氧化基光电解极的降解
Julian Hörndl1, Jakub Zalesak1, Franky E Bedoya-Lora2
1Department of Chemistry and Physics of Materials, Paris Lodron University Salzburg Jakob-Haringer-Str. 2A 5020 Salzburg Austria simone.pokrant@plus.ac.at.
概括
通过光电化学水分的绿色生产需要稳定的光电极. 这项研究表明,表面氧化和催化剂溶解会降解LaTiO2N光电极,提出了一个新的稳定性度量.
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
- 可再生能源是可再生能源的来源.
背景情况:
- 光电化学 (PEC) 水分离对于绿色生产和能源脱碳至关重要.
- PEC技术的商业化取决于提高光电极材料的稳定性.
- 了解降解机制对于开发强大的氧尼化物光电解极至关重要.
研究的目的:
- 研究用于PEC水分解的基于LaTiO2N粒子的光电极的降解机制.
- 确定适合的优点数字来量化氧尼化物光电极的稳定性.
- 提出一种基于时空度测量衰变过程的替代性价值数字.
主要方法:
- 在1.23V和RHE的基本电解质中测量时的时光度测量.
- 用两个指数项的和来进行当前衰变的半经验相关性分析.
- 先进的材料表征包括STEM-EDX/EELS,HREM,ICP-MS和XPS在降解之前和之后.
主要成果:
- 在 chronoamperometries 中确定了两个不同的电流衰变过程.
- 第二个指数式衰变项的时间常数被提出为氧化光电极稳定性的新功绩数字.
- 实验证据表明,退化是由LaTiO2N光电极的表面氧化和催化剂溶解引起的.
结论:
- 根据第二个指数衰变时间常数,提出的优点数字有效量化了oxynitride光电极的稳定性.
- 表面氧化和催化剂溶解是导致LaTiO2N光电极性能下降的主要原因.
- 这项研究为设计更稳定的光电极材料提供了关键的见解,以有效地生产绿色气.
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