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Related Concept Videos

Redox Equilibria: Overview01:23

Redox Equilibria: Overview

A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...

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Related Experiment Video

Updated: May 26, 2026

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
09:50

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Core-Shell Redox-Nanoparticles Integrate High Ammonium Selectivity with Long-Term Stability.

Shao-Wei Tsai1, Jiho Lee1, Jaeyoung Hong1

  • 1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS Nano
|May 25, 2026
PubMed
Summary
This summary is machine-generated.

Core-shell Prussian blue analogues with controlled nickel hexacyanoferrate shells enhance ammonium removal stability. This material design improves selectivity and capacity for sustainable resource recovery from wastewater.

Keywords:
Prussian blue analoguesammonium recoverycore–shell nanoparticleselectrochemical separationselectivity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Science

Background:

  • Copper-based Prussian blue analogues (PBAs) show promise for selective ammonium intercalation.
  • Limited cycling stability of PBAs hinders practical applications in ammonium removal.
  • Developing stable and selective materials is crucial for resource recovery.

Purpose of the Study:

  • To design core-shell heterostructured PBAs for enhanced ammonium selectivity and cycling stability.
  • To investigate the effect of nickel hexacyanoferrate shell thickness on performance.
  • To demonstrate efficient ammonium extraction from wastewater.

Main Methods:

  • Synthesis of core-shell copper hexacyanoferrate@nickel hexacyanoferrate (CuHCF@NiHCF) nanoparticles via two-step coprecipitation.
  • Precise control of NiHCF shell thickness (10 nm and 20 nm).
  • Electrochemical characterization, including charge-discharge cycling and electrosorption experiments in a flow cell.

Main Results:

  • Core-shell CuHCF@NiHCF nanoparticles maintained over 98% capacity after 1000 cycles.
  • 10 nm shell particles showed high NH4+/Na+ selectivity (9.2) and uptake (0.42 mmol g-1).
  • Selectivity exceeded 20 with voltage control, and efficient NH4+ extraction from wastewater was demonstrated.

Conclusions:

  • Shell thickness control is a viable strategy to enhance both ammonium selectivity and electrochemical stability.
  • CuHCF@NiHCF core-shell structures offer a promising platform for sustainable ammonium recovery.
  • This approach facilitates efficient ammonium extraction from complex matrices like municipal wastewater.