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通过兴奋剂来增强 δ-Bi₂O₃低温固体氧化物电化学电池的稳定性

Donghun Lee¹, Hyunseung Kim², Seung Jin Jeong³

¹Department of Mechanical Engineering, KAIST, Daejeon, 34141, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)

|June 9, 2025

概括

一种新的化物结构的δ-Bi2O3导体在600°C时提高了固体氧化物电化学电池 (SOC) 的性能. 这种材料提供了卓越的离子导电性和稳定性,用于高效的低温能量转换.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
能源转换能源转换

背景情况:

固体氧化物电化学电池 (SOC) 对环保能源转换具有前景,但受到高工作温度的限制.
商业化受到阻碍,因为缺乏耐用,活性材料用于低温SOC运行.
传统的材料,如Y-doped环,在降低温度下实现高导电性和稳定性方面面临着挑战.

研究的目的:

开发一种高稳定性和导电性离子导体,用于低温SOC运行.
为了提高 δ-Bi2O3 基材料的结构稳定性和离子导电性.
提高SOC在降低工作温度下的电化学性能.

主要方法:

基于δ-Bi2O3的新型离子导体的合成和表征,其中包含F-离子.
在600°C测量离子导电性,并评估长期稳定性.
密度函数理论 (DFT) 计算以阐明F-离子结合的机制.
将开发的材料集成到复合氧气电极中,用于SOC测试.

主要成果:

优化的F-doped δ-Bi2O3在600°C时达到0.228 S cm-1的离子导电率,比Y-doped基高70倍以上.
该材料在运行条件下表现出良好的长期稳定性.
DFT的计算证实了F-结合稳定了结构并提高了导电性.
使用新导体的SOC在燃料电池模式下达到0.98W cm-2,在电解模式下在600°C下在1.3V下达到0.63A cm-2.

结论:

在δ-Bi2O3中离子介导显著提高了低温SOC的结构稳定性和离子导电性.
开发的材料能够在燃料电池和电解模式下在600°C下实现卓越的电化学性能.
这项研究为设计高效,实用的SOC在降低温度下运行的先进材料提供了途径.

关键词:

比斯穆特氧化物是什么密度函数理论计算密度函数理论计算电解细胞是电解细胞.化物兴奋剂是用进行的.燃料电池是指燃料电池的使用方式.

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