Application of Noble Metal-TiO2 Schottky Barrier Diodes as Dissolved Hydrogen Sensor

Jun ichi Tani, Nobuyoshi Hara, Katsuhisa Sugimoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

An application of noble metal-TiO2 Schottky barrier diodes to dissolved hydrogen (DH) sensors was examined in aqueous solutions containing 2.9 × 10−2–24.5 mass ppb DH at 300 K. It was found that Pd-TiO2 diodes showed quantitative relationship between their response voltages and DH concentrations in the range of 2.9 × 10−2 to 1.5 mass ppb and they could work as DH sensors. Their 90% response times to DH concentrations were less than 3 ks. They also had sensitivities to H+ ions, but the sensitivities were less than 10% of their sensitivities to DH. Pd-TiO2 diodes suffered from serious hydrogen embrittlement in solutions having higher DH concentrations. To improve this fault, Pd-Au and Pd-Ag alloy-TiO2 diodes were examined. As a result, a Pd-33 at% Ag alloy-TiO2 diode was found to have a good resistance to hydrogen embrittlement. Its sensitivity to DH concentration, however, slightly deteriorated with alloying Ag.

Original languageEnglish
Pages (from-to)3-9
Number of pages7
JournalZairyo-to-Kankyo
Volume41
Issue number1
DOIs
Publication statusPublished - 1992 Jan 1

Keywords

  • Pd
  • Pd-Ag alloy
  • Pd-Au alloy
  • Schottky barrier diode
  • TiO single crystal
  • dissolved hydrogen sensor
  • hydrogen embrittlement

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry

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