Redox behavior of iridium octaethylporphycene and electrocatalytic hydrogen evolution

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Abstract

The electrochemical properties of β-octaethylporphycene iridium complex (Ir-OEPo) were determined. Based on the electro-spectro measurement results, the reduction of Ir-OEPo did not occur at the central metal but at the ligand, while the reduction of β-octaethylporphyrin iridium complex (Ir-OEPor) occurred at the central iridium. A catalytic current was observed during the cyclic voltammetry (CV) measurements with trifluoroacetic acid (TFA) under a reductive condition, indicating the catalytic reactivity of Ir-OEPo for the hydrogen evolution reaction (HER). By constant potential electrolysis, hydrogen gas was detected by gas chromatography (GC) and the catalytic reactivity of Ir-OEPo was confirmed. The HER mechanism via ligand reduction of macrocyclic aromatic complexes could be one of the concepts for the development of new catalysts.

Original languageEnglish
JournalJournal of Porphyrins and Phthalocyanines
DOIs
Publication statusAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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