Tuning transport properties by manipulating the phase segregation of tetramethyldisiloxane segments in modified polyimide electrolytes

Tseng, Chi-Yung; Ye, Yunsheng; Joseph, Jorphin; Kao, Kuei-Yu; Rick, John; Huang, Shou‐Ling; Hwang, Bing‐Joe

doi:10.1016/j.jpowsour.2010.12.006

Cited by 17 publications

(11 citation statements)

References 43 publications

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“…The band at 704-760 cm − 1 is due to the Si-C stretch. 18,19 These results verify the successful synthesis of SPI-PDMS. The morphology of the SPI-PDMS membrane was examined using SEM and the surface images of the membrane before and after performing 100 VRFB cycling tests are shown in Figures 2a-f.…”

Section: Characterization Of the Membranesupporting

confidence: 66%

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Zhang

Huang

et al. 2015

Polym J

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A sulfonated poly(imide-siloxane) (SPI-PDMS) membrane was prepared and evaluated for its performance in a vanadium redox flow battery (VRFB). Fourier transform infrared spectroscopy analysis verified the successful synthesis of SPI-PDMS, and scanning electron microscopy images and energy-dispersive spectroscopy results illustrated the homogeneity of the membrane. The chemical stability of the SPI-PDMS membrane was superior to that of the pristine sulfonated polyimide membrane. The as-prepared SPI-PDMS membrane showed an order-of-magnitude lower permeability of VO 2+ ion (1.92 × 10 − 7 cm 2 min − 1 ) in contrast to Nafion 117 (17.1 × 10 − 7 cm 2 min − 1 ) and it possessed a much longer self-discharge time (550 h above 1.3 V) than Nafion 117 (65 h above 1.3 V). The SPI-PDMS-containing VRFB exhibited higher coulombic efficiency (98.50%-99.10%) at current densities ranging from 20 to 80 mA cm − 2 than that of Nafion 117 (80.6%-94.8%). At current densities lower than 70 mA cm − 2 , the energy efficiency of the SPI-PDMS-containing VRFB was higher than that of Nafion 117. Cyclic chargedischarge testing demonstrated that the VRFB containing the SPI-PDMS membrane had good operational stability. Overall, this low-cost SPI-PDMS membrane exhibits excellent battery performance and has considerable potential for applications in VRFBs. INTRODUCTIONThe vanadium redox flow battery (VRFB) has been attracting increasing attention as a promising candidate for large-scale energy storage systems because of its advantageous features, including long life, high reliability, non-pollution, low cost and high efficiency. 1-3 The proton-conductive membrane is an important component of VRFBs. The membrane must separate the catholyte and the anolyte, while allowing the passage of protons to form a circuit. The ideal protonconductive membrane should have a low permeability to vanadium ions, high proton conductivity, good chemical stability, strong mechanical integrity and low cost. 4 To date, the perfluorinated sulfonic acid membranes such as Nafion membranes (Dupont Co., Wilmington, DE, USA) have been widely used in VRFB systems, owing to their high proton conductivity and excellent chemical stability. However, Nafion membranes also possess disadvantages such as high vanadium ion permeability and cost, which limit their largescale commercial application in VRFB systems. 5 Consequently, a series of novel proton-conductive membranes with lower vanadium ion permeability and cost have been developed for VRFB applications such as sulfonated poly(phenylsulfone), 6 sulfonated poly(ether ether ketone) 7 and sulfonated polysulfone 8 membranes.Sulfonated polyimide (SPI) is one of the most promising potential candidates for VRFB membranes, because the polyimide can form a compact microstructure to control vanadium ion permeability, and

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Section: Characterization Of the Membranesupporting

confidence: 66%

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Zhang

Huang

et al. 2015

Polym J

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“…In particular, characteristic absorption bands appeared at 1712 cm −1 ( ν sym , C=O) and 1674 cm −1 ( ν asym , C=O), 1345 cm −1 ( ν , C=C) and ( ν , C‐N‐C) corresponding to the naphthalimide ring. Also, the adsorption bands at 1247 cm −1 ( ν sym , O=S=O), 1081 cm −1 ( ν sym , O=S=O), 1025 cm −1 ( ν asym , O=S=O), 768 cm −1 ( ν ben , O=S=O) and 627 cm −1 ( ν ben , O=S=O) are the stretching vibrations of the SO 2 functional groups of the Ntda‐SPI‐SO 3 H.TEA membrane . The FT‐IR spectrum of the Ntda‐SPI‐SO 3 H membrane reveals a difference between the TEA salt and protonated membrane, the broad band at 3660–2984 cm −1 corresponds to an OH functional group presenting from sulfonic acid.…”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired All‐Organic Soft Actuator Based on a π–π Stacked 3D Ionic Network Membrane and Ultra‐Fast Solution Processing

