Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery
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- Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery
- Kim, Byung-Man; Lee, Myeong-Hee; Dilimon Vijayan Sobhana; Kim, Jeong Soo; Nam, Jung Seung; Cho, Yoon-Gyo; Noh, Hyun Kuk; Roh, Deok-Ho; Kwon, Tae-Hyuk; Song, Hyun-Kon
- Issue Date
- Royal Society of Chemistry
- ENERGY & ENVIRONMENTAL SCIENCE, v.13, no.5, pp.1473 - 1480
- 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 (eta(overall)) of 11.5% under the dim light condition. This unprecedented eta(overall) 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-/I-3(-)) 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-/I-3(-) 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.
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