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

    4 引用 (Scopus)

    抜粋

    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. Graphical Abstract: [Figure not available: see fulltext.]

    元の言語English
    ページ(範囲)1-7
    ページ数7
    ジャーナルJournal of Applied Electrochemistry
    DOI
    出版物ステータスAccepted/In press - 2017 12 14

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Electrochemistry
    • Materials Chemistry

    フィンガープリント Surface enhanced Raman spectroscopy measurement of surface pH at the electrode during Ni electrodeposition reaction' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用