Graphene-mediated organic-inorganic composites with improved hydroxide conductivity and outstanding alkaline stability for anion exchange membranes

Chu, Ji Young; Lee, Kyu Ha; Kim, Ae Rhan; Yoo, Dong Jin

doi:10.1016/j.compositesb.2018.11.084

Cited by 67 publications

(37 citation statements)

References 55 publications

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“…The 3,3′‐diphenyl‐4,4‐difluorodiphenylketone (DP‐DFB) was synthesized by sequential reactions of bromination and Suzuki‐Miyaura coupling reactions as described in Scheme S1 . In the first synthetic step, DFB (15.0 g), NBS (25.0 g), and H 2 SO 4 (130 mL) were put together in a 250‐mL round‐bottomed flask, and the reaction was proceeded at room temperature (RT) for 48 hours.…”

Section: Methodsmentioning

confidence: 99%

“…The hydrophilic precursor was prepared by DP‐DFB and 6F‐BPA via nucleophilic substitution reaction. The polymerization was carried out as described in our previous study . 1 H NMR (600 MHz, dimethyl sulfoxide (DMSO‐ d 6 ) 7.00‐8.10 (24H).…”

Section: Methodsmentioning

confidence: 99%

“…The ion exchange capacity (IEC), water uptake (WU), and swelling ratio (SR) values of the membrane were calculated according to previous reported study

IEC ((), \frac{mequiv .}{g}) = \frac{V_{NaOH} - C_{NaOH}}{W_{dry}}

where V NaOH and C NaOH are the consumed volume of NaOH (mL) and the concentration of NaOH ( N ), respectively.…”

Section: Methodsmentioning

confidence: 99%

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Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application

et al. 2019

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Summary Organic‐inorganic composite membranes were prepared by introducing silicon dioxide (SiO2) or functionalized SiO2 (ƒ‐SiO2) with various particle sizes into sulfonated poly (arylene ether ketone) (SPAEK) containing pendant groups, and the membrane was manufactured via directly casting which is a cost‐competitive method. The structure and morphology of the composite membranes were confirmed by 1H NMR, FT‐IR, XRD, and FE‐SEM analysis which demonstrated that inorganic nanofillers were successfully introduced. The FE‐SEM surface images showed that SiO2 and ƒ‐SiO2 particles were very well dispersed within the membrane sheets. The water uptake and swelling ratio of the composite membranes including SiO2 or ƒ‐SiO2 almost did not change when compared with the pristine SPAEK membrane. All fabricated membranes demonstrated good thermal/dimensional stabilities, robust mechanical behavior, and excellent proton conductivity. In particular, the SPAEK/ƒ‐SiO2 composite membranes exhibited improved ionic conductivity compared with the pristine membrane at 70% relative humidity (RH) due to hydrogen bonding between ─SO3H groups of functionalized inorganic filler and polymer backbone. Furthermore, the maximum power density of SPAEK/ƒ‐SiO2 reached as high as 273.11 mW cm−2 at 60°C under 70% RH. Therefore, the composite membranes with ƒ‐SiO2 testify to great potential as polymer electrolyte membrane.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application

et al. 2019

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“…were employed to generate biogas from different types of waste in order to compensate the shortage in production of natural gas, and to dispose such waste simultaneously [3][4][5]. Usually, biogas obtained using such technologies contains many components, particularly 60-70 wt.% of Methane (CH 4 ) as a main component, [30][31][32][33][34][35][36][37][38][39][40] wt.% of Carbon dioxide (CO 2 ) as a significant impurity in natural gas paths, and some trace elements (e.g., Nitrogen, ammonia, hydrogen sulphide, water vapor, etc.) [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Also, recently graphene-based membranes have been employed in other fields like fuel cells, anion exchange membranes, etc. [32][33][34]. Although polymer nanocomposite membranes have been widely studied on the lab scale, however, they have not been commercialized yet due to their poor dispersion and because these types of membranes are mostly challenged by nanofiller distribution and production of defect-free membranes with a very thin selective film [35,36].…”

