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High-Entropy Prussian Blue Analogues as Cathodes for High-Performance Aqueous Al-Ion Batteries.

Zengming Qin1, Yang Han1, Junchen Lv1

  • 1College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 17, 2026
PubMed
Summary

High-entropy Prussian blue analogues (HE-PBAs) improve aqueous aluminum-ion batteries (AAIBs) by enhancing conductivity and stability. This novel cathode material offers a promising pathway for advanced energy storage solutions.

Keywords:
aqueous aluminum‐ion batterieshigh performancehigh‐entropy engineeringlocal coordination environmentprussian blue analogues

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Prussian blue analogues (PBAs) show potential as cathodes for aqueous aluminum-ion batteries (AAIBs) due to their 3D frameworks facilitating Al3+ transport.
  • However, practical use is limited by poor electronic conductivity, slow Al3+ diffusion, and structural instability.

Purpose of the Study:

  • To develop a high-entropy Prussian blue analogue (HE-HCF) cathode for enhanced aqueous Al3+ storage.
  • To investigate the effects of incorporating multiple transition metals on PBA performance.

Main Methods:

  • Synthesized a high-entropy Prussian blue analogue (HE-HCF) cathode with Mn, Fe, Ni, Cu, and Zn.
  • Utilized density functional theory (DFT) to analyze electronic conductivity and Al3+ diffusion barriers.
  • Assembled and tested a full cell using the HE-HCF cathode and a Zn-Al(P) anode.

Main Results:

  • The HE-HCF cathode exhibited altered coordination environments and enhanced reactivity of [Fe(CN)6] groups.
  • DFT calculations predicted improved electronic conductivity and reduced Al3+ diffusion barriers.
  • The HE-HCF//Zn-Al(P) full cell achieved a capacity of 110 mAh g-1 at 0.1 A g-1, energy density of 163.8 Wh kg-1, and 1600 cycles at 1.0 A g-1.

Conclusions:

  • High-entropy engineering effectively enhances the electrochemical performance of PBAs for AAIBs.
  • Strengthened metal-cyanide bonds in HE-HCF contribute to improved structural stability and long cycle life.
  • This study offers valuable insights for designing high-performance multivalent ion batteries.