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抑制结构分层,提高固体氧化物电池的电化学性能
Jingzeng Cui1,2, Yuxuan Zhang1, Zhiwei Hu3
1Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.
Small methods
|April 30, 2024
概括
将 (CeO2) 纳入可逆固体氧化物电池 (rSOC) 电极可以通过稳定价值状态来防止接口分层. 这大大提高了rSOC的性能和耐用性,用于能源应用.
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
- 储能和能源转换 储能和能源转换
背景情况:
- 可逆固体氧化物电池 (rSOC) 对能量转换和储存具有前景.
- 传统的空气电极 (LSM,BSCF,PBCC) 在操作过程中遭受接口分层.
- 这种分层与通过微聚焦X射线吸收光谱学 (μ-XAS) 观察到的非均价值状态有关.
研究的目的:
- 制定一种策略,以减轻rSOC空气电极中的接口分层.
- 提高电化学性能和rSOCs的长期稳定性.
主要方法:
- 在传统的空气电极材料 (LSM,BSCF,PBCC) 中使用一方法将氧气空位丰富的CeO2纳入.
- 使用微聚焦X射线吸收光谱学 (μ-XAS) 分析电极价值状态.
- 电化学性能测试,包括650°C的长期稳定性测试.
主要成果:
- 加入CeO2导致了价值状态的均分布,减轻了结构分层.
- 与PBCC (0.907 mV h-1超过135小时) 相比,PBCC-CeO2电极在~500小时内显著降低了降解率 (0.095 mV h-1).
- 与PBCC相比,PBCC-CeO2的电解电流密度和最大功率密度大大增加,BSCF-CeO2和LSM-CeO2.2观察到类似的改善.
结论:
- 添加CeO2有效地稳定了电极结构,并减轻了rSOC中的分层.
- 这种方法显著提高了rSOCs的电化学性能和运行耐用性.
- 这些发现为推进rSOC技术的实际应用提供了可行的策略.
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