高性能燃料电池阴极的热膨胀偏移
Yuan Zhang1, Bin Chen2,3, Daqin Guan1
1Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, China.
Nature
|March 11, 2021
概括
研究人员通过结合具有不同热膨胀特性的材料开发了兼容的固体氧化物燃料电池电极. 这种方法提高了能源转换效率的稳定性和活力.
科学领域:
- 材料科学
- 电化学
- 能源转换
背景情况:
- 由于热力学不稳定性,固体氧化物燃料电池的商业开发面临挑战.
- 由不匹配的热膨胀引起的内部应变梯度会导致燃料电池的降解,分层和断裂.
研究的目的:
- 为了实现固体氧化物燃料电池组件之间的热力学兼容性,特别是阴极和电解质.
- 提高燃料电池电极的稳定性和电化学活性.
主要方法:
- 使用反应性烧结将基矿与负热膨胀材料结合起来.
- 形成了一个复合电极与电解质相匹配的定制热膨胀行为.
- 研究了化过程中矿中新间相和A位缺陷的形成.
主要成果:
- 开发了一种复合电极,其热膨胀行为与电解质相匹配.
- 复合电极表现出高电化学活性和出色的稳定性.
- 发现了新的间期和A站点缺陷,有助于提高性能.
结论:
- 通过负热膨胀材料的反应性烧结引入热膨胀偏移是一种可行的策略.
- 这种方法为开发固体氧化物燃料电池的完全兼容和高活性电极提供了一种一般方法.
- 克服热力学不稳定性是推进固体氧化物燃料电池技术的关键.
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