Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
This paper presents an acoustic emission (AE) method for detecting mechanical damage in anode-supported cells (ASCs) during redox cycle operation. In electrochemical oxidation treatments, cyclic power generation tests were conducted. After H2 supply was stopped, the cell voltage was controlled during the power generation tests. The cell voltage was set to be 80% of the present open circuit voltage (OCV) and the current was monitored for 300 sec. After the power generation test, the cell was switched off to the open circuit. The above operation was repeated cyclically until the OCV unstably decreased and became uncontrollable. The OCV started to decrease unstably and the AE activity was enhanced rapidly after 14 cycle tests of power generation. The OCV decreased and eventually reached 0V, suggesting that the electrochemical oxidation caused fully mechanical damage and cracking in the cells. The electrochemical evaluation performed concurrently with the redox treatments demonstrated the validity and significance of AE monitoring for detecting mechanical damages in SOFCs.
