Journal
NANO-MICRO LETTERS
Volume 11, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0274-0
Keywords
Integrated system; NiCo2O4; Battery-supercapacitor hybrid devices; Self-driving; LED
Funding
- National Natural Science Foundation of China [51702284, 21878270]
- Zhejiang Provincial Natural Science Foundation of China [LR16F040001, LR19B060002]
- Startup Foundation for Hundred-Talent Program of Zhejiang University [112100-193820101/001/022]
- Shenzhen Science and Technology Project of China [JCYJ20170412105400428]
- Open Project of Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University
- Innovation Platform of Energy Storage Engineering and New Material in Zhejiang University [K19-534202-002]
- Provincial Innovation Team on Hydrogen Electric Hybrid Power Systems in Zhejiang Province
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An integrated system has been provided with a-Si/H solar cells as energy conversion device, NiCo2O4 battery-supercapacitor hybrid (BSH) as energy storage device, and light emitting diodes (LEDs) as energy utilization device. By designing three-dimensional hierarchical NiCo2O4 arrays as faradic electrode, with capacitive electrode of active carbon (AC), BSHs were assembled with energy density of 16.6 Wh kg(-1), power density of 7285 W kg(-1), long-term stability with 100% retention after 15,000 cycles, and rather low self-discharge. The NiCo2O4//AC BSH was charged to 1.6 V in 1 s by solar cells and acted as reliable sources for powering LEDs. The integrated system is rational for operation, having an overall efficiency of 8.1% with storage efficiency of 74.24%. The integrated system demonstrates a stable solar power conversion, outstanding energy storage behavior, and reliable light emitting. Our study offers a precious strategy to design a self-driven integrated system for highly efficient energy utilization.
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