Effect of doping strategy on electrochemical performance of grain boundaries of complex perovskite proton conductor Ba3Ca1.18Nb1.82O−δ

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-12-15 DOI:10.1016/j.ceramint.2024.10.076

Xinyu Cai, Ying Li, Lixin Yang, Xi Wang

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Abstract

In this study, the electrical conductivity and electrochemical performance of Ba₃Ca_1.18Nb_1.82O_9−δwere improved by substituting niobium (Nb) element with bismuth (Bi) and ytterbium (Yb) elements. Three different proton conductors, namely, Ba₃Ca_1.18Nb_1.82O_9−δ (BCN), Ba₃Ca_1.18Nb_1.72Bi_0.1O_9−δ (BCNB), and Ba₃Ca_1.18Nb_1.72Yb_0.1O_9−δ (BCNYb) were prepared by solid state sintering. The electrochemical performance of BCNYb was found to be the best at 400–800 °C in the wet atmosphere. Their ion transport properties were studied by using the defect equilibrium model. The results show the improvement in proton conductivity of BCNYb. Analysis of distribution of relaxation time reveals the improvement in the grain boundary properties of BCNYb. Single cells were prepared with BCN, BCNB, and BCNYb electrolytes, and the performance of the resulting fuel cells was tested. The BCNYb-based fuel cell shows excellent electrochemical performance, indicating its promising potential as a solid-state electrolyte with excellent properties.

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掺杂策略对复合过氧化物质子导体 Ba3Ca1.18Nb1.82O-δ 晶界电化学性能的影响

本研究通过用铋（Bi）和镱（Yb）元素替代铌（Nb）元素，提高了 Ba3Ca1.18Nb1.82O9-δ 的导电性和电化学性能。通过固态烧结制备了三种不同的质子导体，即 Ba3Ca1.18Nb1.8O9-δ（BCN）、Ba3Ca1.18Nb1.72Bi0.1O9-δ（BCNB）和 Ba3Ca1.18Nb1.72Yb0.1O9-δ（BCNYb）。在 400-800 °C 的湿气氛中，BCNYb 的电化学性能最佳。利用缺陷平衡模型研究了它们的离子传输特性。结果表明，BCNYb 的质子传导性得到了改善。对弛豫时间分布的分析表明，BCNYb 的晶界特性得到了改善。使用 BCN、BCNB 和 BCNYb 电解质制备了单电池，并测试了所得燃料电池的性能。基于 BCNYb 的燃料电池显示出优异的电化学性能，表明其作为具有优异性能的固态电解质的潜力巨大。

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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.