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Related Concept Videos

Ion Exchange01:17

Ion Exchange

678
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
678
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

828
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
828
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

559
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
559

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A high-performance hydroxide exchange membrane enabled by Cu2+-crosslinked chitosan.

Meiling Wu1, Xin Zhang1, Yun Zhao2

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA.

Nature Nanotechnology
|April 19, 2022
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Summary
This summary is machine-generated.

We developed a stable hydroxide exchange membrane (HEM) using copper-crosslinked chitosan. This material offers excellent ion transport and durability in alkaline conditions, showing promise for fuel cell applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Ion exchange membranes are crucial for electrochemical devices.
  • Hydroxide exchange membranes (HEMs) are ideal for platinum-free electrocatalysts but lack alkaline stability.

Purpose of the Study:

  • To develop a stable and high-performance hydroxide exchange membrane (HEM).
  • To investigate the potential of copper-crosslinked chitosan as a HEM material.

Main Methods:

  • Chitosan was crosslinked with Cu²⁺ ions to form nanochannels.
  • The material's ion conductivity, mechanical strength, and alkaline stability were evaluated.
  • Performance was tested in a direct methanol fuel cell.

Main Results:

  • The chitosan-Cu membrane exhibited a hydroxide conductivity of 67 mS cm⁻¹ at room temperature.
  • It demonstrated excellent stability in alkaline solutions, with only 5% conductivity loss after 1,000 hours at 80°C.
  • The membrane achieved a high power density of 305 mW cm⁻² in a direct methanol fuel cell.

Conclusions:

  • Copper-crosslinked chitosan is a promising material for stable and high-performance HEMs.
  • The metal-crosslinking strategy can inspire the design of novel ion exchange membranes for various applications.