JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Xiaoyang Jia,Zhongrui Lu,Kai Huai,Xiancan Yuan,Zhuoran Yang,Rui Huang,Shaoxiong Zhai,Qing Ye,Zhanfeng Deng,Jun Lin,Shaojian He
Covalent organic frameworks (COFs) are highly porous crystalline polymers with well-defined pore structures, exhibiting great potential for the use of composite membranes to separate ions with different sizes. However, COFs are mostly insoluble and poorly dispersed in common solvents, making it very difficult to well disperse COFs in polymer matrix to prepare high-quality composite membranes. In this work, a MS hybrid was prepared by in-situ growing COFs on the surface of Ti 3 C 2 T x MXenes, which helps improve the filler-matrix compatibility significantly. The synergetic effect of the two-dimensional structure of MXene nanosheets and the porosity of COF components in MS contributes to the improvement for the ion selectivity of the composite membranes (SPEEK/MS). The vanadium flow battery (VFB) loaded with the SPEEK/MS-10 membrane achieves the energy efficiency of 93 % at 40 mA cm −2 , as compared to 86 % for that with the SPEEK control membrane. Moreover, the improved cycling stability and capacity retention was achieved for the SPEEK/MS-10 based VFB. Therefore, this work provides a promising strategy to fabricate high-performance COF-based composite PEMs for the VFB applications.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Fuyu Chen,Zhongjie Wang,Xuhong Yin,Xiangdong Cheng,Qiang He,Hui Chen,Qinfang Zhang
The vanadium flow battery (VFB) has garnered significant attention for its potential to enable cost-effective utilization in large-scale energy storage. Nevertheless, the electrochemical activity of electrodes is limited during vanadium redox reactions, which poses a challenge to achieving high-performance VFBs. To address this, we synthesize a catalyst consisting of amorphous carbon, manganese oxide, and cobalt, to enhance VFB performance. Initially, bimetallic metal-organic frameworks with varying Mn Co ratios are synthesized using a hydrothermal method. Subsequently, the bimetallic metal-organic frameworks are carbonized to form the catalysts. The morphology, composition, electrocatalytic activity, and charging-discharging behavior of the prepared catalysts are then systematically investigated. This paper reveals that: i) the composite with a molar ratio of manganese to cobalt of 1:4, exhibits a uniform and fine particle distribution, an abundance of oxygen-containing functional groups, and exceptional electrochemical activities; ii) it enhances the energy efficiency of VFBs by 9 % compared to those utilizing raw carbon felts and by 5 % over those with mono-MnO@C or mono-Co@C electrodes at 100 mA cm −2 ; iii) it offers significant improvements in terms of operating voltages, cell capacities, high current density characteristics, and lifespan. Consequently, this work introduces a novel electrochemical catalyst for VFBs, enhancing their performance and broadening their potential applications.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Zhangxing He,Yingqiao Jiang,Wei Meng,Fengyun Jiang,Huizhu Zhou,Yuehua Li,Jing Zhu,Ling Wang,Lei Dai
In order to improve the electrochemical performance of the positive graphite felt electrode in vanadium flow redox battery, a novel method is developed to effectively modify the graphite felt by combination of etching of HF and oxidation of H 2 O 2 . After the etching of HF for the graphite felt at ambient temperature, abundant oxygen-containing functional groups were further introduced on the surface of graphite felt by hydrothermal treatment using H 2 O 2 as oxidant. Benefiting from the surface etching and introduction of functional groups, mass transfer and electrode process can be improved significantly on the surface of graphite felt. VO 2+ /VO 2 + redox reaction on the graphite felt modified by HF and H 2 O 2 jointly (denote: GF-HF/H 2 O 2 ) exhibits superior electrochemical kinetics in comparison with the graphite felt modified by single HF or H 2 O 2 treatment. The cell using GF-HF/H 2 O 2 as the positive electrode was assembled and its electrochemical properties were evaluated. The increase of energy efficiency of 4.1% for GF-HF/H 2 O 2 at a current density of 50 mA cm −2 was obtained compared with the pristine graphite felt. The cell using GF-HF/H 2 O 2 also demonstrated higher discharge capacity. Our study revealed that HF/H 2 O 2 treatment is an efficient method to enhance the electrochemical performance of graphite felt, further improving the comprehensive energy storage performance of the vanadium flow redox battery.
