Development of photovoltaic redox flow battery using aqueous iodide/triiodide electrolyte
| Project/Area Number |
26810132
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Device related chemistry
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
BYON HYE RYUNG 国立研究開発法人理化学研究所, Kim表面界面科学研究室, 客員研究員 (70606409)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | Li-I2 battery / photoanode / hematite / photoelectrode / redox battery / solar stimulatation / flow battery |
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| Outline of Final Research Achievements |
The aqueous lithium redox flow batteries are promising in terms of performance, energy density and operation efficiency. Further integrating solar power on this energy system could only be beneficial in both an operational and economical point of view. We demonstrate a novel two-electrode carbon free solar stimulated aqueous Li-I2 battery device, which in situ stores electricity using an aqueous I-/I3- redox couple through the integration of a hematite photoelectrode at the cathode. Under illumination, the electrons and holes stemmed from the absorption of photons are separated in the space charge layer and accumulate within the hematite photoelectrode. The maximum voltage delivered by the cell is more negative under illumination (E-sun = 3.4 V) than in dark (E-dark = 3.55 V) due to this charge injection. The aqueous two-electrode photoassisted battery exhibited robust behavior for 30 cycles (~400 h) with coulombic efficiencies of ~99.2% and energy efficiencies of 85%.
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Report
(3 results)
Research Products
(2 results)
