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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Data for phase angle shift with frequency.

T Paul1, D Banerjee1, K Kargupta2

  • 1Department of Physics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India.

Data in Brief
|May 10, 2016
PubMed
Summary
This summary is machine-generated.

Phase angle shifts in phosphoric acid fuel cells were studied across various temperatures. Results show a peak phase angle shift at high humidifier temperatures, shifting to lower frequencies as temperature decreases.

Keywords:
Electrochemical reaction timeImpedance spectroscopyPhase anglePhosphoric acid fuel cell

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Understanding the electrochemical behavior of fuel cells is crucial for optimizing their performance.
  • Phase angle shifts between current and voltage are key indicators of dynamic processes within fuel cells.

Purpose of the Study:

  • To investigate the phase angle shift in a single phosphoric acid fuel cell (PAFC) as a function of frequency.
  • To analyze the influence of cell and humidifier temperatures on the observed phase angle shifts.
  • To estimate the electrochemical reaction time under varying humidifier temperatures.

Main Methods:

  • Utilized an electrochemical workbench to measure the phase angle shift between current and voltage.
  • Conducted experiments across a cell temperature range of 100°C to 160°C.
  • Varied the humidifier temperature from 40°C to 90°C while monitoring phase angle shifts and estimating reaction times.

Main Results:

  • A distinct peak in the phase angle shift was observed at higher humidifier temperatures.
  • The frequency at which this peak occurred shifted towards lower values as the humidifier temperature decreased.
  • Electrochemical reaction times were successfully estimated within the 50°C to 90°C humidifier temperature range.

Conclusions:

  • Humidifier temperature significantly impacts the phase angle shift characteristics of PAFCs.
  • The observed frequency-dependent phase angle shift provides insights into the cell's dynamic electrochemical response.
  • The findings contribute to a better understanding of PAFC operational dynamics and reaction kinetics.