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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Recent progress on iron-based hexacyanoferrates for advanced potassium-ion batteries.

Meng Zhou1, Mengna Zhang1, Qian Zhang1

  • 1College of Chemical Engineering and Technology, Yantai Nanshan University Yantai Shandong 265713 China.

Chemical Science
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

Iron hexacyanoferrate (FeHCF) shows promise for potassium-ion batteries (PIBs) but faces challenges. Strategies like structural modulation and compositing improve FeHCF performance for grid energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium-ion batteries (PIBs) are crucial for large-scale grid energy storage due to abundant potassium resources.
  • Iron hexacyanoferrate (FeHCF), a Prussian blue analogue, is a cost-effective cathode material with a high theoretical capacity and open framework.
  • Practical application of FeHCF is limited by low conductivity, interstitial water, and lattice vacancies, leading to poor capacity, stability, and rate performance.

Purpose of the Study:

  • To review recent advancements in FeHCF cathode materials for PIBs.
  • To identify key challenges hindering the practical application of FeHCF in PIBs.
  • To discuss modification strategies for enhancing potassium storage performance.

Main Methods:

  • Summarizing recent achievements in FeHCF cathode materials for PIBs.
  • Analyzing challenges impacting FeHCF performance.
  • Categorizing and discussing direct (structural modulation, doping) and indirect (morphology control, compositing, electrolyte modification) strategies.

Main Results:

  • FeHCF materials face limitations like poor conductivity and stability.
  • Various strategies, including structural modulation, doping, morphology control, compositing, and electrolyte modification, can enhance FeHCF performance.
  • These modifications aim to improve reversible capacity, cycling stability, and rate performance.

Conclusions:

  • FeHCF is a promising cathode material for PIBs, but its intrinsic limitations must be addressed.
  • A combination of direct and indirect modification strategies is effective in enhancing electrochemical performance.
  • Further research into rational design of advanced FeHCF materials is essential for high-performance PIBs.