1989 Fiscal Year Final Research Report Summary

Design of cathode materials for ZrO2 electrolyte fuel cell

Research Project

Project/Area Number	63550517
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	金属材料(含表面処理・腐食防食)
Research Institution	TOHOKU UNIVERSITY
Principal Investigator	ECHIGOYA Jun-ichi Tohoku University, Faculty of Engineering Department of Materials Processing Associate Professor, 工学部, 助教授 (00005539)
Project Period (FY)	1988 – 1989
Keywords	Zirconia / Fuel cell / La-perovskite / bonding
Research Abstract	A sedes of solid solutions of La(Mn_<1-x> Ni_x)O_3 system has been prepared and investigated by x-ray diffraction, electron diffraction, electrical resistivity and thermal expansion coefficient measurement. Complete range of solid solution exists with face centered cubic structure. The electrical resistivities of La(Mn_<1-x> Ni_x)O_3 were quite low of order of 10^<-2> W cm at 1173K. The thermal expansion coefficients make minimum at the composition around x=0.4 and was the same value of 10mol% Y_2O_3-ZrO_2 at the composition of x=0.2. The bonding of La(Mn_<1-x> Ni_x)O_3 (x=2) with cubic ZrO_2 was performed at 1573k under the pressure of 2MPa for 127.8ks. The 'conventional' TEM image reveals that bonding is extremely good at the interface without any cracks and third phases. Above all, the La(Mn_<1-x> Ni_x)O3 (x=2) perovskite is the best cathode materials for ZrO_2 high temperature fuel cell.

(6 results)