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This paper compares the electrical performance and impedance spectrum of two commercial solid oxide fuel cells (SOFCs) from the Institute of Nuclear Energy Research.

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Abstract

A solid oxide fuel cell (SOFC), which is a kind of fuel cell (FC) converting chemical energy into electricity directly without mechanical parts, has potential for the clean and efficient power generation from a wide variety of fuels ranging from hydrocarbons to renewables and coal-derived fuels. The Institute of Nuclear Energy Research has been committed to developing the SOFC technology since 2003 and the cell test is one of the working items in the project. Cells are the most important components in an SOFC stack, which are responsible for the electrical output functioning, as the heart in the human body, to the stack. Before stacking, it is essential to examine and evaluate the electrical performance of the cells that could be used in our stacks. There are two commercial cells tested in this paper. For both cell A, an anode supported cell, and cell B, an electrolyte supported cell, the cells with a lower open circuit voltage at a higher operating temperature are contributed by the Nernst equation. The I-V curve for a lower operating temperature with a steeper slope at the low current zone is credited to the increase of activation polarization from the triple phase boundary. Comparison between cell A and cell B, the electrical performance of cell A is better than that of cell B due to cell A possessing a lower total resistance at the same operating temperature.

Key findings

  • Cell A, an anode-supported cell, has a lower open circuit voltage at a higher operating temperature due to the Nernst equation.
  • The I-V curve for a lower operating temperature with a steeper slope at the low current zone is attributed to the increase of activation polarization from the triple phase boundary.
  • The impedance spectrum of both cells shows a significant decrease in impedance at higher operating temperatures.

Keywords

Solid oxide fuel cellChemical energyAnodeStack (abstract data type)Open-circuit voltageElectrolyte

Identifiers

DOI
10.1115/1.4027394
Journal
Journal of Fuel Cell Science and Technology
Year
2014