At high temperatures platinum and rhodium are used, but at moderate temperatures, iron may be used.  
Common uses of this mechanism include converting heat from kerosene into power for radios in remote areas and detecting small amounts of heat exchange in enzymes.  At high temperatures platinum and rhodium are used, but at moderate temperatures, iron may be used.  It states that if two wires of different materials are joined at their ends and one end is maintained at a higher temperature than the other, a voltage difference will arise, and an electric current will exist between the hot and the cold junctions.  FTP, name this physical effect, an analogue of the Peltier effect.
Common uses of this mechanism include converting heat from kerosene into power for radios in remote areas and detecting small amounts of heat exchange in enzymes.  
Seebeck Effect