Exchange current density of reversible solid oxide cell electrodes

Takuro Fukumoto, Naoki Endo, Katsuya Natsukoshi, Yuya Tachikawa, George F. Harrington, Stephen M. Lyth, Junko Matsuda, Kazunari Sasaki

Research output: Contribution to journalArticlepeer-review

8 Citations (SciVal)

Abstract

Reversible solid oxide cells (r-SOCs) can be operated in either solid oxide fuel cell or solid oxide electrolysis cell mode. They are expected to become important in the support of renewable energy due to their high efficiency for both power generation and hydrogen generation. The exchange current density is one of the most important parameters in the quantification of electrode performance in solid oxide cells. In this study, four different fuel electrodes and two different air electrodes are fabricated using different materials and the microstructures are compared. The temperature, fuel humidification, and oxygen concentration at the air electrode are varied to obtain the apparent exchange current density for the different electrode materials. In contrast to ruthenium-and-gadolinia-doped ceria (Rh-GDC) as well as nickel-and-gadolinia-doped ceria (Ni-GDC) electrodes, significant differences in the apparent exchange current density were observed between electrolysis and fuel cell modes for the nickel-scandia-stabilized zirconia (Ni-ScSZ) cermet. Variation of gas concentration revealed that surface adsorption sites were almost completely vacant for all these electrodes. The apparent exchange current densities obtained in this study are useful as a parameter for simulation of the internal properties of r-SOCs.

Original languageEnglish
Pages (from-to)16626-16639
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number37
Early online date13 Apr 2022
DOIs
Publication statusPublished - 30 Apr 2022

Bibliographical note

Funding Information:
A part of this study was supported by “ Research and Development Program for Promoting Innovative Clean Energy Technologies Through International Collaboration ” of the New Energy and Industrial Technology Development Organization (NEDO) (Contract No. 20001460-0 ). Collaborative support by Prof. H. L. Tuller, Prof. B. Yildiz, and Prof. J. L. M. Rupp at Massachusetts Institute of Technology (MIT) is gratefully acknowledged.

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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