Kim, Junseok Yun, Jiwon Lee, Wanjae Kim, Do-Hyeong Guha, Puspendu Hwang, Jin-Ha Kwon, Deok-Hwang Yang, Sungeun Lee, Jong-Ho Yoon, Kyung Joong Son, Ji-Won Nahm, Sahn Choi, Sihyuk Ji, Ho-Il 2024-05-02T05:00:03Z 2024-05-02T05:00:03Z 2024-05-02 2024-07 1614-6832 https://pubs.kist.re.kr/handle/201004/149779 The proton-conducting oxides, widely employed as electrolytes in ceramic electrochemical cells, exhibit remarkable proton conductivity that facilitates efficient energy conversion processes. However, their inherent refractory nature poses a challenge in producing chemically stoichiometric and physically dense electrolytes within devices. Here a novel approach is presented, dual-phase reaction sintering, which can overcome the inherent low sintering ability of the representative BaCeO3-delta-BaZrO3-delta proton conducting oxides. This approach involves the simultaneous transformation of a two-phase mixture (comprising fast-sintering and slow-sintering phases) into a complete single-phase solid solution compound, along with the densification of the electrolyte, all accomplished within a single-step heating cycle. During the dual-phase reaction sintering process, the grains of the fast-sintering phase experience rapid growth owing to their intrinsic superior sintering ability. Additionally, this growth is augmented by the Ostwald ripening behavior manifested by the smaller slow-sintering phase. This synergistic strategy is validated using BaCe0.4Zr0.4Y0.1Yb0.1O3-delta, and its applicability in electrochemical cells is demonstrated, resulting in a significant enhancement in performance. These findings offer insights into streamlining the preparation of refractory ion-conducting ceramic electrolytes while maintaining their intrinsic properties for practical applications. A dual-phase reaction sintering of the highly refractory proton-conducting oxide BaCe0.4Zr0.4Y0.1Yb0.1O3-delta enables the achievement of full-density electrolyte at a lower temperature of 1400 degrees C, resulting in a twofold increase in electrochemical performance of protonic ceramic cells. image English Wiley-VCH Verlag Dual-Phase Reaction Sintering for Overcoming the Inherent Sintering Ability of Refractory Electrolytes in Protonic Ceramic Cells Article 10.1002/aenm.202400787 1 Advanced Energy Materials, v.14, no.26 Advanced Energy Materials 14 26 N scie scopus 001204066500001 2-s2.0-85190508004 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article DOPED BARIUM ZIRCONATE POWER-DENSITY STABILITY COKING SULFUR dual-phase reaction sintering proton conducting oxide protonic ceramic cells sintering ability