26August2019

Nano-Micro Letters

Integrated System of solar Cells with Hierarchical NiCo2O4 Battery-Supercapacitor Hybrid Devices for Self-driving Light-emitting Diodes

Yuliang Yuan1, 2, Yangdan Lu1, Bei-Er Jia1, Haichao Tang1, Lingxiang Chen2, Yu-Jia Zeng3, Yang Hou4, 5, *, Qinghua Zhang4, 5, Qinggang He4, 5, Lei Jiao6, Jianxing Leng6, Zhizhen Ye1, Jianguo Lu1, 2, 5, *

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Nano-Micro Lett. (2019) 11: 42

First Online: 22 May 2019 (Article)

DOI:10.1007/s40820-019-0274-0

*Corresponding author. E-mail: yhou@zju.edu.cn (Yang Hou);  lujianguo@zju.edu.cn (Jianguo Lu)

 

Abstract

 


Toc

Intermittency of solar energy is a huge challenge for energy conversion, storage, and utilization. Here, an integrated system has been provided, composed of a-Si:H solar cells as energy conversion device, NiCo2O4 arrays 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, combined with capacitive electrode made of active carbon (AC), BSHs were assembled with energy density of 16.6 Wh kg–1, power density of 7,285 W kg–1, long-term cycling stability with 100% retention after 15,000 cycles, and rather low self-discharge. The NiCo2O4//AC BSH was charged to 1.6 V in one second by the a-Si:H solar cells and acted as reliable power sources for powering LEDs. The integrated system is rational for operation, having an overall efficiency of 8.1% with the storage efficiency of 74.24%. The integrated system demonstrates a stable solar power conversion, outstanding energy storage behavior, and reliable light emitting, confirming the great prospect for applications. This study offers a precious strategy to design a self-driven integrated system for highly efficient energy utilization.


 

Keywords

Integrated system; NiCo2O4; Battery-supercapacitor hybrid devices; Self-driving

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