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Related Experiment Video

Updated: Jul 18, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Published on: December 20, 2016

Sub-Tc electron transfer at the Hg-HTSC/liquid-electrolyte interface.

Stephen J Green1, Nicolas Le-Poul, Peter P Edwards

  • 1School of Chemistry, University of Exeter, Stocker Road, UK. Stephen.j.green@exeter.ac.uk

Journal of the American Chemical Society
|March 27, 2003
PubMed
Summary

This study electrochemically analyzed ferrocene on a high-temperature superconductor. No change in electron transfer was observed at the superconducting transition, indicating superconductivity does not impact this reaction.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • High-temperature superconductors, particularly mercury-based ones, present unique electronic properties.
  • Understanding electron transfer at superconducting interfaces is crucial for novel electronic applications.
  • Ferrocene derivatives are widely used in electrochemical studies as redox probes.

Purpose of the Study:

  • To investigate the electron transfer kinetics of ferrocene adsorbed on a Hg-based high-temperature superconductor.
  • To determine the influence of the superconducting transition on electron transfer rates.
  • To establish a method for studying electrochemistry on high-Tc materials.

Main Methods:

  • Cyclic voltammetry was employed to study ferrocene (CpFeCpCO2(CH2)8SH) adsorbed on Hg0.8Re0.2Ba2Ca2Cu3O10 via a silver film.
  • Kinetic analysis using Marcus density-of-states theory was performed.
  • Arrhenius plots were used to analyze rate constants across the superconducting transition temperature (Tc).

Main Results:

  • Standard heterogeneous rate constants (k degrees) for ferrocene/ferricinium electron transfer were determined.
  • The rate constant at 273 K was found to be 357 s-1, 10-fold lower than at metal electrodes.
  • The reorganizational energy (0.92 eV) at the superconductor interface was similar to that at metal interfaces.
  • No effect of superconductivity onset on electron transfer rate was observed; the Arrhenius plot remained linear through Tc.

Conclusions:

  • This work represents the first sub-Tc electrochemistry on a Hg-based superconductor.
  • Electron transfer rates are not affected by the superconducting state in this system.
  • This methodology facilitates routine electrochemical studies on high-Tc superconductors, enabling their use as probes of the superconducting state.