv Li,Shoutao Gong,Fengxiang Zhang,Gaohong He
A side-chain hydrolysis method is proposed for fabricating high performance nanoporous membranes that can be used in vanadium flow batteries (VFBs). The membranes were fabricated facilely by hydrolyzing the bulky ester groups at the side chain of a cross-linked copolymer . Such hydrolysis creates pores that function as the pathway for proton transport while the cross-links can minimize membrane swelling induced by the hydrolysis derived carboxylic acid groups. The cross-links also contain cations so that vanadium permeation can be suppressed via Donnan repulsion effect. Therefore, the fabricated membrane combines the benefits of ionic and porous membranes, and thus can balance proton conduction and the vanadium ion restriction, giving rise to a good performance in a VFB. The optimized VFB showed a coulombic efficiency of 97.3% and an energy efficiency of 82.7% at 80 mA cm −2 for 100 cycles. Our work provides a facile, novel and cost-effective method to fabricate high-performance membranes for VFB applications.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Qiang Jiang,Yu Shi,Yichao An,Liang Zhang,Jun Li,Xun Zhu,Qiang Liao
The all-aqueous thermally regenerative battery has the advantages of high open-circuit voltage, high power density, and high Coulombic efficiency, providing a promising way for low-temperature waste heat recovery. In this study, a passive membraneless thermally regenerative flow battery driven by capillary force and gravity is proposed to reduce the cost of construction and operation. The feasibility of power generation and the influence of key parameters (height difference, support electrolyte concentration, etc.) on the battery performance are studied. The results showed that a laminar flow induced by a fiber-based microfluidic reactor could effectively separate the catholytes and anolytes, and the battery could achieve long-term power production and obtain a maximum power density of 15.2 mW cm–2. The performance of the battery first increased and then decreased with the inlet height, and the optimal height was 3 mm. This is mainly due to the fact that the inlet height affects the flow rate of the electrolyte, which affects the mass transfer and laminar flow effect in the porous electrode. Within a certain range, as the concentration of the supporting electrolyte increases, the conductivity of the electrolyte is significantly improved, although the flow rate decreases to a certain extent due to the increase in viscosity, resulting in a further improvement in the battery performance. Through the above optimization, the maximum power density of the battery obtained in this study is 24.9 mW cm–2, and the maximum theoretical thermal efficiency can reach 1.26% (the relative Carnot efficiency can reach 10.6%).
研究领域:
能源科学
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环境工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yating Wu,Lei Zhou,Yangyang Xie,Yaobin Lai,Shangwan Fu,Xingchen Kang,Wenhui Shi,Jian Li,Xuxia Zhang,Kang Hu,Hui Zhang,Tao Qi
Due to the superiority of decoupled energy and power, high safety, and design flexibility, redox flow batteries (RFBs) have gained much attention as candidates for large-scale electrochemical energy storage. However, the main redox flow batteries like iron-chromium or all-vanadium flow batteries have the dilemma of low voltage and toxic active elements. In this study, a green Eu-Ce acidic aqueous liquid flow battery with high voltage and non-toxic characteristics is reported. The Eu-Ce RFB has an ultrahigh single cell voltage of 1.96 V. The high concentration of electrolyte enables the full-cell energy density to reach 43 Wh/L. Even at the current density of 100 mA cm −2 over 100 cycles, the average coulombic efficiency, voltage efficiency and energy efficiency can reach 98 %, 84 %, and 82.4 %, respectively. In comparison with other reported representative redox flow batteries in recent years, the practical power density calculated at 80 % energy efficiency is at a leading level. These demonstrate the Eu-Ce RFB is a promising solution for green large-scale renewable energy storage.
