Local structural & electrical properties of Ce 0.85Sr0.075Sm0.075O2-δ- Ba0.50Sr0.50CeO3 nanocomposite solid electrolyte (SOEs) for LT-SOFCS

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.201

Kuldip Bhongale , Smita Acharya , Shradhha Shirbhate

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引用次数: 0

Abstract

The primary goal of this effort intended the development of effective composite solid electrolytes (SOEs) for low-temperature SOFCs (solid oxide fuel cells). For LT-SOFCs, SOEs that have elevated ionic conductivity at the low-temperature side i.e 250 - 500 °C, is very crucial. Hydrothermal synthesis method was used to synthesize fluorite phase Sr and Sm double doped ceria, (DCO) i.e Ce_0.85Sr_0.075Sm_0.075O_2-δ, while the sol-gel combustion approach was used to produce Sr doped Barium cerate Ba_0.5Sr_0.5CeO₃(BSCO) perovskite-based systems. Using additive BSCO with varying nanocomposition, a series of distinct bi-phase SOEs are produced by combining DCO. X-ray diffraction (XRD) confirm the composite's structure and detailed structural data was collected from Rietveld refinement of raw XRD data. Scanning electron microscopy (SEM) has been used to analyze microstructural data, showing gas-tight densification of composite-based materials. Using room temperature Raman Spectroscopy, the effects of the BSCO additive on the local structure of double-doped ceria were methodically investigated. In nanocomposites, the presence of intrinsic and extrinsic oxygen vacancies ordering is readily visible by Raman spectroscopy. Ionic conductivity has been determined for each gas-tight dense composite material and electrical properties were examined using impedance spectroscopy across a temperature range of 250–500ᵒC. At 500 °C, the BSCO-DCO-10 system demonstrated a maximum conductivity of 6.338 x 10⁻² S/cm, in H₂/humid atmosphere surpassing that of the single-phase DCO system.

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Ce 0.85Sr0.075Sm0.075O2-δ- Ba0.50Sr0.50CeO3纳米复合固体电解质（soe）的局部结构和电学性能

这项工作的主要目标是为低温sofc（固体氧化物燃料电池）开发有效的复合固体电解质（soe）。对于LT-SOFCs，在低温侧（250 - 500°C）具有较高离子电导率的soe是非常重要的。采用水热合成法合成了荧光石相Sr和Sm双掺杂氧化铈（DCO） Ce0.85Sr0.075Sm0.075O2-δ，采用溶胶-凝胶燃烧法制备了Sr掺杂钡铈Ba0.5Sr0.5CeO3（BSCO）钙钛矿基体系。采用不同纳米组成的添加剂BSCO，通过DCO的结合制备了一系列不同的双相soe。x射线衍射（XRD）证实了复合材料的结构，并对原始XRD数据进行了Rietveld细化，获得了详细的结构数据。利用扫描电子显微镜（SEM）分析了复合基材料的微观结构数据，显示了气密化。利用室温拉曼光谱，系统地研究了BSCO添加剂对双掺杂氧化铈局部结构的影响。在纳米复合材料中，通过拉曼光谱可以很容易地观察到内在和外在的氧空位排序。测定了每种气密复合材料的离子电导率，并使用阻抗谱在250-500℃的温度范围内检测了其电性能。在500°C时，BSCO-DCO-10体系的最大电导率为6.338 x 10−2 S/cm，在H2/潮湿大气中优于单相DCO体系。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

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.