Journal
JOURNAL OF POWER SOURCES
Volume 510, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230409
Keywords
Reversible protonic ceramic cells; Triple perovskite; Hydration; Triple-conducting oxide; Oxygen electrode
Funding
- Industrial Technology Innovation R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20203010030020]
- National Research Foundation of Korea [NRF-2021M313A1084830, NRF-2019H1D8A2106002]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20203010030020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019H1D8A2106002] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The use of highly defective material NBCFM in RPCCs' oxygen electrode achieves exceptional performance with high peak power densities and stability, helping to maximize the concentration of protons and oxygen vacancies.
The sluggish kinetics of oxygen electrode reactions represent one of the most significant barriers to realizing effective reversible protonic ceramic cells (RPCCs) at intermediate temperatures. Maximization of oxygen ion and proton conduction characteristics through hydration of electron-conducting solid oxides is a key technology that can solve this issue. We report on the exceptional performance at the oxygen electrode in RPCCs achieved using a highly defective material with excessive oxygen nonstoichiometry, Nd1.5Ba1.5CoFeMnO9-delta (NBCFM). Use of this material enables a superior reaction rate and conductivity during oxygen electrode reactions, maximizing the concentration of protons (with a high degree of hydration) as a guest ion as well as intrinsic oxygen vacancies. The peak power densities of this NBCFM cell are quite high, and a 1.4 V electrolyzing potential is achieved by NBCFM at -2.34 A.cm(-2) at 600 degrees C. Furthermore, these NBCFM cells are stable under prolonged (960 h) continuous operation at 600 degrees C.
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