Amphiphilic organic/inorganic nanohybrid macromolecules for intermediate-temperature proton conducting electrolyte membranes

Itaru Homma, H. Nakajima, O. Nishikawa, T. Sugimoto, S. Nomura

研究成果: Article査読

44 被引用数 (Scopus)

抄録

Proton exchange membrane fuel cells (PEMFCs) have been considered to be a key technology for renewable energy systems such as an alternative battery for electric vehicles (EVs), stationary power generators, and mobile phones. Intermediate temperature operation of PEMFCs overcome most of the technological problems of the current PEM system such as CO poisoning, cathode overpotential, and complicated water and heat management. As a membrane is recognized to be a key element for more efficient PEMFCs, new classes of polymer electrolytes have been investigated elsewhere. In this paper, a new class of amphiphilic organic/inorganic hybrid membranes have been synthesized through sol-gel processing of bridged polysilsesquioxanes. The membrane doped with acidic moieties such as 12-phosphotungstic acid shows large protonic conductivities at intermediate temperatures up to 140°C and was found to be flexible as well as thermally stable due to the temperature tolerant inorganic frameworks in the hybrids. The fast ionic transport through the hybrid macromolecules has been possibly ascribed to nanosized phase separation of amphiphilic macromolecules. The proton conductivity of the hybrid was 3 × 10-2 S/cm at 140°C without degradation, which can potentially be used as an advanced PEM electrolyte membrane for intermediate temperature operation.

本文言語English
ジャーナルJournal of the Electrochemical Society
149
10
DOI
出版ステータスPublished - 2002 10 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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