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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...
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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...
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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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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Controlling Ion Uptake in Carboxylated Mixed Conductors.

Zeyuan Sun1, Mengting Sun1, Siyu Qin1

  • 1Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, 18015, USA.

Advanced Materials (Deerfield Beach, Fla.)
|December 4, 2024
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Summary

Understanding ion transport in organic mixed ionic-electronic conductors (OMIECs) is key for energy devices. This study reveals how polymer side-chain chemistry dictates ion movement and swelling during doping, enabling better OMIEC design.

Keywords:
carboxylated polythiophenesgrazing incidence x‐ray fluorescenceion dynamicsmixed ionic‐electronic conductors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Organic mixed ionic-electronic conductors (OMIECs) are promising for energy storage and bioelectronics.
  • Charge compensation mechanisms in OMIECs are poorly understood, often oversimplified.
  • Counterion effects are critical but often neglected in OMIEC research.

Purpose of the Study:

  • To investigate charge compensation mechanisms in p-channel carboxylated OMIECs.
  • To understand the role of side-chain functionality in ion dynamics and swelling.
  • To provide design principles for next-generation OMIECs.

Main Methods:

  • Synthesis and electrochemical characterization of carboxylated polymers.
  • Investigation of swelling behavior with varying electrolytes.
  • Operando grazing incidence X-ray fluorescence (GIXRF) for in-situ analysis.

Main Results:

  • Carboxylic acid functionalized polymers showed cation expulsion and deswelling during doping.
  • Ethoxycarbonyl counterparts exhibited anion-driven doping and mass increase.
  • GIXRF confirmed robust cation interaction in carboxylated polymers, absent in ester functionalized ones.

Conclusions:

  • Side-chain chemistry significantly influences ion dynamics and conduction mechanisms in OMIECs.
  • Cations play a crucial role in mitigating swelling by counterbalancing anions.
  • Tailoring functionality offers a pathway to design high-performance OMIECs with controlled swelling.