Issue 10, 2022

Photocapacitor integrating voltage-adjustable hybrid supercapacitor and silicon solar cell generating a Joule efficiency of 86%

Abstract

Photocapacitor integrating both energy harvest and storage functions into a single device is a frontier research orientation, which facilitates the efficient and sustainable utilization of green energy. However, the multi-functions in one device and structural complexity of the integrated device, particularly the mismatch between energy harvest and storage units, lead to a relatively large energy loss in the energy storage and output processes. Here, we design a voltage adjustable hybrid supercapacitor (VAHSC) as an energy storage unit of a three-terminal photocapacitor. The VAHSC effectively harmonizes the energy harvest and storage units, resulting in the current, voltage, power, and energy match between both units. The optimal photocapacitor achieves a storage efficiency as high as 98.28% and Joule efficiency of 86.01%, along with excellent charge/discharge cycle stability. The great leap in this efficiency marks a substantial step towards the practical application of solar-charging energy storage integrated devices.

Graphical abstract: Photocapacitor integrating voltage-adjustable hybrid supercapacitor and silicon solar cell generating a Joule efficiency of 86%

Supplementary files

Article information

Article type
Paper
Submitted
01 Jun 2022
Accepted
22 Aug 2022
First published
01 Sep 2022

Energy Environ. Sci., 2022,15, 4247-4258

Photocapacitor integrating voltage-adjustable hybrid supercapacitor and silicon solar cell generating a Joule efficiency of 86%

Z. Song, J. Wu, Y. Tu, L. Sun, T. Zhu, G. Li, X. Wang, Y. Du, C. Deng, Q. Chen, W. Sun, M. Huang, L. Fan, Y. Huang, Y. Wei, Y. Xie, Y. Lin, H. Chen, J. Lin, L. Zhan, P. Gao, M. K. Nazeeruddin and W. Huang, Energy Environ. Sci., 2022, 15, 4247 DOI: 10.1039/D2EE01744J

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