Cheedarala

Jeon

Kee

et al. 2014

Adv Funct Materials

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Next generation electronic products, such as wearable electronics, flexible displays, and smart mobile phones, will require the use of unprecedented electroactive soft actuators for haptic and stimuli‐responsive devices and space‐saving bio‐mimetic actuation. Here, a bio‐inspired all‐organic soft actuator with a π–π stacked and 3D ionic networked membrane based on naphthalene‐tetracarboxylic dianhydride (Ntda) and sulfonated polyimide block copolymers (SPI) is presented, utilizing an ultra‐fast solution process. The π–π stacked and self‐assembled 3D ionic networked membrane with continuous and interconnected ion transport nanochannels is synthesized by introducing simple and strong atomic level regio‐specific interactions of hydrophilic and hydrophobic SPI co‐blocks with cations and anions in the ionic liquid. Furthermore, a facile and ultrafast all‐solution process involving solvent blending, dry casting, and solvent dropping is developed to produce electro‐active soft actuators with highly conductive polyethylenedioxythiophene (PEDOT):polystyrenesulfonate (PSS) electrodes. Ionic conductivity and ion exchange capacity of the π–π stacked Ntda‐SPI membrane can be increased up to 3.1 times and 3.4 times of conventional SPI, respectively, resulting in a 3.2 times larger bending actuation. The developed bio‐inspired soft actuator is a good candidate for satisfying the tight requirements of next generation soft electronic devices due to its key benefits such as low operating voltage and comparatively large strains, as well as quick response and facile processability.

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“…[ 32 ] Sulfonated polyimide (SPI) was synthesized according to our previously reported procedure. [ 8 ] The properties of the SPI containing 80% hydrophilic units (n: m = 8: 2) are the focus of this study as shown in the Supporting Information ( Figure S6).…”

Section: Methodsmentioning

confidence: 99%

“…However, these materials have some drawbacks that limit their practical application, [ 4 ] such as high methanol crossover, loss of conductivity at temperatures above 100 ºC, and high cost. Therefore, much research is currently being directed towards obtaining membranes that overcome these problems, such as synthesizing perfl uorinated membranes modifi ed with polyimides, [5][6][7][8] polybenzimidazoles, [9][10][11] poly(vinyl alcohol), [12][13][14] and poly(ether ether ketone). [15][16][17][18] In general, aromatic PEMs only reach suitable proton conductivities with high degrees of sulfonation.…”

Section: Introductionmentioning

confidence: 99%

“…However, high sulfonation levels can lead to swelling and consequent dissolution. Compared to other approaches,8, 11, 16, 19 sulfonated membranes modified by blending, cross‐linking, coating, and/or pore‐filling seem to exhibit better performance and hence attract more attention. Particularly sought after are compositions able to be produced simply that can enhance water retention at high temperatures, decrease methanol crossover and improve stability.…”

Section: Introductionmentioning

confidence: 99%

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Sulfonated Polyimide Proton Exchange Membranes with Graphene Oxide show Improved Proton Conductivity, Methanol Crossover Impedance, and Mechanical Properties

Tseng

Cheng

et al. 2011

Advanced Energy Materials

Self Cite

172

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Graphene oxide has been utilized to enhance the proton conductivity and mechanical properties and reduce the methanol permeability of polymer exchange membranes. The membranes exhibit dramatic improvements in proton conductivity (490.3%), methanol permeability (a 508.9% decrease in methanol permeability and a near 25‐fold increase in selectivity of proton conductivity to methanol permeability were achieved at 80 °C) and the mechanical properties (134.4% enhancements in tensile strength at 30 °C) with SPI/GO_0.5 wt%.

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Tuning transport properties by manipulating the phase segregation of tetramethyldisiloxane segments in modified polyimide electrolytes

Cited by 17 publications

References 43 publications

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Bio‐Inspired All‐Organic Soft Actuator Based on a π–π Stacked 3D Ionic Network Membrane and Ultra‐Fast Solution Processing

Sulfonated Polyimide Proton Exchange Membranes with Graphene Oxide show Improved Proton Conductivity, Methanol Crossover Impedance, and Mechanical Properties

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