A Study on Electrolytic Corrosion of Boron-Doped Diamond Electrodes when Decomposing Organic Compounds

Takeshi Kashiwada, Takeshi Watanabe, Yusuke Ootani, Yoshitaka Tateyama, Yasuaki Einaga

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Electrolytic corrosion of boron-doped diamond (BDD) electrodes after applying a high positive potential to decompose organic compounds in aqueous solution was studied. Scanning electron microscopy images, Raman spectra, and glow discharge optical emission spectroscopy revealed that relatively highly boron-doped domains were primarily corroded and relatively low boron-doped domains remained after electrolysis. The corrosion due to electrolysis was observed especially in aqueous solutions of acetic acid or propionic acid, while it was not observed in other organic compounds such as formic acid, glucose, and methanol. Electron spin resonance measurements after electrolysis in the acetic acid solution revealed the generation of methyl radicals on the BDD electrodes. Here, the possible mechanisms for the corrosion are discussed. Dangling bonds may be formed due to abstraction of OH groups from C-OH functional groups by methyl radicals generated on the surface of the BDD electrodes. As a result, the sp3 diamond structure would be converted to the sp2 carbon structure, which can be easily etched. Furthermore, to prevent electrolytic corrosion during electrolysis, both the current density and the pH condition in the aqueous solution were optimized. At low current densities or high pH, the BDD electrodes were stable without electrolytic corrosion even in the acetic acid aqueous solution.

Original languageEnglish
Pages (from-to)28299-28305
Number of pages7
JournalACS Applied Materials and Interfaces
Volume8
Issue number42
DOIs
Publication statusPublished - 2016 Oct 26

Fingerprint

Electrochemical corrosion
Diamond
Boron
Organic compounds
Diamonds
Electrolysis
Electrodes
Acetic acid
Acetic Acid
formic acid
Current density
Corrosion
Propionic acid
Optical emission spectroscopy
Dangling bonds
Formic acid
Glow discharges
Functional groups
Paramagnetic resonance
Glucose

Keywords

  • boron-doped diamond electrodes
  • electrolytic corrosion
  • methyl radicals
  • organic compounds
  • wastewater treatment

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

A Study on Electrolytic Corrosion of Boron-Doped Diamond Electrodes when Decomposing Organic Compounds. / Kashiwada, Takeshi; Watanabe, Takeshi; Ootani, Yusuke; Tateyama, Yoshitaka; Einaga, Yasuaki.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 42, 26.10.2016, p. 28299-28305.

Research output: Contribution to journalArticle

Kashiwada, Takeshi ; Watanabe, Takeshi ; Ootani, Yusuke ; Tateyama, Yoshitaka ; Einaga, Yasuaki. / A Study on Electrolytic Corrosion of Boron-Doped Diamond Electrodes when Decomposing Organic Compounds. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 42. pp. 28299-28305.
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