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Convion Ltd

Convion Ltd
Tekniikantie 12 ,
Espoo ,
02150
Finland
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Energy Conversion Device

Energy Conversion Device

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Fuel cell is an energy conversion device that converts fuel’s energy into electricity and heat by electrochemical combination of fuel with oxygen without combustion. Therefore efficiency of power generation is not limited by Carnot efficiency. Solid Oxide Fuel Cell is a type of fuel cell that has the highest efficiency of all conversion technologies in a single cycle and due to high operating temperature of SOFC’s, they are able to utilize both carbon monoxide as well as hydrogen for conversion. Also direct use of a hydrocarbon gas such as natural gas or biogas is possible due to internal reforming taking place at SOFC anodes.

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The solid oxide cell (SOC) technology of fuel cells can also be applied to high temperature electrolysis. In electrolysis, operating mode of the cells is switched in reverse to produce hydrogen from steam. Similarly like SOFC fuel cells, electrolysis by solid oxide technology (SOEC) is distinguished from competing technologies by higher efficiency of conversion and consequently lower energy consumption for hydrogen production.

Principle of Operation of A Solid Oxide Fuel Cell

A fuel cell consists of three main building blocks; an anode, a cathode, and an electrolyte placed in between of them. Fuel and air are supplied to the anode and the cathode side, respectively, where fuel gets electrochemically oxidized by oxygen ions moving from cathode side, creating DC current in an external circuit. In the process, water and carbon dioxide are formed as reaction products and heat is generated. Typically fuel cells are connected in a series of cells to form a cell stack in order to obtain higher voltage for practical applications.  

Principle of Operation of A Solid Oxide Electrolysis Cell

An electrolysis cell has the same structural elements as an SOFC cell but due to reversed polarity and direction of current, hydrogen electrode is called a cathode, and oxygen electrode an anode. Steam and air are supplied to the cathode and the anode side, respectively, and oxygen ion is stripped off of water molecules electrochemically, leaving hydrogen on the cathode side as a product gas.

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