Alkaline durable 2-methylimidazolium containing anion-conducting electrolyte membranes synthesized by radiation-induced grafting for direct hydrazine hydrate fuel cells

Yoshimura, Kimio; Hiroki, Akihiro; Yu, Hwan‐Chul; Zhao, Yue; Shishitani, Hideyuki; Yamaguchi, Susumu; Tanaka, Hiroyuki; Maekawa, Yasunari

doi:10.1016/j.memsci.2018.12.002

Cited by 22 publications

(18 citation statements)

References 35 publications

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“…This is because the AEL contains quaternary ammonium groups, which are gradually degraded by the Hofmann elimination and/or nucleophilic substitution in typical AEMs [ 10 ]. In contrast, these degradations can be restricted in AEMs containing the graft chains with various types of imidazolium groups as anion exchange groups [ 30 , 31 ]. Thus, we will consider forming the AEL with imidazolium groups by RIAGP to prepare BPMs with high chemical stability.…”

Section: Resultsmentioning

confidence: 99%

Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Sawada

Maekawa

2021

Molecules

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We prepared novel bipolar membranes (BPMs) consisting of cation and anion exchange layers (CEL and AEL) using radiation-induced asymmetric graft polymerization (RIAGP). In this technique, graft polymers containing cation and anion exchange groups were introduced into a base film from each side. To create a clear CEL/AEL boundary, grafting reactions were performed from each surface side using two graft monomer solutions, which are immiscible in each other. Sodium p-styrenesulfonate (SSS) and acrylic acid (AA) in water were co-grafted from one side of the base ethylene-co-tetrafluoroethylene film, and chloromethyl styrene (CMS) in xylene was simultaneously grafted from the other side, and then the CMS units were quaternized to afford a BPM. The distinct SSS + AA- and CMS-grafted layers were formed owing to the immiscibility of hydrophilic SSS + AA and hydrophobic CMS monomer solutions. This is the first BPM with a clear CEL/AEL boundary prepared by RIAGP. However, in this BPM, the CEL was considerably thinner than the AEL, which may be a problem in practical applications. Then, by using different starting times of the first SSS+AA and second CMS grafting reactions, the CEL and AEL thicknesses was found to be controlled in RIAGP.

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Section: Resultsmentioning

confidence: 99%

Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Sawada

Maekawa

2021

Molecules

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“…A power density of 230 mW cm À2 has been noted by Yoshimura et al 94 with a polyvinylimidazolium hydroxide-graed AEM with a fuel cell operating on 10% hydrazine hydrate in 1 M KOH at 80 C with air (the cathode catalyst: Co-PPy/C and anode: Ni 0,9 La 0,2 ). In a different work, Yoshimura et al 204 noted a power density of 75 mW cm À2 for a copoly(1-vinyl-3propylimidazolium hydroxide/styrene/ethyne)-graed (ETFE) AEM with a fuel cell operating on 5% hydrazine hydrate in 1 M KOH at 80 C with humidied air (the cathode catalyst: Co-PPy/ C and anode: Ni 0,9 La 0,1 ).…”

Section: /Rhementioning

confidence: 90%

“…101 The standard method for the measurement of ion conductivity is impedance spectroscopy, which is carried out on the AEM samples aer the pre-treatment. A two-point probe, 95 or four-point probe 92,94,101 alternating (AC) impedance spectroscopy technique can be used. Usually measurements are made in the longitudinal direction.…”

Section: Sustainable Energy Fuelsmentioning

confidence: 99%

“…Conductivity was measured under fully hydrated conditions in a beaker lled with N 2 saturated deionised water under specic temperature (60 C in many articles). 92,94 The cell is also immersed in water, which was previously degassed and blanketed with owing Ar to avoid carbonation and preserve the OH À form of the samples. 95,98 Some research groups also placed the testing assembly into an oven with controlled temperature and humidity to minimise errors due to the effect of CO 2 interferences.…”

Section: Sustainable Energy Fuelsmentioning

confidence: 99%

“…Aer the immersion, the membranes are wiped quickly with laboratory tissue paper to remove excess surface water, and then immediately weighed and measured. 88,94 The obtained data are then used to calculate water uptake (WU) and swelling ratio (SR). 98 Chemical stability.…”

Section: Sustainable Energy Fuelsmentioning

confidence: 99%

See 2 more Smart Citations

Alkaline membrane fuel cells: anion exchange membranes and fuels

Hren

Božič²,

Fakin

et al. 2021

Sustainable Energy Fuels

209

103

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Synthesis and ex‐situ evaluation of quaternized polysulfone as an anion exchange ionomer for AEM technologies

Salazar‐Gastélum

Beltrán‐Gastélum

Calva-Yáñez

et al. 2022

J of Applied Polymer Sci

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Anion exchange ionomer (AEI) is a critical component used on anion exchange membrane fuel cell (AEMFC) and alkaline water electrolyzer (AWE). In this work, quaternized polysulfone with different functionalization degree were used as an ionomer to evaluate the performance in the oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR), both implied in the operation of AEMFC and AWE. The synthesized ionomer exhibited a better performance in both reactions in comparison to the commercial AEI Aemion®. PSf‐130 exhibited better performance, since IEC and surface area increases twice regarding the same parameters in the PSf‐60. The PSf‐130 conductivity increases three times regarding the value exhibited by PSf‐60. Finally, the Jlim and Jk increases 67% and 100% for ORR. On the other hand, the same catalytic parameter increased 44% and 35% for HOR comparing both polysulfone‐based ionomers. The Tafel slope values do not showed drastically changes for different ionomers indicating the same rate determining step (RDS) and the same mechanism in both reactions for all the ionomers.

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Alkaline durable 2-methylimidazolium containing anion-conducting electrolyte membranes synthesized by radiation-induced grafting for direct hydrazine hydrate fuel cells

Cited by 22 publications

References 35 publications

Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Alkaline membrane fuel cells: anion exchange membranes and fuels

Synthesis and ex‐situ evaluation of quaternized polysulfone as an anion exchange ionomer for AEM technologies

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