一个用于下一代固体氧化物燃料电池的高性能阴极
Zongping Shao1, Sossina M Haile
1Materials Science, California Institute of Technology, Pasadena, California 91125, USA.
Nature
|September 10, 2004
概括
研究人员开发了一种新的正极材料,Ba{0.5}Sr{0.5}Co{0.8}Fe{0.2}O{3-delta) (BSCF),用于固体氧化物燃料电池 (SOFC). 这一进步使得在较低的温度下能够高效运行,解决了SOFC技术的一个关键挑战.
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:
- 固体氧化物燃料电池 (SOFC) 提供高效和环保的发电,同时具有燃料灵活性.
- 传统SOFC的高工作温度 (8001,000°C) 会导致高成本和材料限制.
- 开发中温 (500700°C) SOFC对于更广泛的采用至关重要,但需要改进的阴极材料.
研究的目的:
- 引入一种新的正极材料,Ba{0.5}Sr{0.5}Co{0.8}Fe{0.2}O{3-delta) (BSCF),用于降温SOFC操作.
- 为了评估BSCF在薄膜合化烯酸燃料电池中在中间温度下的性能.
- 评估BSCF对于单燃料电池配置的适用性.
主要方法:
- 合成了BSCF,并将其作为阴极材料纳入薄膜化烯燃料电池中.
- 用加湿作为燃料和空气作为600°C和500°C的阴极气体来测量电化学性能.
- 研究了通过BSCF材料的氧气扩散率,以了解性能.
主要成果:
- 基于BSCF的燃料电池在600°C时实现了高功率密度的1,010 mW cm-2和在500°C时达到402 mW cm-2.
- 该材料在单燃料电池操作中表现出色.
- 通过BSCF的高氧气扩散率被确定为其高功率输出的原因.
结论:
- BSCF是中温SOFC的有前途的阴极材料,克服了传统材料的局限性.
- 该材料的高性能和适合单操作,为实际的SOFC实施铺平了道路.
- 通过BSCF实现的降低工作温度可以显著降低SOFC成本并扩大其适用性.
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