化PrBa的制备和性能0.8Sr0.2Co2O5+δ 矿阴极材料
Mengxin Li1, Songbo Li1, Shengli An2
1School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Molecules (Basel, Switzerland)
|March 13, 2025
概括
兴奋剂增强PrBa$_{0.8}$Sr$_{0.2}$Co$_{2}$O$_{5+δ-x}$F$_{x}$用于固体氧化物燃料电池 (SOFC) 的阴极材料. 这提高了热膨胀和电化学性能,减少了特定区域的电阻.
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 储能 储能 储能 储能 储能
背景情况:
- 固体氧化物燃料电池 (SOFC) 需要先进的阴极材料,以实现高效的能量转换.
- PrBa$_{0.8}$Sr$_{0.2}$Co$_{2}$O$_{5+δ}$ (PBSC) 是一个有前途的阴极材料,但其性能可能受到热膨胀和电化学性能的限制.
- 兴奋剂被探索为一种策略,以提高基于矿的阴极材料的性能.
研究的目的:
- 为了合成和表征F-doped PrBa$_{0.8}$Sr$_{0.2}$Co$_{2}$O$_{5+δ-x}$F$_{x}$ (PBSCF$_{x}$) 阴极材料.
- 调查F兴奋剂对晶体结构的影响,热膨胀系数 (TEC) 和PBSC的电化学性能.
- 评估这些材料对于高性能SOFC应用的适用性.
主要方法:
- 使用Sol-gel合成制备PBSCF$_{x}$粉末,具有不同F兴奋剂度 (x = 0到0.1).
- 使用X射线衍射 (XRD) 分析合成材料的晶体结构和相纯度.
- 测量了热膨胀系数 (TEC),以评估热稳定性.
- 通过在高温下测量面积特异性电阻 (ASR),导电性和功率密度来评估电化学性能.
主要成果:
- 所有F-doped样本都保持了四角矿结构,没有二次阶段.
- F剂有效地降低了正极材料的TEC,从PBSC的25.3699 × 10$^{-6}$ K$^{-1}$降低到PBSCF$_{0.1}$的23.5295 × 10$^{-6}$ K$^{-1}$,从PBSC的25.3699 × 10$^{-6}$降低到PBSCF$_{0.1}$的23.5295 × 10$^{-6}$.
- PBSCF$_{0.05}$样本表现出极好的电化学性能,ASR为0.0207 Ω·cm$^{2}$,导电率为1637.27 S·cm$^{-1}$,最大功率密度为856.08 mW·cm$^{-2}$,温度为800°C.
- 该材料表现出良好的稳定性,在800°C下100小时运行后,性能仅略有下降.
结论:
- F兴奋剂是一种可行的策略,可以显著提高SOFCs的PrBa$_{0.8}$Sr$_{0.2}$Co$_{2}$O$_{5+δ}$阴极材料的电化学性能和热稳定性.
- 优化的F兴奋剂度提高了导电性和功率密度,同时减少了热膨胀.
- 这些发现表明,F-doped PBSC材料是下一代 SOFC 阴极的有希望的候选者.
更多相关视频
13:09Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
14.7K
08:51Preparation of Polypentafluorophenyl acrylate Functionalized SiO2 Beads for Protein Purification
Published on: November 19, 2018
9.5K
相关概念视频
Electron Affinity
35.1K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
35.1K
Halogens
18.2K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
18.2K
Noble Gases
17.2K
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
17.2K