研究领域:
电化学
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储能技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 43
·期 9
·4473-4482
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IF 3.343
Dixuan Cheng,Gang Cheng,Zhangxing He,Lei Dai,Ling Wang
Summary In this paper, titanium dioxide (TiO 2 ) nanoparticles were employed as catalysts towards V 2+ /V 3+ redox couple of vanadium redox flow battery (VRFB). The effect of TiO 2 phase on the electrocatalytic performance for negative couple was systematically investigated. The electrochemical properties of TiO 2 with different phase were assessed via cyclic voltammetry and electrochemical impedance spectroscopy by using AB as conductive agent. Obtained from the results, anatase TiO 2 (α-TiO 2 ) exhibits superior electrocatalytic activity to rutile TiO 2 (γ-TiO 2 ). The VRFB cell performs well at discharge capacity, voltage efficiency, and energy efficiency by employing α-TiO 2 -modified negative electrode with current density varying between 50 and 100 mA cm −2 . The discharge capacity of α-TiO 2 -modified cell with vanadium ion concentration of 1.6 M comes up to 113.5 mA h at 100 mA cm −2 current density, which is increased by 39.1 mA h after modification for negative electrode. Moreover, the corresponding energy efficiency increases by 7.5% after modification of α-TiO 2 . Experimental results show that TiO 2 is an ideal catalyst for VRFB. Moreover, α-TiO 2 demonstrates superior electrocatalytic performance to γ-TiO 2 towards V 2+ /V 3+ reaction.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 61
·56399-56405
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IF 3.289
Zhaolin Na,Fei Liang,Dongming Yin,Limin Wang
Bi3+ ions are introduced into the lead electrolyte of lead-based redox flow batteries (RFBs), and their influence on the electrochemical performance of the redox cell is thoroughly investigated. The metallic Bi particles, which are simultaneously electrodeposited onto the electrode surface during the charge process of the RFBs, significantly improve the electrochemical performance of lead-based RFBs by enhancing the activity and reversibility of the sluggish Pb(II)/Pb(0) redox reaction and suppressing hydrogen evolution. The cell using a negative electrolyte with Bi3+ ions exhibits considerable enhancement both in the columbic efficiency (CE) and voltage efficiency (VE), and therefore in the energy efficiency (EE). Moreover, a mechanism accounting for the role that Bi particles play in the redox reactions in this lead half-cell is proposed. Bi particles favor the formation of a BiHx compound, an intermediate that reduces Pb(II) to Pb(0), and thereby curbs the competitive side reaction of hydrogen evolution responsible for the major loss for the CE. Additionally, the morphology of lead electrodeposition is also presented and the deposits become more uniform and smooth without any dendrites upon the addition of Bi3+. The results suggest that the utilization of non-noble Bi as a high-performance additive promises to be applicable to lead-based RFBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Yang Zhao,Lihong Yu,Xinping Qiu,Jingyu Xi
It is essential to boost the catalytic activity and cycling stability of the electrode for the ultra-long-term operation of vanadium flow battery (VFB). Herein, we report a novel hierarchical electrode by coating carbon spheres on the graphite felt (CS/GF) employing silicon dioxide nanospheres as templates and phenol formaldehyde resin as carbon sources. CS/GF possess larger surface areas and more defects than the thermally activated graphite felt, leading to better wettability and more active sites. As a result, the electrochemical activity and kinetic reversibility of the CS/GF electrode toward the VO 2 + /VO 2+ and V 3+ /V 2+ redox couples are promoted. Meanwhile, the novel carbon layer-confined structure ensures the superior durability of the CS/GF electrode during the ultra-long-term cycling test. The VFB assembled with CS/GF electrode exhibits outstanding rate performance at current densities of 50–300 mA cm −2 as well as excellent stability over 5000 charge-discharge cycles at a high current density of 150 mA cm −2 . The facile method in this work provides a new idea for developing efficient and durable VFB electrodes.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Yihan Zhen,Cuijuan Zhang,Yongdan Li
Nonaqueous redox flow batteries (NARFBs) have promise for large-scale energy storage with high energy density. Developing advanced active materials is of paramount importance to achieve high stability and energy density. Herein, we adopt the molecular engineering strategy by coupling tetraalkylammonium and an ethylene glycol ether side chain to design anthraquinone-based ionic active species. By adjusting the length of the ethylene glycol ether chain, an ionic active species 2-((9,10-dioxo-9,10-dihydroanthracen-1-yl)amino)-N-(2-(2-methoxyethoxy)ethyl)-(N,N-dimethylethan-1-aminium)-bis(trifluoromethylsulfonyl)imide (AQEG2TFSI) with high solubility and stability is obtained. Paired with a FcNTFSI cathode, the full battery provides an impressive cycling performance with discharge capacity retentions of 99.96% and 99.74% per cycle over 100 cycles with 0.1 and 0.4 M AQEG2TFSI, respectively.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Shiju Cai,Chenyi Wang,Jiafeng Qian,Zhengwang Tao,Jian Li
