Stable films of zinc-hexacyanoferrate: electrochemistry and ion insertion capabilities

A stable film of zinc hexacyanoferrate is deposited on a GC (glassy carbon) substrate following a specific electrochemical protocol. The electrode maintains its characteristic even after dry and wet processes. SEM characterization confirms the cubic morphology of the materials and the IR suggests the presence of the FeII-C-N-ZnII structural unit. The electrochemical characterization indicates a very good stability of the film, thus opening application in ion exchange system. The focus is on monovalent, divalent, and trivalent ions. These results, the zinc low toxicity, and cost make zinc hexacyanoferrate films a promising candidate for many electrochemical applications.

Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries

The ZnHCF//Zn hybrid aqueous battery with selected K+ insertion/extraction shows a discharge plateau of 1.937 V at 2C.

Electrochemical Properties of Ball-Milled Zinc Hexacyanoferrate Cathode Material for Calcium Ion Batteries

In this study, ball-milled zinc hexacyanoferrate (ZnHCF) active materials, a Prussian blue analogues (PBAs), were applied in the aqueous rechargeable calcium-ion battery (ARCIB) system. X-ray diffraction (XRD) analysis confirmed that there was no structural destruction of the ZnHCF active materials upon ball milling. A comparison of the pristine and ball-milled ZnHCF active materials by scanning electron microscopy (SEM) confirmed that the ball-milled ZnHCF active material particles were smaller than those of the pristine material. The highest initial charge/discharge capacity was observed on the electrode based on the ZnHCF active material that was ball-milled for 9 h. As the time of the ball mill process was reduced, the initial charge/discharge capacity of the electrodes gradually decreased. XRD and SEM confirmed the eventual collapse of the electrode structure, which explained why the increased capacity of the ARCIB system was not sustained.