Optimizing NH4+ Storage Capability of Nickel Ferrocyanide by Regulating Coordination Anion in Aqueous Electrolytes. Issue 15 (4th July 2022)

• Record Type: Journal Article
• Authors: Yu, Haoxiang; Fan, Leiyu; Yan, Huihui; Deng, Chenchen; Yan, Lei; Shu, Jie; Wang, Zhen‐Bo
• Is Part Of: ChemElectroChem. Volume 9:Issue 15(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-04
• Subjects: anions -- aqueous ammonium ion batteries -- electrolyte -- nickel ferrocyanides -- Prussian blue; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202200492
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Will anions in electrolytes affect the electrochemical properties of Prussian blue analogues for aqueous ammonium ion batteries? In this study, the electrochemical reaction between nickel ferrocyanide and ammonium ions is investigated in three common inorganic ammonium salt solutions [NH4 NO3, NH4 Cl, and (NH4 )2 SO4 ]. The results suggest that at the same NH4 + concentration, nickel ferrocyanide exhibits different electrochemical performances. The as‐prepared nickel ferrocyanide contains two phases, which are rhombohedral phase and cubic phase. Rhombohedral phase of nickel ferrocyanide has a high reactivity in 0.5 M (NH4 )2 SO4 solution during cycling while cubic phase shows good performance in 1 M NH4 NO3 and 1 M NH4 Cl electrolyte. It should be noted that the performance of cubic phase is superior to rhombohedral phase in kinetic consideration. Additionally, due to the strong coordination ability of chloride, nickel ferrocyanide exhibits an excellent electrochemical performance in 1 M NH4 NO3 solution, rather than 1 M NH4 Cl electrolyte. Abstract : Anions matter : Anions in electrolytes are able to affect the electrochemical behavior of nickel ferrocyanide in aqueous ammonium ion batteries, leading to different electrochemical performances of nickel ferrocyanide in different inorganic ammonium salt solutions [NH4 NO3, NH4 Cl, and (NH4 )2 SO4 ].