A Long Lifetime Aqueous Organic Solar Flow Battery

Wenjie Li, Emily Kerr, Marc Antoni Goulet, Hui-Chun Fu, Yuzhou Zhao, Ying Yang, Atilla Veyssal, Jr-Hau He, Roy G. Gordon, Michael J. Aziz, Song Jin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Monolithically integrated solar flow batteries (SFBs) hold promise as compact stand-alone energy systems for off-grid solar electrification. Although considerable research is devoted to studying and improving the round-trip efficiency of SFBs, little attention is paid to the device lifetime. Herein, a neutral pH aqueous electrolyte SFB with robust organic redox couples and inexpensive silicon-based photoelectrodes is demonstrated. Enabled by the excellent stability of both electrolytes and protected photoelectrodes, this SFB device exhibits not only unprecedented stable continuous cycling performance over 200 h but also a capacity utilization rate higher than 80%. Moreover, through comprehensive study on the working mechanisms of SFBs, a new theory based on instantaneous solar-to-output electricity efficiency toward more optimized device design is developed and a significantly improved solar-to-output electricity efficiency of 5.4% from single-junction silicon photoelectrodes is realized. The design principles presented in this work for extending device lifetime and boosting round trip energy efficiency will make SFBs more competitive for off-grid applications.
Original languageEnglish (US)
Pages (from-to)1900918
JournalAdvanced Energy Materials
Volume9
Issue number31
DOIs
StatePublished - Jul 8 2019

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