A series of aromatic proton exchange membranes (PAES-4S-xx) with tetrasulfonated side alkyl chains in repeated structural units are conveniently prepared by two-step reaction using 3,3′-(3″-aminophenyl)-4,4′-difluorodiphenylsulfone (2NH 2 -DFDPS), 4,4′-difluoro-diphenylsulfone, 4,4′-dihydroxybiphenyl and sodium 2-bromoethyl sulfonate as starting materials. Their chemical structure and physical properties are systematically studied. The incorporation of locally dense flexible side alkyl chains effectively endows the obtained ionic membranes based on PAES-4S-xx with high proton conductivity and moderate water uptake and swelling ratio. The corresponding values are between 38 and 98 mS/cm, 10 %–26 % and 6 %–18 % (30 °C), respectively, which increases with the increase of sulfonic acid content. In VRFB tests, the coulomb efficiency (CE) and energy efficiency (EE) of a single battery based on PAES-4S-24 membrane reach 95.8 % and 86.6 % at current density of 40 mA/cm 2 , respectively, higher than that of the single battery assembled by Nafion 115 (CE:90.7 %, EE:81.5 %). In addition, the single battery based on PAES-4S-24 also shows good stable performance during cyclic charging and discharging.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 46
·24510-24518
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IF 14.511
Bo Pang,Zihao Fan,Wanting Chen,Xiaoming Yan,Ruohan Du,Xiaozhou Wang,Xuemei Wu,Fujun Cui,Minggang Guo,Gaohong He
Interconnective sieving pores are fabricated by the hydrolysis of ionic clusters in precursor ion-conductive membranes to provide a versatile strategy for the proton transport-ion selectivity trade-off in vanadium flow batteries. The sulfate ester group has higher acidity than the well-formed hydrophilic ionic clusters in the precursor dense membrane and converts into smaller hydroxyl groups by subsequent hydrolysis, producing numerous angstrom-scale pores (4–8 Å) as independent H+/Vn+ ion sieving units. Meanwhile, the collapse of electrostatic interactions between the precursor sulfate ester groups and the membrane swelling during hydrolysis induced interconnection of the hydrated ionic clusters; therefore, the converted hydroxyl groups tend to disperse in the hydrophilic domains to form the interconnected collection of numerous sieving pores as broad proton conductive channels. By tuning the porous morphology by ion exchange capacity, excellent cell performance is achieved (high energy efficiency of 85.8%, low discharge capacity decay of 0.22% per cycle, and stable operation of 1000 charge–discharge cycles at 100 mA cm−2), which is better than that of Nafion 212 and most contemporary porous membranes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yihan Zhen,Cuijuan Zhang,Yongdan Li
The non-aqueous redox flow battery (NARFB) is a very promising technology for the grid-scale energy storage; however, its wide application is seriously limited by the cycling stability. Here, we designed a ferrocene derivative by imidazole-functionalization and grafting an oligoether chain, 1-ferrocenylmethyl-3-(2-(2-(2-methoxyethoxy)ethoxy)ethyl) imidazolium-bis(trifluoromethylsulfonyl)imide (FcMITEGTFSI). The imidazolium cationic group induces a positive shift in the redox potential of the ferrocene core whilst ensuring the stability of the active species; the flexible oligoether side chain renders the molecule a liquid at room temperature (25 °C) and miscible with acetonitrile solvent. The flow battery shows robust cycling stability, with an overall discharge capacity retention of ≈95.5% after 200 cycles, corresponding to a capacity retention of ≈99.98% per cycle at 25 mA cm −2 with 0.1 M electrolyte.
研究领域:
能源存储技术
·
电化学材料
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 9
·4273-4282
·
IF 2.961
Gao Jiayi,Yang Yujie,Ren Yujie,Zhu Wenjie,Li Jin,Liu Yongguang,Dai Lei,Wang Ling,He Zhangxing
Vanadium redox flow batteries have the advantages of long life, flexible design, safety, and reliability, so they have broad development prospects in the field of energy storage. Borides are extensively used in electrochemistry due to their excellent electrical conductivity. In this program, HfB 2 was used as catalyst for the V 3+ /V 2+ pair. The catalytic effect was verified by electrochemical impedance spectroscopy and cyclic voltammetry. The result shows that the cell using HfB 2 as negative catalyst can exhibit excellent rate capability when the current density is 50 ~ 125 mA cm −2 . At 125 mA cm −2 , the discharge capacity of the modified cell is 68.7 mA h, which is much higher than pristine cell (22.8 mA h). And the energy efficiency of pristine cells is 11.2% lower than that of modified cells. These consequences suggest that HfB 2 is a catalyst with promising prospects to enhance electrochemical activity of V 3+ /V 2+ redox reaction in VRFB.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Green Energy and Intelligent Transportation
·
2024
·
IF 0
Yingchun Niu,Senwei Zeng,Guangfu Wu,Qingtan Gao,Ruichen Zhou,Chuanyuan Li,Yang Zhou,Quan Xu
Iron-chromium redox flow battery (ICRFB) is an electrochemical energy storage technology that plays a vital role in dealing with the problems of discontinuity and instability of massive new energy generation and improving the acceptance capacity of the power grid. Carbon cloth electrode (CC) is the main site where the electrochemical reaction occurs, which always suffers from the disadvantages of poor electrochemical reactivity. A new N-B co-doped co-regulation Ti composite CC electrode (T-B-CC) is firstly generated and applied to ICRFB, where the REDOX reaction can be promoted significantly owing to the plentiful active sites generated on the modified electrode. As contrasted with ICRFB with normal CC electrode, after 50 battery charge/discharge cycles， the discharge capacity (1990.3 mA· h vs 1155.8 mA·h) and electrolyte utilization (61.88% vs 35.94%) of ICRFB with CC electrode (T-B-CC) are significantly improved. Furthermore, the energy efficiency (EE) is maintained at about 82.7% under 50 cycles, which is 9.3% higher than that of the pristine electrically assembled cells. The co-modulation of heteroatom doping and the introduction of Ti catalysts is a simple and easy method to improve the dynamics of the Cr 3+ /Cr 2+ and Fe 3+ /Fe 2+ reactions, enhancing the performance of ICRFBs.
研究领域:
电化学
·
能源存储
·
材料科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）