Integrated System of Solar Cells with Hierarchical NiCo2O4 Battery-Supercapacitor Hybrid Devices for Self-Driving Light-Emitting Diodes

Yuliang Yuan; Yangdan Lu; Bei-Er Jia; Haichao Tang; Lingxiang Chen; Yu-Jia Zeng; Yang Hou; Qinghua Zhang; Qinggang He; Lei Jiao; Jianxing Leng; Zhizhen Ye; Jianguo Lu

doi:10.1007/s40820-019-0274-0

Integrated System of Solar Cells with Hierarchical NiCo₂O₄ Battery-Supercapacitor Hybrid Devices for Self-Driving Light-Emitting Diodes

Nanomicro Lett. 2019 May 22;11(1):42. doi: 10.1007/s40820-019-0274-0.

Authors

Yuliang Yuan^{1

2}, Yangdan Lu¹, Bei-Er Jia¹, Haichao Tang¹, Lingxiang Chen², Yu-Jia Zeng³, Yang Hou^{4

5}, Qinghua Zhang^{6

7}, Qinggang He^{6

7}, Lei Jiao⁸, Jianxing Leng⁸, Zhizhen Ye¹, Jianguo Lu^{9

10

11}

Affiliations

¹ State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
² Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, People's Republic of China.
³ Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, People's Republic of China.
⁴ College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China. yhou@zju.edu.cn.
⁵ Ningbo Research Institute, Zhejiang University, Ningbo, 315100, People's Republic of China. yhou@zju.edu.cn.
⁶ College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
⁷ Ningbo Research Institute, Zhejiang University, Ningbo, 315100, People's Republic of China.
⁸ Ocean College, Zhejiang University, Zhoushan, 316021, People's Republic of China.
⁹ State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China. lujianguo@zju.edu.cn.
¹⁰ Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, People's Republic of China. lujianguo@zju.edu.cn.
¹¹ Ningbo Research Institute, Zhejiang University, Ningbo, 315100, People's Republic of China. lujianguo@zju.edu.cn.

Abstract

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.

Keywords: Battery-supercapacitor hybrid devices; Integrated system; LED; NiCo2O4; Self-driving.