Hydrogen Sensing with Thin-Filmed Copper Dicyanoanthraquinone Diimine Electrodes

Chong Mau Wang, Wehn Ying Wang, Huh Letng Lin, Lilian Kao Liu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Thin-filmed copper dicyanoanthraquinone diimines, (DCNAQI)Cu, were electrochemically deposited on conductive SnO2 electrodes, and characterized in aqueous K2SO4 solutions containing methyl viologen and ferricyanide. They behave like an n-type semiconductor with a potential window 1.0 ~ -l.0 V vs, SCE. Under bandgap excitation (4, 000 cm-1), the conductance recorded with these electrodes was observed to be substantially enhanced, but very sensitive to the presence of hydrogen. A nearly linear relationship of conductance difference between light and dark against the partial pressure of hydrogen was obtained with most (DCNAQI)Cu electrodes. The adsorption of hydrogen at (DCNAQI)Cu surface follows a simple Langmuir isotherm with an equilibrium constant in the range 1.7 ~ 2.6 atm-1, as manifested by conductance measurements. Despite possessing a relatively smaller adsorption equilibrium constant, (β-methyl-DCNAQI)Cu exhibits the greatest sensitivity to hydrogen. This extraordinary sensitivity is very likely attributed to the mediation of surface states, located near the valence band.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalJournal of the Electrochemical Society
Volume142
Issue number1
DOIs
Publication statusPublished - 1995 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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