Facile-controlling of the coating amount of poly(acrylic acid)-<i>b</i>-polystyrene coated on silica nanoparticles for polymer electrolyte membrane

Tabata, Keisuke; Nohara, Tomohiro; Koseki, Kazuki; Umemoto, Kazuki; Sato, Ryota; Rodbuntum, Sasiphapa; Suzuki, Yukina; Shimada, Ryuichiro; Asakura, Satoshi; Arita, Toshihiko

doi:10.35848/1347-4065/ab7476

Cited by 12 publications

(19 citation statements)

References 30 publications

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“…These small activation energies suggest that the proton conduction of each sample undergoes hopping through hydrogen-bonding network (Grotthuss mechanism). This is the same as our previous study. ,, …”

Section: Resultssupporting

confidence: 67%

“…This is the same as our previous study. 21,24,25 According to our previous study, the proton conductivity of PAA-b-PS surface-functionalized silica is dependent upon the number density of contact point between particles. In the case of small silica particles, the density of the total conduction channel, which is proportional to the total surface area, is increased, as a result of which proton conduction is enhanced.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…According to our previous work, silica@PAA- b -PS using silica NPs with a particle size of 200 nm showed a proton conductivity of 1.22 × 10 –4 S/cm with a small activation energy of 0.20 eV at 60 °C and 98% relative humidity (RH). This small activation energy (<0.4 eV) indicates that the proton conduction in silica@PAA- b -PS undergoes with the Grotthuss mechanism (proton hopping via hydrogen bonding). , Furthermore, we have recently clarified the dependence of core size and PAA coverage on the proton conduction performance of silica@PAA- b -PS. , …”

Section: Introductionmentioning

confidence: 95%

“…22,23 clarified the dependence of core size and PAA coverage on the proton conduction performance of silica@PAA-b-PS. 24,25 To further improve the proton conductivity of silica@PAAb-PS, we investigated the dependence of the proton conductivity of the number of surface silanol groups on the surface of silica NPs. Surface silanol groups are important segments that affect silica properties such as dispersibility and serve as hydrogen-binding points with other hydrophilic substances.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Surface Silanol Density on the Proton Conductivity of Polymer-Surface-Functionalized Silica Nanoparticles

Koseki

Arita

Tabata

et al. 2021

ACS Sustainable Chem. Eng.

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We have developed a polymer electrolyte membrane (PEM) material using polymer-coated silica nanoparticles (NPs) by the reversible addition-fragmentation chain-transfer polymerization with particles (RAFT PwP) method. In this paper, we controlled the number density of surface silanol groups on the silica NPs that not only maintain the structure of the surface adsorbed polymers by RAFT PwP but also form fast proton-conducting interface to study the silanol density effect on proton conductivity. The number of surface silanol groups was successfully increased by NaOH surface treatment and decreased by heat treatment. Then, we clarified that silanol-rich silica NPs with a polyacrylic acid and polystyrene block copolymer (PAA-b-PS) applied by RAFT PwP exhibit larger proton conductivity. This result implies that hydrophilicity of the filler is one of the important factors in the design of filler-functionalized PEM with high proton conductivity.

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Section: Resultssupporting

confidence: 67%

Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 95%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Surface Silanol Density on the Proton Conductivity of Polymer-Surface-Functionalized Silica Nanoparticles

Koseki

Arita

Tabata

et al. 2021

ACS Sustainable Chem. Eng.

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“…Because of the glass transition of PS, the PAA layers which are proton conduction passways were connected continuously, and therefore, the proton conductivities were improved as compared with the previously reported one using 200 nm particle diameter silica. 21,22 To make an electrode, gold paste was attached to both sides of the molded pellets. The proton conductivities of the pelletized samples were measured by an AC impedance analyzer at 98% RH and at different temperatures (20−60 °C) within the guaranteed range of our environmental control machine (SH-222, ESPEC Corp.).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Core Size-Dependent Proton Conductivity of Silica Filler-Functionalized Polymer Electrolyte Membrane

Nohara

Koseki

Tabata

et al. 2020

ACS Sustainable Chem. Eng.

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Polymer electrolyte fuel cells (PEFC) are expected as next energy generation systems, and their performance is strongly dependent upon the polymer electrolyte membrane (PEM). We have suggested a new model of PEM with a three-dimensional proton conduction passways structure using the filler method, particularly focused on the functionalization of filler particles. The polymer surface-functionalized silica nanoparticles (NPs) with three different particle sizes were prepared by the reversible addition–fragmentation chain transfer polymerization with particles (RAFT PwP) method that we developed. Silica NPs coated with an in situ polymerized block copolymer consisted of a proton conductive polymer and a protective polymer. We confirmed that the proton conductivity increased and the activation energy decreased as the core particle size became smaller because of enlarging the total interface area between each particle and increasing the proton conduction passways.

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Facile Fabrication Technique of Polymeric Ionic Liquids‐Coated Core–Shell Nanoparticles for Polymer Electrolyte Membranes

Tabata,

Makino,

Matsuo

et al. 2023

Advanced Sustainable Systems

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Nanoparticles and nanofibers are widely used as components of polymer electrolytes for membranes in fuel cells, and many surface modification methods are reported. However, some fabrication techniques are complicated, and it is necessary to develop a simplified and precise control method. Herein, a facile fabrication method is reported for core–shell nanoparticles hierarchically coated with polymeric ionic liquids (PIL) and hydrophobic polymers as a material for polymer electrolytes. A hierarchical polymer layer on the surface of the SiO2 nanoparticles is easily constructed by repeating the facile polymer‐coating technique based on precipitation polymerization several times. The highest proton conductivity of the core–shell nanoparticles is 1.3 × 10−2 S cm−1 at 80 °C and 95% relative humidity. Although the hydrophobic polymers coated as a protective layer reduce the proton conductivity, the formation of the PIL enhances the proton conductivity in various temperature and humidity environments. Therefore, the proposed method enables the facile fabrication of polymer layers with multiple functions, such as a proton‐conductive PIL layer and hydrophobic polymer layers as protective layers on the surface of the nanoparticles. Furthermore, they are expected to be applied to energy supply and gas separation, including polyelectrolytes, for the realization of a sustainable society.

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Facile-controlling of the coating amount of poly(acrylic acid)-b-polystyrene coated on silica nanoparticles for polymer electrolyte membrane

Cited by 12 publications

References 30 publications

Effect of Surface Silanol Density on the Proton Conductivity of Polymer-Surface-Functionalized Silica Nanoparticles

Effect of Surface Silanol Density on the Proton Conductivity of Polymer-Surface-Functionalized Silica Nanoparticles

Core Size-Dependent Proton Conductivity of Silica Filler-Functionalized Polymer Electrolyte Membrane

Facile Fabrication Technique of Polymeric Ionic Liquids‐Coated Core–Shell Nanoparticles for Polymer Electrolyte Membranes

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