Electrochemical properties of Mg3MnNi2-x% polymethyl methacrylate-multiwalled carbon nanotubes (PMMA-MWCNTs) (x = 25, 50, 75, 100)

Chen, Qiuxia; Zhu, Yunfeng; Zhang, Yao; Liu, Yana; Zhang, Ji‐Guang; Liu, Zhibing; Chen, Wei; Li, Liquan

doi:10.1007/s10853-017-1961-1

Cited by 11 publications

(15 citation statements)

References 38 publications

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“…Even at a very high current density of 220 mA cm −2 , the EE can reach 80% which is the highest value ever reported for PBI membranes (Figure 6b,c). [16,[29][30][31][32][37][38][39][40][41][42][43] Benefiting from the very thin skin layer and highly porous support layer, all prepared membranes showed much better battery performance than that of a commercial Nafion115 (CE = 94.2% VE = 90.6% EE = 85.3%), confirming the very high ion conductivity and selectivity of prepared membrane.…”

Section: Resultsmentioning

confidence: 82%

“…It is indicative of the breakthrough of the trade-off between vanadium selectivity and proton conductivity, confirming the superiority of our membrane design. [16,[29][30][31][32][36][37][38][39][40][41][42] It is interesting to find that most of the dense PBI membranes possess low vanadium permeability but suffer from the high area resistance while most of the porous PBI membranes have low area resistance but is hard to have low vanadium permeability. Obviously, most other methods suffer from the trade-off issue.…”

Section: Resultsmentioning

confidence: 99%

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Membranes with Well‐Defined Selective Layer Regulated by Controlled Solvent Diffusion for High Power Density Flow Battery

Shi

Dai

et al. 2020

Advanced Energy Materials

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Membranes with precise control of selective layer are designed and prepared by adjusting diffusion of solvents. Combining experiments and theoretical calculations, the formation mechanism of ion conductive membranes prepared by a non‐solvent induced phase separation (NIPS) method is found to be related to internal diffusion flux of solvent to the non‐solvent bath and external diffusion flux of non‐solvent to the casting solution. By regulating the internal and external diffusion rates via a two‐step NIPS method, a series of polybenzimidazole (PBI) porous membranes with independently controlled thin selective skin layers and highly porous support layers are fabricated, which achieve a simultaneous improvement in ion selectivity and proton conductivity. A vanadium flow battery assembled with a PBI membrane demonstrates an energy efficiency of 80% at a current density of 220 mA cm−2, which is the highest value among the reported PBI membranes. This provides a simple and effective way to fabricate membranes with well‐defined morphologies.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Membranes with Well‐Defined Selective Layer Regulated by Controlled Solvent Diffusion for High Power Density Flow Battery

Shi

Dai

et al. 2020

Advanced Energy Materials

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“…Figure 10 demonstrates the X-ray diffraction spectra of PLGA/MWCNTs and PLGA nanofibers. Many studies in the literature [32,33] show that the diffraction peaks of carbon nanotubes mainly occur around 26°. As shown in Figure 10, the diffraction peaks of pure PLGA mainly occur at 21°, while the diffraction peaks of PLGA/MWCNTs are mainly at 21.5°.…”

Section: Resultsmentioning

confidence: 99%

Preparation of PLGA/MWCNT Composite Nanofibers by Airflow Bubble-Spinning and Their Characterization

Fang

Liu

et al. 2018

Polymers

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Poly(lactic-co-glycolic acid) (PLGA)/multi-walled carbon nanotube (MWCNT) composite nanofibers have been successfully fabricated via airflow bubble-spinning. In this work, a systematic study of the effects of solution concentration, relative humidity (RH), and composition on the morphology of PLGA nanofibers is reported. By comparing the distribution of fiber diameter, we found that the spinning effect was the best when the temperature was kept at 25 °C, the collecting distance 18 cm, the concentration 8 wt %, and the relative humidity 65%. MWCNTs used as added nanoparticles were incorporated into the PLGA nanofibers. The volatile solvents were used to achieve the purpose of producing nanoporous fibers. Besides, the rheological properties of solutions were studied and the PLGA or PLGA/MWCNT composite nanofibers with a nanoporous structure were also completely characterized using scanning electron microscope (SEM), a thermogravimetric analyzer(TGA), X-ray diffraction(XRD) and Fourier-transform infrared (FTIR) spectroscopy. In addition, we compared the mechanical properties of the fibers. It was found that the addition of MWCNTs significantly enhanced the tensile strength and elasticity of composite nanofibers without compromising the nanoporous morphology. The results showed that the breaking strength of the composite fiber bundle was three times as strong as the pure one, and the elongation at the break was twice as great. This work provided a novel technique successfully not only to get rid of the potential safety hazards caused by unexpected static but also prepare oriented nanoporous fibers, which would demonstrate an impressive prospect for the fields of adsorption and filtration.

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“…[75] The acid-base reactions in blend membrane reduced the hydrophilic domains, narrowed the water channels and restricted the vanadium permeation. Chen et al designed a high performance SPEEK/PBI membrane based on acid-base interactions.…”

Section: Microstructure Optimizationmentioning

confidence: 99%

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

Jiang

Xiang

et al. 2019

Advanced Sustainable Systems

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IntroductionWith the rapid increase of consumption of fossil fuels and the consequent environment pollution, there is an urgent need for the development and effective utilization of renewable energy sources like wind, solar, biomass, etc. However, these renewable energy sources are intermittent in nature, leading to the conflict between the seasonal and unstable electricity generation and requirement of the continuous and stable power supply for the end application. Thereby, energy storage Vanadium redox flow batteries (VRFBs) are regarded as one of the most promising electrochemical technologies for grid-connected renewable energy storage systems. The performance of VRFBs, however, strongly depends on the membrane, one of the key components of VRFBs with critical dual functions of promotion of diffusion of active species (H + , H 3 O + , SO 4 2−, or SO 4 H − ) and inhibition of crossover of vanadium ions. This is intrinsically related to the microstructure of membranes. For example, large and connected ionic clusters or pores in membranes are favorable for the ion transfer, but detrimental to the ion selectivity. While small and isolated hydrophilic ion clusters or pores suppress the water uptake and ion transfer, the decreased swelling ratio would enhance chemical stability of membrane. Thus, comprehensive strategies are required to realize the optimal balance between the ion selectivity, proton conductivity, and chemical stability. This review focuses on the effects of microstructure of membranes on the ion transfer and the chemical stability, including introduction of the rigid groups, electron-withdrawing groups, and hydrophobic backbones, are reviewed. The prospect of the development of membranes with high ion selectivity and high-performance VRFBs is discussed.

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Electrochemical properties of Mg3MnNi2-x% polymethyl methacrylate-multiwalled carbon nanotubes (PMMA-MWCNTs) (x = 25, 50, 75, 100)

Cited by 11 publications

References 38 publications

Membranes with Well‐Defined Selective Layer Regulated by Controlled Solvent Diffusion for High Power Density Flow Battery

Membranes with Well‐Defined Selective Layer Regulated by Controlled Solvent Diffusion for High Power Density Flow Battery

Preparation of PLGA/MWCNT Composite Nanofibers by Airflow Bubble-Spinning and Their Characterization

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

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