Section: Introductionmentioning

confidence: 99%

A New Industrial Technology for Mass Production of Graphene/PEBA Membranes for CO2/CH4 Selectivity with High Dispersion, Thermal and Mechanical Performance

et al. 2020

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Polyether block amide (PEBA) nanocomposite membranes, including Graphene (GA)/PEBA membranes are considered to be a promising emerging technology for removing CO2 from natural gas and biogas. However, poor dispersion of GA in the produced membranes at industrial scale still forms the main barrier to commercialize. Within this frame, this research aims to develop a new industrial approach to produce GA/PEBA granules that could be used as a feedstock material for mass production of GA/PEBA membranes. The developed approach consists of three sequential phases. The first stage was concentrated on production of GA/PEBA granules using extrusion process (at 170–210 °C, depending on GA concentration) in the presence of Paraffin Liquid (PL) as an adhesive layer (between GA and PEBA) and assisted melting of PEBA. The second phase was devoted to production of GA/PEBA membranes using a solution casting method. The last phase was focused on evaluation of CO2/CH4 selectivity of the fabricated membranes at low and high temperatures (25 and 55 °C) at a constant feeding pressure (2 bar) using a test rig built especially for that purpose. The granules and membranes were prepared with different concentrations of GA in the range 0.05 to 0.5 wt.% and constant amount of PL (2 wt.%). Also, the morphology, physical, chemical, thermal, and mechanical behaviors of the synthesized membranes were analyzed with the help of SEM, TEM, XRD, FTIR, TGA-DTG, and universal testing machine. The results showed that incorporation of GA with PEBA using the developed approach resulted in significant improvements in dispersion, thermal, and mechanical properties (higher elasticity increased by ~10%). Also, ideal CO2/CH4 selectivity was improved by 29% at 25 °C and 32% at 55 °C.

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Quarternized polysulfone/ZSM‐5 zeolite composite anion exchange membrane separators for aluminum‐air battery

Lekoane

Msomi

2023

J of Applied Polymer Sci

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A membrane is a critical component of an Al‐air battery because it provides ion transport and ensures separation of the anode and cathode. In this work, a series of quaternized polysulfone (QPSF) membrane blended with ZSM‐5 zeolite anion exchange membranes (AEMs) were fabricated by solution casting to be used as separators in Al‐air batteries. All membranes showed moderate to excellent water uptake (WU), swelling ratio, ion exchange capacity (IEC), and ion conductivity measurements (IC). Incorporation of ZSM‐5 zeolite resulted in hydrophilicity and improved WU, with QPSF/3 wt% ZSM‐5 retaining 114% water at room temperature. The QPSF/3 wt% ZSM‐5 composite membrane was the best performing membrane with the IEC and the highest hydration number of 2.85 mmol g−1, 2.23, and a maximum of IC of 229.85 mS cm−1 at room temperature, respectively. QPSF/3 wt% ZSM‐5 retained 65% of its original IC in an alkaline medium after 7 days. QPSF/3 wt% ZSM‐5 exhibited a stable discharge voltage of 1.3 V and a specific capacity of 11,716 mAh/gAl in a laboratory fabricated Al‐air cell. This study provides an excellent anion exchange composite membrane separator candidate for Al‐air battery applications.

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Graphene-mediated organic-inorganic composites with improved hydroxide conductivity and outstanding alkaline stability for anion exchange membranes

Cited by 67 publications

References 55 publications

Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application

Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application

A New Industrial Technology for Mass Production of Graphene/PEBA Membranes for CO2/CH4 Selectivity with High Dispersion, Thermal and Mechanical Performance

Quarternized polysulfone/ZSM‐5 zeolite composite anion exchange membrane separators for aluminum‐air battery

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Graphene-mediated organic-inorganic composites with improved hydroxide conductivity and outstanding alkaline stability for anion exchange membranes

Cited by 67 publications

References 55 publications

Effect of functionalized SiO 2 toward proton conductivity of composite membranes for PEMFC application

Effect of functionalized SiO 2 toward proton conductivity of composite membranes for PEMFC application

A New Industrial Technology for Mass Production of Graphene/PEBA Membranes for CO2/CH4 Selectivity with High Dispersion, Thermal and Mechanical Performance

Quarternized polysulfone/ZSM‐5 zeolite composite anion exchange membrane separators for aluminum‐air battery

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Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application

Effect of functionalized SiO ₂ toward proton conductivity of composite membranes for PEMFC application