Residual Stress Analysis in Lanthanum Gallate-Based Cells before and after Fuel Cell Operation

The distribution of residual stress in cells with the practical size of 120 mm diameter was measured by X-ray diffraction utilizing synchrotron radiation at Super Photon ring 8 GeV (SPring-8). The residual stress was determined by the constant penetration depth method. When NiO-samaria-doped ceria (SDC) was sintered on (La,Sr)(Ga,Mg,Co)O 3-δ (LSGMC), the tensile stresses resided in NiO and SDC, and the compressive stress resided in LSGMC. The reduction of the anode by hydrogen decreased tensile stresses in the anode. The residual stresses in the electrodes did not change at any X-ray penetration depth. The sintering of the cathode slightly affected the residual stresses of the cells.