【摘 要】
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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
【机 构】
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State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang Unive
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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 den-sity 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 emit-ting. Our study offers a precious strategy to design a self-driven integrated system for highly efficient energy utilization.
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