Quaternized poly (2,6 dimethyl–1,4 phenylene oxide)/polysulfone blended anion exchange membrane for alkaline fuel cells application

Msomi, Phumlani Fortune; Nonjola, Patrick; Ndungu, Patrick; Ramontja, James

doi:10.1016/j.matpr.2017.12.381

Cited by 7 publications

(17 citation statements)

References 13 publications

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“…The vacuum-dried AEMs were immersed in a 2.0 M solution of 2-Methylimidazole for 24 h to complete quaternization. The membranes were then immersed in a 1 M KOH solution for 24 h to change the membranes from Br − to OH − form [4,11,16]. Scheme 1 below outlines the fabrication method of ImPPO/ZIF-8.…”

Section: Fabrication Of the Organic-inorganic Composite Membrane (Imppo/zif-8)mentioning

confidence: 99%

“…M dry was obtained by drying the membrane at 100 • C in a vacuum over overnight. Equation (1) was used to calculate the WU [11,16].…”

Section: Water Uptake (Wu) Swelling Ratio (Sr) and Contact Angle (Ca)mentioning

confidence: 99%

“…where M wet is the weight of wet membrane and M dry is the weight of wet membrane. Analog micrometer with a range of 0-25 mm and an accuracy of 0.01 mm was used to measure the length of the membranes before and after soaking them in distilled water for 72 h. The length was measured every 24 h. Equation ( 2) was used to calculate the membrane swelling ratio (SR) (%) [4,11]:…”

Section: Water Uptake (Wu) Swelling Ratio (Sr) and Contact Angle (Ca)mentioning

confidence: 99%

“…This increases the amorphous phases of the polymer matrix, which then increases the IC and enhances the membrane's intrinsic properties. Also, metal oxide-based inorganic fillers can act as Lewis acid sites, thereby retaining water, increasing ion conductivity, and improving membrane properties [11].…”

Section: Introductionmentioning

confidence: 99%

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Imidazolium-Quaternized Poly(2,6-Dimethyl-1,4-Phenylene Oxide)/Zeolitic Imidazole Framework-8 Composite Membrane as Polymer Electrolyte for Fuel-Cell Application

2022

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Anion exchange membrane fuel cells (AEMFCs) are considered superior to their counterpart proton exchange fuel cells due to their many advantages. Both fuel cells use membranes as polymer electrolytes to improve fuel-cell properties and power output. This work evaluates a series of imidazolium-quaternized poly(2,6-dimethyl-1,4-phenylene oxide) (ImPPO) functionalized zeolitic imidazole framework-8 (ZIF-8) (ImPPO/ZIF-8) as anion exchange membrane (AEM) electrolytes in a direct methanol alkaline fuel cell. FTIR and 1H NMR were used to confirm the successful membrane fabrication. SEM and TGA were used to study the morphological and thermal stability properties of the ImPPO/ZIF-8 membranes. The AEMs obtained in this work had contact angles ranging from 55.27–106.73°, water uptake from 9–83%, ion exchange capacity (IEC) from 1.93–3.15 mmol/g, and ion conductivity (IC) from 1.02–2.43 mS/cm. The best-performing membrane, ImPPO/3%ZIF-8, showed a water uptake of up to 35% at 80 °C, a swelling ratio of 15.1% after 72 h, IEC of 4.06 mmol/g, and IC of 1.96 mS/cm. A power density of 158.10 mW/cm2 was obtained. This makes ZIF-8 a good prospect as a filler for enhancing membrane properties.

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Section: Fabrication Of the Organic-inorganic Composite Membrane (Imppo/zif-8)mentioning

confidence: 99%

“…M dry was obtained by drying the membrane at 100 • C in a vacuum over overnight. Equation (1) was used to calculate the WU [11,16].…”

Section: Water Uptake (Wu) Swelling Ratio (Sr) and Contact Angle (Ca)mentioning

confidence: 99%

Section: Water Uptake (Wu) Swelling Ratio (Sr) and Contact Angle (Ca)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Imidazolium-Quaternized Poly(2,6-Dimethyl-1,4-Phenylene Oxide)/Zeolitic Imidazole Framework-8 Composite Membrane as Polymer Electrolyte for Fuel-Cell Application

2022

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“…However, a high IEC value causes excessive dimensional change in the membrane along with a high water uptake, which leads to separation of the membrane electrode assembly (MEA) during the manufacture and deterioration of fuel cell durability from the wet-dry repetition [ 13 , 14 ]. As mentioned above, various studies have achieved excellent dimensional stability along with high IEC values such as blended membranes [ 15 , 16 , 17 , 18 ]; inorganic/organic composite membranes [ 6 , 19 , 20 ]; and the backbone design of comb-shaped [ 21 , 22 , 23 ], branching [ 24 , 25 , 26 ], and cross-linking [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydroxide Conductivity and Dimensional Stability with Blended Membranes Containing Hyperbranched PAES/Linear PPO as Anion Exchange Membranes

et al. 2020

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A series of novel blended anion exchange membranes (AEMs) were prepared with hyperbranched brominated poly(arylene ether sulfone) (Br-HB-PAES) and linear chloromethylated poly(phenylene oxide) (CM-PPO). The as-prepared blended membranes were fabricated with different weight ratios of Br-HB-PAES to CM-PPO, and the quaternization reaction for introducing the ionic functional group was performed by triethylamine. The Q-PAES/PPO-XY (quaternized-PAES/PPO-XY) blended membranes promoted the ion channel formation as the strong hydrogen bonds interconnecting the two polymers were maintained, and showed an improved hydroxide conductivity with excellent thermal behavior. In particular, the Q-PAES/PPO-55 membrane showed a very high hydroxide ion conductivity (90.9 mS cm−1) compared to the pristine Q-HB-PAES membrane (32.8 mS cm−1), a result supported by the morphology of the membrane as determined by the AFM analysis. In addition, the rigid hyperbranched structure showed a suppressed swelling ratio of 17.9–24.9% despite an excessive water uptake of 33.2–50.3% at 90 °C, and demonstrated a remarkable alkaline stability under 2.0 M KOH conditions over 1000 h.

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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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Quaternized poly (2,6 dimethyl–1,4 phenylene oxide)/polysulfone blended anion exchange membrane for alkaline fuel cells application

Cited by 7 publications

References 13 publications

Imidazolium-Quaternized Poly(2,6-Dimethyl-1,4-Phenylene Oxide)/Zeolitic Imidazole Framework-8 Composite Membrane as Polymer Electrolyte for Fuel-Cell Application

Imidazolium-Quaternized Poly(2,6-Dimethyl-1,4-Phenylene Oxide)/Zeolitic Imidazole Framework-8 Composite Membrane as Polymer Electrolyte for Fuel-Cell Application

Enhanced Hydroxide Conductivity and Dimensional Stability with Blended Membranes Containing Hyperbranched PAES/Linear PPO as Anion Exchange Membranes

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

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