Confinement of poly(allylamine) in Preyssler-type polyoxometalate and potassium ion framework for enhanced proton conductivity

Tsukasa Iwano, Satoru Miyazawa, Ryota Osuga, Junko N. Kondo, Kayako Honjo, Takashi Kitao, Takashi Uemura, Sayaka Uchida

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Polyoxometalate based solids are promising candidates of proton-conducting solid electrolytes. In this work, a Preyssler-type polyoxometalate is crystallized with potassium ions and poly(allylamine), which is also a good proton conductor, from aqueous solutions. Here we show that the hygroscopicity induced low durability of polyoxometalate and poly(allylamine) can be circumvented by the electrostatic interaction between the polyoxometalate and protonated amine moieties in the solid state. Crystalline compounds are synthesized with poly(allylamine) of different average molecular weights, and all compounds achieve proton conductivities of 10−2 S cm−1 under mild-humidity and low-temperature conditions. Spectroscopic studies reveal that the side-chain mobility of poly(allylamine) and hydrogen-bonding network rearrangement contribute to the proton conduction of compounds with poly(allylamine) of low and high average molecular weights, respectively. While numbers of proton-conducting amorphous polyoxometalate-polymer composites are reported previously, these results show both structure-property relationship and high functionality in crystalline composites.

Original languageEnglish
Article number9
JournalCommunications Chemistry
Volume2
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry
  • Environmental Chemistry
  • Biochemistry

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