What is a Solid Oxide Fuel Cell?

In the field of electricity, there are so many concepts and objects that you need to get familiar to, and one of these is the solid oxide fuel cell, also known as SOFC. SOFC is basically a type of electrochemical device designed to produce electricity from fuel oxidation. It features a ceramic or solid oxide electrolyte. Long-term stability, high efficiency, fuel flexibility, low cost and low emissions are just some of the benefits that we can get from using solid oxide fuel cells. On the downside, SOFC has a high operating temperature that can lead to longer start-ups, chemical and even mechanical compatibility problems.

SOFCs are fuel cells that are characterized by using solid oxide as their electrolyte to handle negative oxygen ions from the cathode and transfer them to the anode. On the anode, electrochemical oxygen ions oxidation takes place with carbon monoxide or hydrogen. In the more recent years, proton-conducting SOFCs, also referred as PC-SOFC, are being developed in order to carry protons to the electrolyte in place of the oxygen ions. This was done to decrease the temperature as compared to using traditional SOFCs.

Solid oxide fuel cells work at extremely high temperatures ranging from 500 to 1000 degrees Celsius. SOFCs do not need platinum catalysts at these temperatures. The chances to incur sulfur poisoning is possible when using SOFCs , and so the sulfur content must be removed first before it enters the cell with the use of adsorbent beds or other materials.

Light hydrocarbon fuels like propane, butane and methane can be internally created within the anode at high temperatures. The SOFCs can be fueled as well by recreating heavier hydrocarbons like diesel, jet fuel, biofuel and gasoline. Mixtures of carbon monoxide, hydrogen, steam, methane and carbon dioxide are the reformates formed by the reaction of the hydrocarbon fuels with steam or air in the upstream device within the SOFC’s anode C. The power systems of the fuel cell can level up the efficiency with the use of heat from the exothermic electrochemical oxidation.

With these fuel cells, people can have a wide selection of applications from auxiliary power units in cars and other vehicles to power generation to create 100W to 2 MW output. Unlike other fuel cells, SOFCs have a number of geometries. These are the planar fuel cell (sandwich type geometry), tubular geometry and the modified planar fuel cell. These fuels cells feature good designs that serve the primary purpose of creating energy or electricity.