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Issue 5, 2020
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Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery

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Photo-rechargeable batteries (PRBs) benefit from their bifunctionality covering energy harvesting and storage. However, dim-light performances of the PRBs for indoor applications have not been reported. Herein, we present an external-power-free single-structured PRB named a dye-sensitized photo-rechargeable battery (DSPB) with an outstanding light-to-charge energy efficiency (ηoverall) of 11.5% under the dim light condition. This unprecedented ηoverall was attributed to the thermodynamically-favorable design of the DSPB that maximizes the working potential. At high-power irradiation, the kinetically-fast but thermodynamically-unfavorable iodine mediator (I/I3) showed the highest charge and discharge capacities even if its discharge voltage was lowest. Under dim-light for indoor applications, however, the thermodynamically-favorable but kinetically-slow copper complex mediator (Cu+/2+(dmp)2) showed energy density and efficiency superior to I/I3 because its kinetics did not limit the harvesting capacity. The successful demonstration of the ability of the DSPB to operate a temperature-sensing IoT device only by indoor light opens the possibility of realizing indoor-light-harvesting PRBs.

Graphical abstract: Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery

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Supplementary files

Article information

09 Oct 2019
28 Nov 2019
First published
12 Dec 2019

Energy Environ. Sci., 2020,13, 1473-1480
Article type

Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery

B. Kim, M. Lee, V. S. Dilimon, J. S. Kim, J. S. Nam, Y. Cho, H. K. Noh, D. Roh, T. Kwon and H. Song, Energy Environ. Sci., 2020, 13, 1473
DOI: 10.1039/C9EE03245B

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