Palladium-polyelectrolyte hybrid nanoparticles for hydrogen sensor in fuel cells

Satoshi Ohara, Yoshiharu Hatakeyama, Mitsuo Umetsu, Kazuyoshi Sato, Takashi Naka, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We prepared palladium-polyelectrolyte hybrid nanoparticles by using a metallization of polyelectrolyte. In this study, we selected polyacrylic acid (PAA) as a polyelectrolyte and reduced the palladium ions on the PAA by using ascorbic acids in order to form a unique spherically shaped mosslike hybrid nanoparticle. Palladium (Pd) can absorb hydrogen to become PdHx, and the storage of hydrogen increases the electrical resistance and volume of Pd materials. The use of this material is attracting growing interest as a reliable, cheap, ultracompact, and safe hydrogen sensor for use in fuel cells. We showed the utilization of the Pd-PAA hybrid nanoparticles as a highly sensitive hydrogen sensor that exhibited a switch response depending on volume expansion in a cyclic atmosphere exchange.

Original languageEnglish
Pages (from-to)367-370
Number of pages4
JournalJournal of Power Sources
Issue number1
Publication statusPublished - 2009 Aug 1


  • Hybrid nanoparticle
  • Hydrogen sensor
  • Palladium
  • Polyacrylic acid
  • Polyelectrolyte

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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