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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Highly Hydroxide-Conductive Nanostructured Solid Electrolyte via Predesigned Ionic Nanoaggregates.

Guangwei He1,2, Mingzhao Xu1,2, Zongyu Li1,2

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China.

ACS Applied Materials & Interfaces
|August 10, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create interconnected ionic nanoaggregates in solid electrolytes for alkaline fuel cells. This approach enhances hydroxide conductivity, paving the way for advanced fuel cell technologies.

Keywords:
alkaline fuel cellshydroxide conductivityionic nanoaggregatesmembranesolid electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Fabricating high-performance alkaline fuel cells requires interconnected ionic nanoaggregates in solid electrolytes, a significant challenge.
  • Existing methods often face issues like microphase separation, hindering optimal performance.

Purpose of the Study:

  • To present a facile and generic approach for embedding ionic nanoaggregates into nonionic polymer membranes.
  • To develop advanced solid electrolytes with high hydroxide conductivity and good mechanical properties for fuel cell applications.

Main Methods:

  • Synthesized core-shell nanoparticles (SiO2/quaternary ammonium-functionalized polystyrene) to create ionic nanoaggregates.
  • Embedded these nanoaggregates (20-70 wt%) into a polysulfone matrix to form interconnected hydroxide-conducting channels.
  • Utilized spatial confinement within the SiO2 core to aggregate hydroxide-conducting groups in the polystyrene shell.

Main Results:

  • Achieved highly connected ion channels with ion mobility comparable to Nafion.
  • Obtained a hydroxide conductivity of 188.1 mS cm⁻¹ at 80 °C, one of the highest reported values.
  • Demonstrated good mechanical properties of the resulting membranes.

Conclusions:

  • The developed method enables independent manipulation of conduction and non-conduction functions, avoiding microphase separation.
  • This strategy opens new avenues for designing high-performance solid electrolytes for diverse applications.
  • The resulting membranes show significant potential for use in advanced alkaline fuel cells.