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To further improve the redox potential of cyclopropeniums, Sanford et al. replaced one N stom with S and obtained bis(disubstituted-amino)-substituted-sulfur-cyclopropeniums (BASCPs, Entry 1 in Table 11), increasing the redox potential from 0.86 V to 1.3 V vs. Fc0/+ (51). An RFB pairing BASCPs with a dicarboximide anolyte delivered a potential of 3.2 V with excellent cycling performance. TACPs displayed relatively high redox potential among the catholyte materials. However, the air-free synthesis and purification process of TACPs make it difficult to be prepared in large scale. The high cost of TACPs in tedious synthesis process may be one of the major limiting factors. Figure 10. (a) B5 sterimol value and molecular surface area. (b) Statistical model for TACP dications solubility developed with conformationally sampled parameters. B5avg_max is the average of the three sterimol B5 values of the amine substituents from the maximum Sterimol conformation of each TACP dication. MSA is the molecular surface area of the lowest energy conformer for each TACP dication. Reproduced with permission from reference (50). Copyright 2019 American Chemical Society. 37 Qin and Fan; Clean Energy Materials ACS Symposium Series; American Chemical Society: Washington, DC, 2020.PDF Image | Electroactive Materials Next-Generation Redox Flow Batteries
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