Sample dependent performance of aqueous copper hexacyanoferrate/zinc batteries

In this work, we investigate factors affecting the capacity retention of aqueous copper hexacyanoferrate/Zn batteries. We compare the performance of four different copper hexacyanoferrate (CuHCF) samples as cathode in CuHCF/Zn cells with Na2SO4 and ZnSO4 based electrolytes at different pH. In Na2SO4 electrolyte, the capacity retention is improved at lower pH, whereas cells with ZnSO4 electrolyte perform similarly at pH 2 and 4. Finally, we show that the performance of CuHCF/Zn cells is highly dependent on the CuHCF sample, underlining the necessity for detailed synthesis description and thorough structural characterization of electrode materials.

Automated summary

This study investigates factors influencing the capacity retention of aqueous copper hexacyanoferrate/Zn batteries, comparing performance of different CuHCF samples as cathodes with Na2SO4 and ZnSO4 electrolytes at different pH levels. The research shows that capacity retention is influenced by electrolyte type and pH, and highlights the importance of detailed synthesis description and structural characterization of electrode materials for optimizing CuHCF/Zn cell performance.