The fast penetration of electrification in rural areas calls for the development of competitive decentralized approaches. A promising solution is represented by low-cost and compact integrated solar flow batteries; however, obtaining high energy conversion performance and long device lifetime simultaneously in these systems has been challenging. Here, we use high-efficiency perovskite/silicon tandem solar cells and redox flow batteries based on robust BTMAP-Vi/NMe-TEMPO redox couples to realize a high-performance and stable solar flow battery device. Numerical analysis methods enable the rational design of both components, achieving an optimal voltage match. These efforts led to a solar-to-output electricity efficiency of 20.1% for solar flow batteries, as well as improved device lifetime, solar power conversion utilization ratio and capacity utilization rate. The conceptual design strategy presented here also suggests general future optimization approaches for integrated solar energy conversion and storage systems.
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Source data are provided with this paper. The remaining data that support the findings of this study are available from the corresponding author upon reasonable request.
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This research is supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. OSR-2017-CRG6-3453.02 to both J.-H.H. and S.J. The Australian Centre for Advanced Photovoltaics (ACAP) encompasses the Australian-based activities of the Australia–US Institute for Advanced Photovoltaics (AUSIAPV) and is supported by the Australian Renewable Energy Agency (ARENA). J.Z. and A.H.-B. thank ARENA for support via project 2014 RND075. T.L.L., B.H. and M.H. acknowledge the US National Science Foundation (CAREER Award, grant no. 1847674) and Utah State University faculty start-up fund for support. B.H. and M.H. are grateful for China Scholarship Council (CSC) Abroad Studying Fellowships to support their PhD study at Utah State University. We thank Z. Wu for help with FcNCl synthesis, and D. Roberts and X. Liu for help with NMR.
The authors declare no competing interests.
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Li, W., Zheng, J., Hu, B. et al. High-performance solar flow battery powered by a perovskite/silicon tandem solar cell. Nat. Mater. (2020). https://doi.org/10.1038/s41563-020-0720-x