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
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
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IF 6.333
Yuyue Zhao,Zhizhang Yuan,Wenjing Lu,Xianfeng Li,Huamin Zhang
Porous membranes with different charge on the surface and internal pore walls are prepared via the solvent-responsive layer-by-layer (SR-LBL) method. The effect of charge on the transport properties of different ions through the membranes is investigated in detail. The charge property of prepared membranes is tuned by assembling different charged polyelectrolytes (PEs) on the pore walls and the surface of the porous membranes. The results show that in a vanadium flow battery (VFB), the PE layers assembled on the surfaces (including pore walls) are capable to construct excellent ion transport channels to increase proton conductivity and to tune the ion selectivity via Donnan exclusion effect . Compared with the porous membrane with negative charges (7 bilayers), a VFB single cell assembled with a positively charged membrane (7.5 bilayers) yields a higher coulombic efficiency (98%). The water and ion transfer behavior exhibits a similar tendency. In the negative half-cell, the amount of V 3+ gradually increases as cycles proceed and the amount of V 2+ stays at a low and stable level. In the positive half-cell, the amount of VO 2+ decreases; while VO 2 + is accumulated. The imbalance of vanadium ions at both sides induces the discharge capacity fade.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Kaiyue Zhang,Bin Feng,Hong Wang,Lijie Liu,Liang Hu,Hui Zhao,Zeyu Xu,Xihao Zhang,Jianguo Liu
Vanadium flow batteries (VFBs) face critical challenges in power density due to sluggish redox kinetics and inefficient mass transport. Herein, we propose a dual-functional strategy that synergistically addresses both limitations through precursor morphology engineering. By precisely regulating hydrothermal crystallization kinetics, cobalt carbonate hydroxide (CCH) precursors evolve from 1D nanorods to 2D nanosheets, which transform into Co 3 O 4 nanoarrays after annealing while retaining structural features. The resulting 1D rod-like architectures create open mesoporous channels for rapid ion diffusion, while defective Co 3 O 4 surfaces enriched with oxygen vacancies enhance redox kinetics. DFT calculations reveal that oxygen vacancies upshift the Co d-band center in Co 3 O 4 , strengthening vanadium ion adsorption and accelerating redox reactions. Finite element analysis demonstrates that the rod-like microstructure enhances mass transport and reduces concentration polarization, while its uniform potential distribution suppresses parasitic side reactions. As a result, the VFB with Co 3 O 4 @CF-90 achieves a high energy efficiency of 74.4 % at 300 mA cm −2 , outperforming conventional carbon felt by 9.7 %, and maintains 80.2 % efficiency at 200 mA cm −2 over 400 cycles. This work establishes a scalable morphology-induced vacancy engineering paradigm for high-performance flow battery electrodes, decoupling catalytic and transport optimization through precursor design.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·762-771
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IF 12.732
Ziming Zhao,Qing Dai,Xiaofeng Li,Suobo Zhang,Shenghai Li,Xianfeng Li
Vanadium flow batteries (VFBs) are attracting increasing attention due to their promising prospect for large-scale energy storage. However, the high cost and low selectivity of current membranes limit their further application. In this work, a highly conductive (1122 mS cm−1) and stable microporous membrane was obtained via oxidizing a dense anion exchange membrane by an in situ or off situ process. Poly[(fluorene alkylene)-co-(biphenyl alkylene)] (PFBA-QA) with pendant quaternary ammonium alkyl groups was designed and prepared. The difference in stability between the main and side chains of the ether-free polymer allows the transformation of ion channels from aggregated ion clusters in the dense membrane to micropores by sacrificing the side chain in a strong oxidative environment. As a result, a VFB assembled with the resulting membrane demonstrates a CE of 97% and an EE of 88% at a current density of 80 mA cm−2, which can stably run for more than 290 cycles. This paper provides a new option for the membrane design in VFBs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2016
·Vol. 4
·期 33
·12955-12962
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IF 8.262
Zhizhang Yuan,Qing Dai,Yuyue Zhao,Wenjing Lu,Xianfeng Li,Huamin Zhang
Polypyrrole (PPY) modified porous poly(ether sulfone) (PPY/PES) membranes with excellent ion conductivity and high ion selectivity are prepared and employed in vanadium flow batteries (VFBs). The porous PES membranes are modified through in situ polymerization of pyrrole (PR) by using VO2+ as the oxidizing agent. The positively charged PPY nanoparticles can effectively retain vanadium ions via the Donnan exclusion and afford excellent ion conductivity through the interaction between the sulfuric acid in electrolytes and the nitrogen elements in PPY. As a consequence, the designed PPY/PES porous membranes demonstrate high ion selectivity and excellent ion conductivity along with exceptional chemical stability under VFB operation conditions. The PPY/PES porous membranes exhibited a very prospective performance for vanadium flow applications, showing a coulombic efficiency (CE) of 96.30% and an energy efficiency (EE) of 87.20% at a current density of 80 mA cm−2, which are much better than those of a VFB with a Nafion 115 membrane (coulombic efficiency of 93.16% and energy efficiency of 82.29%). Furthermore, a VFB using the PPY/PES porous membranes delivers a stable battery efficiency after continuously operating for more than 100 cycles, displaying good potential usage in 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
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 13
·6193-6199
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IF 8.867
Yuyue Zhao,Wenjing Lu,Zhizhang Yuan,Lin Qiao,Xianfeng Li,Huamin Zhang
Advanced charged porous membranes with flexible internal crosslinking networks were designed and fabricated for vanadium flow battery application. Flexible 1,4-diaminobutane was introduced in CMPSF spongy porous membranes to build flexible crosslinking networks on the pore walls. The flexible segments could induce relatively highly micro-phase separated structures (hydrophilic and hydrophobic phase) and effectively enhance the mobility of hydrophilic and hydrophobic domains, which is highly beneficial for proton transportation. At the same time, the positively charged crosslinking networks can ensure the high chemical stability of resulting membranes. As a result, porous membranes with flexible crosslinking networks could meet the requirement of VFB application owing to their excellent conductivity, high selectivity and high chemical stability. A VFB single cell with the prepared charged porous membrane exhibits a coulombic efficiency (CE) of more than 99% and an energy efficiency (EE) of about 87% at 80 mA cm−2, showing much higher performance than commercial Nafion 115 (CE = 92.5%, EE = 83.7%). A VFB employing the prepared membrane maintains a stable performance after more than 4000 charge–discharge cycles, showing impressive potential for VFB application.
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
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
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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
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
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
·
能源存储
✓ 已验证
产品关联
DOI
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
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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
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）