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Time-Resolved Spatial Distributions of Individual Components of Electroactive Films during Potentiodynamic
Rachel M Sapstead1, Robert M Dalgliesh2, Virginia C Ferreira1,3
1Centre for Sustainable Materials Processing, Department of Chemistry, University of Leicester, Leicester LE1 7RH, U.K.
ACS Physical Chemistry Au
|December 5, 2024
Summary
This study introduces event mode neutron reflectivity (NR) for high-resolution analysis of electroactive films. This technique reveals species distribution and dynamics during electrochemical processes, advancing device performance understanding.
Area of Science:
- Materials Science
- Electrochemistry
- Analytical Chemistry
Background:
- Understanding species distribution in electroactive films is crucial for device performance.
- Specular neutron reflectivity (NR) offers in situ species profiling but historically lacks temporal resolution.
- Dynamic processes in films dictate transport rates and mechanical properties.
Purpose of the Study:
- To develop and demonstrate an event mode data acquisition for NR enabling simultaneous spatial and temporal resolution.
- To investigate species distribution and dynamics during electrochemical deposition and dissolution processes.
- To provide new insights into the behavior of electroactive films under dynamic conditions.
Main Methods:
- Utilized specular neutron reflectivity (NR) with event mode data acquisition for high temporal resolution.
- Applied the technique to study polypyrrole electrodeposition and copper (Cu) deposition/dissolution in a deep eutectic solvent.
- Correlated NR-derived film thickness with coulometric assays.
Main Results:
- Achieved coupled spatial and temporal resolution for in situ NR measurements.
- Demonstrated homogeneous growth of polypyrrole films without solvent displacement (solvent volume fraction, ϕS = 0.48).
- Observed time-dependent metal speciation during Cu dissolution in a deep eutectic solvent, indicating a complex mechanism.
Conclusions:
- Event mode NR is a powerful tool for characterizing dynamic processes in electroactive films.
- The study provides detailed insights into film growth mechanisms and solvent interactions.
- Revealed complex speciation and dissolution pathways in metal deposition/dissolution relevant to energy storage and catalysis.
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