Surface enhanced Raman spectroscopy measurement of surface pH at the electrode during Ni electrodeposition reaction

Takayuki Homma, Masahiro Kunimoto, Moe Sasaki, Tomoya Hanai, Masahiro Yanagisawa

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Abstract: In this work, we developed a precise approach to analyze local proton concentration at the solid/liquid interface of electrodes, i.e. “surface pH”, during electrochemical reactions. For this, surface enhanced Raman spectroscopy (SERS) was applied to analyze pH-dependent structural changes of the –COOH group of p-mercaptobenzoic acid (p-MBA) modified onto Au nanoparticles (NPs) on the substrate close to a working electrode. Measurements using this system identified deprotonation of –COOH of p-MBA. Since preliminary experiments and density functional theory calculations suggest that the pKa of p-MBA attached to Au NPs is close to that in bulk solution, the SERS results indicate pH increase due to proton consumption by the cathodic overpotential of the working electrode. As an example, we applied this system to surface pH monitoring in electrodeposition process of Ni in an acidic bath, which indicated the validity of our method for precise detection of pH changes at electrode interfaces in situ.

本文言語English
ページ(範囲)561-567
ページ数7
ジャーナルJournal of Applied Electrochemistry
48
6
DOI
出版ステータスPublished - 2018 6 1

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学
  • 材料化学

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