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Transient Charging of Mixed Ionic-Electronic Conductors by Anomalous Diffusion
Heyi Zhang1,2, Gonzalo Rivera-Sierra1, Shirin Siahjani-Gultekin1,3
1Instituto de Tecnología Química (ITQ), Universitat Politècnica de València- Consejo Superior de Investigaciones Científicas (UPV-CSIC), València, 46022, Spain.
Advanced Materials (Deerfield Beach, Fla.)
|August 23, 2025
Summary
This study reveals how anomalous diffusion impacts charge transport in mixed ionic-electronic conductors (MIECs). Understanding this phenomenon is key for optimizing energy storage and bioelectronic devices.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Physics
Background:
- Mixed ionic-electronic conductors (MIECs) are vital for energy storage, bioelectronics, and neuromorphic computing.
- Optimizing device performance hinges on understanding charge transport dynamics in MIECs.
Purpose of the Study:
- Investigate transient charging behavior in representative MIEC systems.
- Focus on the role of anomalous diffusion in charge transport.
- Correlate electrochemical impedance spectroscopy (EIS) and transient current measurements.
Main Methods:
- Utilized electrochemical impedance spectroscopy (EIS) and transient current measurements.
- Applied the transmission line model for analysis.
- Employed fractional exponent fitting to characterize diffusion.
Main Results:
- Established a strong correlation between impedance response and transient current dynamics.
- Demonstrated the significant role of anomalous diffusion in MIEC charge transport.
- Characterized three MIEC systems: PEDOT:PSS, WO3, and n-doped PBDF.
Conclusions:
- Fractional diffusion is a key factor in MIEC charge transport.
- Findings inform the design of advanced electrochemical devices.
- Provides fundamental insights into charge carrier behavior in MIECs.
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