The design and development of an evaluation system for redox characteristics of anode supported SOFCS using in-situ acoustic emission and electrochemical technique

Shinichi Hashimoto, H. Watanabe, T. Sakamoto, Tatsuya Kawada, Keiji Yashiro, J. Mizusaki, K. Kumada, D. Changsheng, Kazuhisa Sato, Toshiyuki Hashida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this study, a redox evaluation system for anode supported SOFCs using in-situ acoustic emission (AE) and electrochemical technique has been developed. The system consists of a gas blending unit, moisture controlling unit, AE cell evaluation probe, gas cooling exhaust, electrochemical cell test system and AE signal measurement system. The anode supported coin cells, which have the same thickness dimension as practical SOFCs have, can be evaluated under temperature and atmosphere controlled conditions. The oxygen partial pressure in the anodic atmospheres can be gradually controlled from air to reducing atmosphere using the gas blending unit which is connected to 6 gas cylinders. Humidity in the anodic atmospheres can be controlled by moisture controlling unit which consists of 2 bubblers form 0.86% (5°C saturation) up to 80% (94°C saturation). Redox process of the anode can be simulated in this system by controlled three oxidation modes, i.e. O 2 gas oxidation, steam oxidation and electrochemical oxidation, which correspond to actual troubles, i.e. gas leakage, degradation of downstream and fuel depletion, respectively. An AE transducer can monitor the cell condition via an inner tube for a guide of exhaust from the cathode. Redox cell test for the anode supported coin cell has been examined at 770°C using this system. After the reduction of the anode substrate in moist H 2 , current 0.5Acm -2 loaded to the cell. And then H 2 gas concentration had been reduced by stages. The cell voltage was down to below -6V after H 2 gas concentration was reduced to pH 2 =2%. This drastic cell voltage drop and AE signal generation occurred at the same time. It is considered that Ni re-oxidation with fracture started at this time. Local delamination between anode and electrolyte, and also cracks at the electrolyte and cathode were observed after redox test. It was confirmed that AE sensing is effective for redox evaluation.

Original languageEnglish
Title of host publicationASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages521-525
Number of pages5
ISBN (Print)9780791844823
DOIs
Publication statusPublished - 2012 Jan 1
EventASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2012 Collocated with the ASME 2012 6th International Conference on Energy Sustainability - San Diego, CA, United States
Duration: 2012 Jul 232012 Jul 26

Publication series

NameASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012

Other

OtherASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2012 Collocated with the ASME 2012 6th International Conference on Energy Sustainability
CountryUnited States
CitySan Diego, CA
Period12/7/2312/7/26

ASJC Scopus subject areas

  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

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    Hashimoto, S., Watanabe, H., Sakamoto, T., Kawada, T., Yashiro, K., Mizusaki, J., Kumada, K., Changsheng, D., Sato, K., & Hashida, T. (2012). The design and development of an evaluation system for redox characteristics of anode supported SOFCS using in-situ acoustic emission and electrochemical technique. In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012 (pp. 521-525). (ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FuelCell2012-91156