The present study focuses on the crossover of DHDMBS from the positive side of the cell to the negative side. Specifically, we have explored various approaches to mitigate the effects of crossover. These approaches include low-permeability membranes, a new symmetric cell configuration using mixed electrolytes, and operating protocols that involve polarity switching. These approaches were found to reduce fade rates by 70% - 85%. We also uncover mechanistic pathways that lead to slow chemical modification that cause capacity to decrease under strongly acidic conditions during long-term cycling. The new understanding and methods presented here will contribute towards the development of ORBAT as an inexpensive and sustainable solution for large-scale electrical energy storage.
Acknowledgement
The Authors acknowledge the financial support for this research from ARPA-E Open-FOA program (DE-AR0000337), the University of Southern California, and the Loker Hydrocarbon Research
[1] B. Yang, L. Hoober-Burkhardt, F. Wang, G. K. Surya Prakash, and S. R. Narayanan, “An Inexpensive Aqueous Flow Battery for Large-Scale Electrical Energy Storage Based on Water-Soluble Organic Redox Couples,” J. Electrochem. Soc., vol. 161, no. 9, pp. A1371–A1380, 2014.
[2] B. Yang, L. Hoober-Burkhardt, S. Krishnamoorthy, A. Murali, G. K. S. Prakash, and S. R. Narayanan, “High-Performance Aqueous Organic Flow Battery with Quinone-Based Redox Couples at Both Electrodes,” J. Electrochem. Soc., vol. 163, no. 7, pp. A1442–A1449, 2016.
[3] B. Huskinson, M. P. Marshak, C. Suh, S. Er, M. R. Gerhardt, C. J. Galvin, X. Chen, A. Aspuru-Guzik, R. G. Gordon, and M. J. Aziz, “A metal-free organic–inorganic aqueous flow battery,” Nature, vol. 505, no. 7482, pp. 195–198, 2014.
[4] E. S. Beh, D. De Porcellinis, R. L. Gracia, K. T. Xia, R. G. Gordon, and M. J. Aziz, “A Neutral pH Aqueous Organic–Organometallic Redox Flow Battery with Extremely High Capacity Retention,” ACS Energy Lett., vol. 2, no. 3, pp. 639–644, 2017.
[5] B. Hu, C. DeBruler, Z. Rhodes, and T. L. Liu, “Long-Cycling Aqueous Organic Redox Flow Battery (AORFB) toward Sustainable and Safe Energy Storage,” J. Am. Chem. Soc., vol. 139, no. 3, pp. 1207–1214, 2017.
[6] L. Hoober-Burkhardt, S. Krishnamoorthy, B. Yang, A. Murali, A. Nirmalchandar, G. K. S. Prakash, and S. R. Narayanan, “A New Michael-Reaction-Resistant Benzoquinone for Aqueous Organic Redox Flow Batteries,” J. Electrochem. Soc., vol. 164, no. 4, pp. A600–A607, 2017.