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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Thermal-expansion offset for high-performance fuel cell cathodes.

Yuan Zhang1, Bin Chen2,3, Daqin Guan1

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Researchers developed compatible solid oxide fuel cell electrodes by combining materials with different thermal expansion properties. This approach enhances stability and activity for efficient energy conversion.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Commercial development of solid oxide fuel cells faces challenges due to thermo-mechanical instability.
  • Internal strain gradients from mismatched thermal expansion cause fuel cell degradation, delamination, and fracture.

Purpose of the Study:

  • To achieve thermo-mechanical compatibility between solid oxide fuel cell components, specifically the cathode and electrolyte.
  • To enhance the stability and electrochemical activity of fuel cell electrodes.

Main Methods:

  • Utilized reactive sintering to combine a cobalt-based perovskite with a negative-thermal-expansion material.
  • Formed a composite electrode with tailored thermal expansion behavior matched to the electrolyte.
  • Investigated the formation of a new interphase and A-site deficiencies in the perovskite during calcination.

Main Results:

  • Developed a composite electrode exhibiting well-matched thermal expansion behavior with the electrolyte.
  • The composite electrode demonstrated high electrochemical activity and excellent stability.
  • Identified a new interphase and A-site deficiencies contributing to improved performance.

Conclusions:

  • Introducing a thermal-expansion offset via reactive sintering of negative-thermal-expansion materials is a viable strategy.
  • This approach offers a general method for developing fully compatible and highly active electrodes for solid oxide fuel cells.
  • Overcoming thermo-mechanical instability is key for advancing solid oxide fuel cell technology.