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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
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.
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.
Keywords:
carboxylated polythiophenesgrazing incidence x‐ray fluorescenceion dynamicsmixed ionic‐electronic conductorsMore Related Videos
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