Except renewable and hydro, all other power sources
cause pollution to environment and therefore a shift
to hydrogen economy from carbon economy is almost
essential. Solid Oxide Fuel Cell (SOFC) is a device that
directly converts chemical energy of fuel into
electricity via electrochemical reaction.
cell SOFC stack fabricated at CGCRI
The developed cells has the right kind of microstructure with ~ 15 ?m
thin gas-tight 8 mol% yttria stabilized zirconia (YSZ) electrolyte
sandwiched between a 1.5 ?m porous anode (Ni-YSZ) that provides
the mechanical support on one side and successive layers of ~ 10 ?m
thick La(Sr)MnO3 (LSM)-YSZ cathode functional layer (CFL) and ~ 50
?m thick LSM porous cathode layer (CL) on the other side.
The electrochemical characteristics of single cells have been tested in
the laboratory and high current density in the range 1.5 to 2.0 A/cm2
has been obtained at a cell voltage of 0.7V at 8000C which is at par
with International standard. Suitable glass-based sealants, an essential
component for SOFC stack fabrication has also been developed by
Based on an indigenous (CGCRI developed) counter-flow design with
internal gas manifold, SOFC stack components viz. cell holders,
grooved bi-polar plates, current collectors are also fabricated using
special grade ferritic steel.
Using the fabricated stack components, 10 cm x 10 cm single cells and
the developed glass sealants, short working SOFC stacks (upto 10-cell
level) operating between 750 to 8000C, has been demonstrated for the
first time in India. Till now a maximum power output of ~ 100 W has been
obtained from such a 10-cell stack. CGCRI is continuously working to
improve the performance of the working stacks.