Constructing Robust and Efficient Ceramic Cells Air Electrodes Through Collaborative Optimization Bulk and Surface Phases

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ying Zhang, Yibei Wang, Zhilin Liu, Zhen Wang, Yaowen Wang, Youcheng Xiao, Bingbing Niu, Xiyang Wang, Wenquan Wang, Tianmin He
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Abstract

Slow reaction kinetics of air electrodes is a common problem faced by low-temperature (<650 °C) oxygen-ion conducting solid oxide fuel cells (O-SOFCs) and proton-conducting reversible proton ceramic cells (R-PCCs). Here, an innovative approach is proposed to design and prepare two efficient and durable Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF)-based nanocomposites through self-reconstruction strategy, which aim to optimize both the bulk and surface properties of electrode materials simultaneously. Specifically, the two nanocomposites with a nominal composition of Ba0.4Sr0.5Cs0.1Co0.7Fe0.2M0.1O3−δ (M═Ni, Zr) consisted of the major perovskite phase and surface-enriched NiO and BaZrO3 minor phases. When Ba0.4Sr0.5Cs0.1Co0.7Fe0.2Ni0.1O3−δ (BSCsCFNi) is used as an air electrode in O-SOFCs, the peak power density is 1.36 W cm−2 at 650 °C; while Ba0.4Sr0.5Cs0.1Co0.7Fe0.2Zr0.1O3−δ (BSCsCFZr) is used in R-PCCs, a peak power density of 1.24 W cm−2 and a current density of −1.98 A cm−2 (1.3 V) are achieved at 650 °C, and exhibits stable reversibility over 100 h. Theoretical calculations and experiments indicate that Cs+ doping enhances the bulk conduction of oxygen ions and protons; NiO nanoparticles enhance oxygen adsorption and surface exchange; BaZrO3 nanoparticles increase steam adsorption and hydration capacity. This study provides a new idea for designing efficient and durable air electrodes of ceramic cells.

Abstract Image

通过协同优化体相和表面相构建坚固高效的陶瓷电池空气电极
空气电极反应动力学慢是低温(<650°C)氧离子导电固体氧化物燃料电池(O-SOFCs)和质子导电可逆质子陶瓷电池(R-PCCs)面临的共同问题。本文提出了一种创新的方法,通过自重构策略设计和制备两种高效耐用的ba0.5 sr0.5 co0.8 fe0.3 2o3−δ (BSCF)基纳米复合材料,旨在同时优化电极材料的体积和表面性能。具体来说,这两种纳米复合材料的标称组成为Ba0.4Sr0.5Cs0.1Co0.7Fe0.2M0.1O3−δ (M = Ni, Zr),主要由钙钛矿相和表面富集的NiO和BaZrO3小相组成。以Ba0.4Sr0.5Cs0.1Co0.7Fe0.2Ni0.1O3−δ (BSCsCFNi)作为空气电极制备o - sofc时,650℃时的峰值功率密度为1.36 W cm−2;使用Ba0.4Sr0.5Cs0.1Co0.7Fe0.2Zr0.1O3−δ (BSCsCFZr)的R-PCCs在650℃下可获得1.24 W cm−2的峰值功率密度和- 1.98 a cm−2 (1.3 V)的电流密度,且在100 h内具有稳定的可逆性。理论计算和实验表明,Cs+的掺杂增强了氧离子和质子的体传导;纳米NiO增强氧吸附和表面交换;BaZrO3纳米颗粒提高了蒸汽吸附和水化能力。该研究为设计高效耐用的陶瓷电池空气电极提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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