Baofeng Tu, Aokai Sun, Xiaojing Wang, Huiying Qi, Tonghuan Zhang, Peng Qiu, Di Liu
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引用次数: 0
Abstract
The development of highly active cathode is crucial to promote the electrochemical performance of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Here, it is reported the cobalt and/or iron ions as dopants into Ba(Zr, Y)O3-δ with the nominal chemical formulae of BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY), BaCo0.8Zr0.1Y0.1O3-δ (BCZY), and BaFe0.8Zr0.1Y0.1O3-δ (BFZY), which all form the main cubic perovskites in addition to a small amount of co-assembled hexagonal D-Ba(Co, Fe)O3-δ, D-BaCoO3-δ, and D-BaFeO3-δ under the same preparing condition. Among three samples, BCZY composite shows the highest capacity of O2 adsorption, lower thermal expansion coefficient (19.1 × 10−6 K−1), and highest electrical conductivity of 2.73 S cm−1 (750 °C). The symmetric cell with BCZY composite cathode exhibits excellent ORR activity with the lowest area specific resistance of 0.10 Ω cm2 at 700 °C, which is 0.71 and 0.67 times those of BCFZY composite and BFZY composite cathodes. Accordingly, the single cell with BCZY composite cathode shows the lowest RP of 0.16 Ω cm2 and the highest peak power density of 2.24 W cm2 at 700 °C. The distribution of relaxation times (DRT) analysis reveals that BCZY composite cathode shows the superior surficial oxygen exchange and charge transfer activity.
期刊介绍：
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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