@article{b7fbcac6402e49db83b93b9256125670,
title = "Protonic ceramic fuel cells with slurry-spin coated BaZr0.2Ce0.6Y0.1Yb0.1O3- δ thin-film electrolytes",
abstract = "In this study, we report the successful fabrication of thin-film proton ceramic fuel cells (PCFCs) using a slurry spin coating technique. BaZr0.2Ce0.6Y0.1Yb0.1O3-δ (BZCYYb) and PrBa0.5Sr0.5Co1.5Fe0.5O5+δ are used as the proton ceramic electrolyte and cathode material, respectively. All the active element layers, including the anode functional layers, electrolyte, and cathode, are fabricated by spin coating on the NiO-BZCYYb anode support pellet. The PCFCs exhibit reasonably high performance with peak power densities of 250–650 mW/cm2 at the intermediate temperature (IT) range of 500–600 °C, proving the cell production feasibility of spin coating. In this study, it is confirmed that the fabrication variables influence the morphological properties, such as grain sizes, demonstrating the improvement in charge transport rate and polarization performance of the cathode. The PCFCs also exhibit excellent long-term stability, with no apparent degradation for over 80 h. These results clearly show the spin coating method has great potential in the upcoming mass production of ceramic fuel cells, regarding its ease of manufacture and economy.",
keywords = "Ceramic fuel cell, Electrolyte, Protonic ceramic, Spin coating, Thin film",
author = "Kang, {Eun Heui} and Choi, {Hyeon Rak} and Park, {Jong Seon} and Kim, {Keun Hee} and Kim, {Dong Hwan} and Kiho Bae and Prinz, {Fritz B.} and Shim, {Joon Hyung}",
note = "Funding Information: This study confirmed the adequate performance of PCFCs fabricated by the slurry spin coating method. BZCYYb and PBSCF were used as the proton ceramic electrolyte and cathode material, respectively. All the layers, including the anode AFL, electrolyte, and cathode atop the NiO-BZCYYb anode support pellet were fabricated by spin coating. The specimen fabricated by our slurry sources exhibited reasonably good performance in the cell test in the IT range. The highest power was measured as 250–650 mW/cm 2 at 500–600 °C from the PCFC with a 7.6 μm thick BZCYYb electrolyte. The phase and morphology were identified and implemented as desired. We varied the spin speed from 3000 rpm to 8000 rpm in the processing of the BZCYYb electrolyte membrane to determine its influence on the morphology and properties of the electrolyte. It was found that higher spin speed resulted in thinner membranes for the same number of spin coating cycles. Spin speed not only influenced the thickness of the membrane, but also morphological properties such as grain structure. Our cell test demonstrated improved performance of the charge transport and electrode processes, such as charge transfer at the electrode-electrolyte interface or TPBs. This conclusion is supported by the EIS and Bode analyses. The performance difference between the 3000 rpm and 6000 rpm cells was considerably greater than that between the 6000 rpm and 8000 rpm cells in terms of fuel cell power and ohmic/polarization impedances, despite the slight change in film thickness. This can be attributed to the increase in the grain boundary population in the layers fabricated at a lower speed spin, i.e., 3000 rpm, as the grain boundary has been reported to significantly change the electrochemical properties of proton ceramic electrolytes. The PCFCs fabricated by spin coating exhibited excellent long-term stability, demonstrating no distinct degradation of cell power during galvanostatic operation (150 mA/cm 2 ) at 500 °C. This result verifies the feasibility of the spin coating method for the production of practical and reliable PCFCs that can operate in the IT range. Funding Information: This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea (No. 20173010032170 ). ",
year = "2020",
month = jul,
day = "31",
doi = "10.1016/j.jpowsour.2020.228254",
language = "English",
volume = "465",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",
}