Characterization of electrode-electrolyte interfaces using electrochemical surface forces apparatus

2017 Fiscal Year Final Research Report

• Project/Area Number: 26248002
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Tohoku University
• Principal Investigator: Kurihara Kazue 東北大学, 未来科学技術共同研究センター, 教授 (50252250)
• Co-Investigator(Kenkyū-buntansha): 粕谷 素洋 東北大学, 多元物質科学研究所, 助教 (00582040)
• Co-Investigator(Renkei-kenkyūsha): Mizukami Masashi 東北大学, 多元物質科学研究所, 准教授 (60333902)
• Project Period (FY): 2014-06-27 – 2018-03-31
• Keywords: 表面・界面 / 表面力測定 / 固-液界面 / 電気二重層 / ツインパス型表面力装置 / イオン吸着 / 表面電位 / 表面電荷密度

Outline of Final Research Achievements

Quantitative and direct evaluation of the surface potential and charge density of electrodes, determined by the adsorption of ions and chemical reactions has been one of the central questions in electrochemistry. Surface forces measurements have been regarded as one of the promising tools for evaluating them based on an analysis of the electric double layer forces. We developed a new electrochemical surface forces apparatus (EC-SFA), which can perform the measurement on forces between symmetrical electrode surfaces, using the twin-path SFA. Using this apparatus, we evaluated the surface potential, charge density and ion adsorption on various electrodes (Au, Pt etc). The counterion distribution between the Stern layer and the diffused layer of the electric double layer was directly determined using ferrocene-modified Au electrode. The process from the proton adsorption to hydrogen evolution on Pt electrodes was also monitored by varying the applied potential for the first time.

Free Research Field

界面化学