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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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High-Performanced Cathode with a Two-Layered R-P Structure for Intermediate Temperature Solid Oxide Fuel Cells.

Daoming Huan1, Zhiquan Wang1, Zhenbin Wang1

  • 1CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, 230026 Anhui China.

ACS Applied Materials & Interfaces
|February 10, 2016
PubMed
Summary

New cobalt-substituted strontium iron oxide (SFCO) enhances intermediate temperature solid-oxide fuel cells (IT-SOFCs). This cathode material improves oxygen reduction kinetics, boosting power density and stability for cleaner energy solutions.

Keywords:
Ruddlesden−Popper oxidecathodedensity functional theorysolid oxide fuel cellssurface exchange coefficient

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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Intermediate temperature solid-oxide fuel cells (IT-SOFCs) offer high efficiency and fuel flexibility but are limited by slow oxygen reduction reaction (ORR) kinetics.
  • Sr3Fe2O7-δ (SFO) shows promise for oxygen ion conduction but has an inert surface, hindering ORR catalysis.

Purpose of the Study:

  • To develop a novel cathode material for IT-SOFCs with improved ORR kinetics.
  • To enhance the catalytic activity of SFO by addressing its surface limitations.

Main Methods:

  • Density functional theory (DFT) calculations to assess SFO's oxygen ion properties.
  • Synthesis and characterization of cobalt-substituted SFO (SFCO).
  • Electrochemical performance testing of IT-SOFCs using SFCO cathodes.

Main Results:

  • DFT indicated low oxygen ion formation energy but a significant diffusion barrier in SFO.
  • The stable SrO surface of SFO was found to be inert to O2 adsorption and dissociation.
  • SFCO cathodes achieved a peak power density of 685 mW cm⁻² at 650 °C, outperforming LSCF cathodes by 15%.
  • The SFCO-based cell demonstrated excellent stability over a 100-hour test at 200 mA cm⁻².

Conclusions:

  • Partial substitution of Co in SFO (SFCO) effectively increases surface vacancy concentration.
  • SFCO accelerates the oxygen adsorptive reduction reaction rate, significantly improving IT-SOFC performance.
  • SFCO represents a promising cathode material for efficient and stable IT-SOFC operation.