Cyanide-coordinated Fe(III) meso-tetra(4-carboxyphenyl) porphyrin as a possible electrocatalytic material for selective H 2S oxidation

Jason A. Bennett, Marc A. Neiswonger, Christopher D. Wheeler, James E. Pander, Stephanie E. McKinney

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Electrodeposited Fe(III) meso-Tetra(4-carboxyphenyl) porphyrin with cyanide ligands coordinated to the central iron ion was investigated as a possible material capable of selectively oxidizing H 2S in the presence of CO and NO in physiologically relevant solutions. Preliminary results suggest this to be an attractive material as it oxidized H 2S at low potentials (0.15 V vs. AgAgCl) while exhibiting only mild activity toward both CO and NO. While this is a step in the right direction, the selectivity is currently inadequate for practical applications. Additionally, the electrocatalyst also exhibited a limited response at elevated sulfide concentrations, presumably due to the deposition of S 0 on the electrode surface. However, a cathodic-post run treatment was able to regenerate the electrochemical activity of the porphyrin-modified electrode surface by stripping any S 0 that deposited on the electrode surface during the H 2S oxidation. The imperfect porphyrin coverage of the electrode surface and incomplete coordination of cyanide are suspected as the primary reasons for these shortcomings. Research is ongoing to remedy these limitations.

Original languageEnglish (US)
Pages (from-to)F119-F124
JournalJournal of the Electrochemical Society
Issue number5
StatePublished - Apr 9 2012


All Science Journal Classification (ASJC) codes

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

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