Supplementary information files for: Fast ion-conductive electrolyte based on a doped LaAlO₃ with an amorphous surface layer for low-temperature solid oxide fuel cells

Supplementary files for article: Fast ion-conductive electrolyte based on a doped LaAlO₃ with an amorphous surface layer for low-temperature solid oxide fuel cells
Ion transport in solid oxide electrolytes is a key process involved in advanced green energy conversion devices such as solid oxide fuel cells (SOFCs). Conventional SOFC electrolytes require a high operational temperature (over 700 °C) to maintain considerable bulk and grain boundary diffusion of the ions to enable sufficient ionic conductivity for efficient fuel cell operation. The present study explores a novel ion conduction expressway in an amorphous/crystalline heterostructure, La_0·8Sr_0·2Al_0·8Zn_0·2O_3-δ (LSAZ), which can boost the mobility of ions at a relatively low temperature (450–550 °C) for SOFCs. The LSAZ heterostructure includes an insulating perovskite core and a superionic-conducting amorphous surface layer. This electrolyte exhibits a superior conductivity of 0.319 S cm⁻¹ at 550 °C, and it is employed in a SOFC which demonstrates a remarkable performance of 1296 mW cm⁻² at 550 °C, which is 300 times higher than a SOFC with the LSAZ being densified at 1400 °C for 10 h. A superionic conducting amorphous surface layer enriched by high oxygen vacancy defects facilitates ionic conduction along the grain boundary and interfaces between the nanoparticles of LSAZ. Our finding provides an efficient way to design advanced highly conductive electrolytes for solid oxide fuel cells to be operated at reduced temperatures.

论文补充材料：面向低温固体氧化物燃料电池的、基于带有无定形表面层的掺杂LaAlO₃的快离子导电电解质

固体氧化物电解质中的离子输运是固体氧化物燃料电池（Solid Oxide Fuel Cells，简称SOFCs）等先进绿色能源转换装置的核心过程。传统SOFC电解质需在700℃以上的高温工况下运行，以维持可观的体相与晶界离子扩散效率，从而获得足够的离子电导率以保障燃料电池高效运作。本研究在非晶/晶态异质结构La₀.₈Sr₀.₂Al₀.₈Zn₀.₂O₃₋δ（简称LSAZ）中开发了一种新型离子传导高速通路，可在450~550℃的相对低温下提升SOFC的离子迁移率。该LSAZ异质结构由绝缘性钙钛矿核与超离子导电型无定形表面层构成。该电解质在550℃下展现出0.319 S·cm⁻¹的优异电导率；将其应用于SOFC后，该电池在550℃下实现了1296 mW·cm⁻²的卓越功率密度，其性能比采用经1400℃烧结10 h致密化的LSAZ电解质的SOFC高出300倍。富含高浓度氧空位缺陷的超离子导电无定形表面层，可促进LSAZ纳米颗粒的晶界与界面处的离子传导。本研究成果为面向低温运行的高性能固体氧化物燃料电池开发高电导率电解质提供了高效可行的设计思路。

搜集汇总

背景与挑战

背景概述

该数据集提供关于低温固体氧化物燃料电池（SOFCs）中快速离子导电电解质的补充信息文件，重点研究了一种基于掺杂LaAlO3并具有非晶表面层的La0·8Sr0·2Al0·8Zn0·2O3-δ（LSAZ）异质结构电解质。该电解质通过非晶表面层增强离子传导，在550°C下实现0.319 S cm−1的高电导率和1296 mW cm−2的电池性能，显著降低了SOFCs的运行温度（450–550°C），为低温高效能源转换设备提供了新设计思路。