2015 Fiscal Year Final Research Report
A Novel diffusion mechanism of metal ions at Ionic Liquid/Electrode Interface Studied by In-situ Electrochemical XPS
| Project/Area Number |
25620015
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Physical chemistry
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | イオン液体 / 拡散 / 電極 / XPS / 高速拡散 / ホッピング / 金属イオン / 界面 |
|---|
| Outline of Final Research Achievements |
The interface between ionic liquids containing metal ions (Ag+, Cu+, Li+) and electrode surface (We especially focused on a diffusion mechanism of metal ions in a diffusion layer under cathodic applied potential.) was investigated using originally developed in-situ electrochemical X-ray photoelectron spectroscopy (EC-XPS). We observed that a wide depletion layer (a layer where a concentration of metal ions is extremely low) was formed close the electrode. By a detailed analysis, we revealed that a depletion layer was formed by the abnormally fast diffusion which is much faster than that expected from the viscosity of ionic liquid and conventional Stokes-Einstein equation. We proposed a novel diffusion model in which metal ions diffuse by a hopping mechanism. Based on this model, we firstly succeeded in controlling a diffusion velocity by adding an inactive ion to an ionic liquid by controlling a concentration of holes (hopping site).
|
| Free Research Field |
物理化学
|
