Perspective of perovskite-type oxides for proton conducting solid oxide fuel cells

Enhancing the sinterability and electrical properties of BaZr0.1Ce0.7Y0.2O3‐δ proton‐conducting ceramic electrolyte

“…Nevertheless, the traditional SOFC electrolyte fluorite-structured yttrium-stabilized zirconia (YSZ) runs in high temperatures (800°C-1000°C), thereby leading to serious problems in practical applications, such as high-temperature sealing, material compatibility, and fabricating cost. [3][4][5][6] The reduction in working temperature is a problem that researchers face in the commercialization of SOFC. [6][7][8] Lowering the working temperature directly resulted in serious increases in ohmic and polarization resistances of SOFC, especially the ohmic resistance that is the BZCY and LSGM electrolytes after sintering at 1400°C, 1450°C, 1500°C, and 1550°C for 10 h. The BL91 composite electrolyte exhibited higher relative densities and Vickers hardness and excellent electrical properties compared with those of the BZCY electrolyte.…”

“…[3][4][5][6] The reduction in working temperature is a problem that researchers face in the commercialization of SOFC. [6][7][8] Lowering the working temperature directly resulted in serious increases in ohmic and polarization resistances of SOFC, especially the ohmic resistance that is the BZCY and LSGM electrolytes after sintering at 1400°C, 1450°C, 1500°C, and 1550°C for 10 h. The BL91 composite electrolyte exhibited higher relative densities and Vickers hardness and excellent electrical properties compared with those of the BZCY electrolyte. A combined approach of equivalent circuit model and distribution of relaxation time analysis was used to distinguish the bulk and grain-boundary contributions to the total conductivity and electrode processes.…”

“…3,9 Thus, exploiting the available electrolyte with high oxygen-ion or proton conductivity operating in reduced-temperature SOFCs, such as CeO 2 -, LaGaO 3 -, Ba/SrCeO 3 -, and Ba/SrZrO 3 -based electrolytes, is crucial. 1,3,6,[10][11][12] Among the various electrolytes investigated, perovskite-type proton-conducting electrolytes are promising materials for reduced-temperature SOFC because of their low proton conduction activation energy (approximately 0.4-0.6 eV), good proton conductivity, and high fuel efficiency. 2,5,7,10 In particular, BaCeO 3 -and BaZrO 3 -based perovskite materials are the most popular and representative proton-conducting electrolytes.…”

“…The electrolyte plays a critical role in determining the operating temperature in SOFC. Nevertheless, the traditional SOFC electrolyte fluorite‐structured yttrium‐stabilized zirconia (YSZ) runs in high temperatures (800°C–1000°C), thereby leading to serious problems in practical applications, such as high‐temperature sealing, material compatibility, and fabricating cost 3‐6 . The reduction in working temperature is a problem that researchers face in the commercialization of SOFC 6‐8 .…”

Application of a clustered countercurrent-flow micro-channel reactor in the preparation of KMnF3perovskite for asymmetric supercapacitors

“…[13][14][15][16][17][18] Perovskite-type materials with the nominal formula of ABC 3 , where A is a lanthanide or alkali earth element and B is a valence-variable metal cation, have been widely studied as electrodes for solid fuel cells and supercapacitors on account of their inherent 3D diffusion channels and robust structure with intersectant orthogonal cavity chains. [19][20][21][22][23] Because of the considerable ionic essence of transition metal-uoride bonds and inherent high rate of ion diffusion, perovskite uorides have been considered as a promising candidate to replace perovskite oxides for electrochemical applications. 24,25 It has been reported that KCoF 3 demonstrates good electrochemical stability and energy storage capacity.…”