Journal
JOURNAL OF POWER SOURCES
Volume 531, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231320
Keywords
Thin film solid oxide fuel cells; Anodized aluminum oxide; Ni-GDC anode; Glancing angle deposition; Columnar growth; In-plane electrical conduction
Funding
- Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT(MSIT) [2019M3E6A1064695]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019R1A4A1025848]
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [NRF-2019R1G1A1100393]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20000525]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20000525] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019M3E6A1064695] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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AAO-supported Ni-GDC thin-film anodes fabricated by thin film deposition techniques exhibit exceptional performances at low temperature.
Solid Oxide Fuel cells (SOFCs) operating at low temperature (450-600 degrees C) have been investigated in order to achieve rapid on/off, improved long-term stability and a wide selection of low cost materials, but decrease in ionic conductivity and slowed electrode kinetics still remain as challenges. Anodized aluminum oxide (AAO)-supported thin-film SOFCs (TF-SOFCs) fabricated by thin film deposition techniques exhibit exceptional performances at low temperature owing to extremely reduced electrolyte thickness and nanostructured electrodes. However, limited electrical conduction in anodes on AAO coerces metallic anodes and studies on cermet anodes are still insufficient. In this work, nickel-gadolinium doped ceria (Ni-GDC) thin-film anodes with different thickness are co-sputtered on AAOs with subsequently sputter-deposited yttria-stabilized zirconia electrolyte and platinum cathode. The TF-SOFCs represent maximum power densities of 223, 281, 353 and 177 mW/cm(2) at 500 degrees C for Ni-GDC thickness of 300, 500, 800, 1000 nm, respectively. 800 nm thickness shows the best performance since porosity is maximized by columnar growth behavior during sputtering and lateral electrical conduction is consistently improved as the anode becomes thicker, which is confirmed by electrochemical impedance spectroscopy, field-emission scanning electron microscopy, and focused ion beam. Transmission electron microscopy/energy-dispersive X-ray spectroscopy are utilized to get structural and chemical information.
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