| Project/Area Number |
25620015
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| 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 / 電析 / 拡散層 / 光電子分光 |
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| 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).
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