| Project/Area Number |
21K14714
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | Japan Advanced Institute of Science and Technology |
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Principal Investigator |
Badam Rajashekar 北陸先端科学技術大学院大学, 先端科学技術研究科, 講師 (10794670)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Project Status |
Discontinued (Fiscal Year 2022)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | OER / Polymer metal complexes / PG metal free catalysts / Single atom catalysts / Li-O2 batteries / single atom catalysts / O2 reduction reaction / O2 evolution reaction / PG-metal free catalysts / Polymer complexes |
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| Outline of Research at the Start |
Li-oxygen battery high gravimetric capacity will be the best suitable device for electric vehicle application to reach 500 miles driving range. Reversible formation and decomposition of Li2O2 is the key factor that determines high capacity and long durability. The present work with a strategy to utilize atomically dispersed non noble transition metals on nitrogen rich substrate to tune the formation and decomposition of Li2O2 at cathode. We utilize conducting polymer metal complexes with high char yield as precursors to prepare single atom catalysts (SAC).
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| Outline of Annual Research Achievements |
Highly reversible Li-O2 batteries with low overpotential is the key goal to realise reliable metal air battery technology. Here we propose the use of atomically dispersed metal centres coordinated to diimine moieties of conjugated polymer as bifunctional catalysts without any further modification for Li-O2 battery applications. Poly(bisiminoacenaphthenequinone) (BIAN) iron complex (BP-Fe) catalysts showed high OER activity enabling 100% coulombic efficiency for 160 long charge discharge cycles with limitation of capacity to 500 mAh/g at 250 mA/g current. The overpotential corresponding to charging was as less as ~1.0 V with almost no change in discharge overpotential across 160 cycles. Alongside it showed commendable rate capability with just 170 mV of increment of charge overpotential when the charge-discharge rate increased from 100 to 500 mA/g. Further, using this catalyst BP-Fe polymer metal complex, single atom catalyst containing Fe was successfully prepared using a facile pyrolysis method at 800 C. HR-TEM characterization visually confirmed the formation of Fe based single atom catalyst. Composition of the Fe-SAC has been characterized using X-ray photoelectron spectroscopy. With this we present a simple way to prepare Fe-SAC using BIAN-Fe complex.
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