In situ ATR-IR study of Fe(CN)6 3−/Fe(CN)6 4− redox system on boron-doped diamond electrode

Naoki Kamoshida, Seiji Kasahara, Norihito Ikemiya, Nagahiro Hoshi, Masashi Nakamura, Yasuaki Einaga

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hexacyanoferrate redox couple is extensively used as a benchmark to evaluate electrode activity in aqueous electrochemistry. Interestingly, boron-doped diamond (BDD) electrode shows surface-dependent behaviors: fast electron transfer rate on hydrogen terminated surface and slow rate on oxygen terminated surface. On the other hand, origin of the surface-dependent response still remains unclear. In this study, we spectroscopically investigated the determinants of electrochemical activity of this system using in situ ATR-IR technique. Our experiment revealed that adsorbed intermediate species of this redox system exist on the hydrogen terminated BDD. On the oxygen terminated BDD, the bands of adsorbed species were weakened, indicating that the oxygen functional groups specifically inhibited the adsorption of the intermediate species.

Original languageEnglish
Pages (from-to)50-53
Number of pages4
JournalDiamond and Related Materials
Volume93
DOIs
Publication statusPublished - 2019 Mar 1

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Keywords

  • ATR-IR
  • Boron-doped diamond
  • Electrochemistry
  • In situ spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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