title: High-Performance Protonic Ceramic Fuel Cells with Thin-Film Yttrium-Doped Barium Cerate-Zirconate Electrolytes on Compositionally Gradient Anodes.
abstract: In this study, we used a compositionally gradient anode functional layer (AFL) consisting of Ni-BaCe(0.5)Zr(0.35)Y(0.15)O(3-δ) (BCZY) with increasing BCZY contents toward the electrolyte-anode interface for high-performance protonic ceramic fuel cells. It is identified that conventional homogeneous AFLs fail to stably accommodate a thin film of BCZY electrolyte. In contrast, a dense 2 μm thick BCZY electrolyte was successfully deposited onto the proposed gradient AFL with improved adhesion. A fuel cell containing this thin electrolyte showed a promising maximum peak power density of 635 mW cm(-2) at 600 °C, with an open-circuit voltage of over 1 V. Impedance analysis confirmed that minimizing the electrolyte thickness is essential for achieving a high power output, suggesting that the anode structure is important in stably accommodating thin electrolytes.
authors.affiliation: School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.|High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology (KIST) , 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.
authors.forename: Kiho
authors.initials: K
authors.lastname: Bae
authors.affiliation: Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), KIST Campus , 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.
authors.forename: Sewook
authors.initials: S
authors.lastname: Lee
authors.affiliation: School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
authors.forename: Dong Young
authors.initials: DY
authors.lastname: Jang
authors.affiliation: School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
authors.forename: Hyun Joong
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hunhyeong
authors.initials: H
authors.lastname: Lee
authors.forename: Dongwook
authors.initials: D
authors.lastname: Shin
authors.affiliation: High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology (KIST) , 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.|Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), KIST Campus , 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Son
authors.affiliation: School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
authors.forename: Joon Hyung
authors.initials: JH
authors.lastname: Shim
keywords: gradient anode functional layer; low-temperature performance; protonic ceramic fuel cells; thin-film electrolytes; yttrium-doped barium cerate−zirconate