In situ infrared spectroscopy of dopamine oxidation/reduction reactions on a polycrystalline boron-doped diamond electrode

Ryo Hosoda, Naoki Kamoshida, Nagahiro Hoshi, Yasuaki Einaga, Masashi Nakamura

Research output: Contribution to journalArticlepeer-review

Abstract

The oxidation of dopamine (DA) on a boron-doped diamond (BDD) electrode was investigated using in situ attenuated total reflection infrared spectroscopy (ATR-IR) and infrared reflection absorption spectroscopy (IRAS). Voltammogram showed multiple anodic/cathodic peaks for the oxidation/reduction of DA and its oxidized derivatives on the BDD electrode. The oxidation/reduction species on the surface and in solution were assigned using ATR-IR and IRAS, respectively. The anodic oxidation of DA promoted polymerization, and the polymerized DA (PDA) was continuously deposited on BDD without being reduced by potential cycles, which resulted in the irreversible behavior of the voltammogram. A decrease in the oxidation current of DA by potential cycles was due to the deposition of PDA. Some intermediate quinone species, such as dopaminequinone and dopaminechrome, were reversibly reduced to hydroquinone.

Original languageEnglish
Pages (from-to)814-818
Number of pages5
JournalCarbon
Volume171
DOIs
Publication statusPublished - 2021 Jan

Keywords

  • Attenuated total reflection infrared spectroscopy
  • Boron doped diamond
  • Dopamine
  • Infrared reflection absorption spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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