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Temperature-Controllable Electrodes with a One-Parameter Calibration.

Sen Yang1, Xing Chen1, Zhen-Zhen Mi1

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ACS Sensors
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Summary

A new temperature-controllable disk electrode (TCDE) simplifies surface temperature calibration for chemical and biological sensors. This innovation reduces the need for frequent recalibrations across varying environmental temperatures, enhancing sensor reliability.

Keywords:
COMSOLelectrode surface temperatureheat transferheated electrodenumerical simulationstructural modeltemperature calibrationtemperature transfer coefficient

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Area of Science:

  • Electrochemistry
  • Sensor Technology
  • Materials Science

Background:

  • Electrically heated electrodes are crucial for chemical and biological sensors.
  • Existing electrodes often require frequent temperature calibration, especially with environmental changes.
  • Small electrode sizes in previous designs limit practical applications.

Purpose of the Study:

  • To develop a conventionally sized, temperature-controllable disk electrode (TCDE).
  • To introduce a simplified, one-parameter calibration method for electrode surface temperature (Ts).
  • To establish a reliable method for estimating Ts across a range of environmental temperatures.

Main Methods:

  • Fabrication of a 3-5 mm diameter TCDE.
  • Development of a structural model (Ts = Te + α(Th - Te)) for temperature calibration.
  • Numerical simulations (COMSOL) to determine the temperature transfer coefficient (α).
  • Experimental validation using gold, glassy carbon, and platinum electrodes.

Main Results:

  • The TCDE allows for accurate Ts estimation with errors below 1.5% across a 15.0-33.0 °C range.
  • A unique temperature transfer coefficient (α) simplifies calibration, dependent on electrode structure, materials, and solution.
  • A relationship was found between α and electrode dimensions (height H, radius R).
  • The impact of insulating material and cell radii on Ts was analyzed.

Conclusions:

  • TCDEs offer a robust platform for electrochemical and biological sensing.
  • The simplified calibration method enhances the practicality and reliability of heated electrodes.
  • Further research can optimize TCDE performance by considering solution thermal conductivity and structural parameters.