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A Bulk‑Heterostructure Nanocomposite electrolyte of Ce_(0.8)Sm_(0.2)O_(2‑δ)-SrTiO_(3) for Low‑Temperature Solid Oxide Fuel Cells

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Nano-Micro Letters 2021年第3期13卷 66-79页

作者： Yixiao Cai Yang Chen Muhammad Akbar Bin Jin Zhengwen Tu Naveed Mushtaq Baoyuan Wang Xiangyang Qu Chen Xia Yizhong Huang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Key Laboratory of High Performance Fibers and ProductsEngineering Research Center of Technical TextilesMinistry of EducationCollege of Materials Science and EngineeringDonghua University201620 ShanghaiPeople’s Republic of China Key Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province Faculty of Physics and Electronic ScienceHubei UniversityWuhan 430062HubeiPeople’s Republic of China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Republic of Singapore

Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite,heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells(sofcs).However,so far,the practical uses of such promising material have failed to materialize in sofcs due to the short circuit risk caused by *** this study,a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3(SDC–STO)are developed in a new bulk-heterostructure form and evaluated as *** prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550°C for the optimal composition of 4SDC–*** electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm^−1 at 450–550°C,which shows remarkable enhancement compared to that of simplex *** AC impedance analysis,it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior ***,a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO *** findings thus indicate a new insight to design electrolytes for low-temperature sofcs.

关键词： Bulk-heterostructure sofc electrolyte Ionic conductivity Schottky junction Work function

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