在水氧化反应过程中胺 TiO2薄膜阳极的稳定性
Jacob E Kupferberg1, Igor Messias1, Vepa Rozyyev2,3
1Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States.
ACS applied materials & interfaces
|August 8, 2025
概括
与相配合的二氧化 (Mn:TiO2) 电极显示出改善的水氧化,但随着时间的推移而降解. 表面是氧化还原活性,虽然化提高了稳定性,但在高电位下仍然会发生损失,影响性能.
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
- 催化剂是一种催化剂.
背景情况:
- 添加的二氧化 (Mn:TiO2) 增强了水的氧化活性.
- 在应用电位下电极的降解限制了实际应用,特别是在高电位下.
研究的目的:
- 研究通过原子层沉积 (ALD) 制造的Mn:TiO2薄膜电极的降解机制.
- 为了将组合变化与电化学稳定性和水氧化活性相关联.
主要方法:
- 原子层沉积 (ALD) 用于精确的 Mn:TiO2 薄膜制造.
- 电化学测量以评估活性和稳定性.
- 在现场的感应合等离子体质谱 (ICP-MS) 来追踪损失.
主要成果:
- 只有距离表面1.5纳米以内的是有氧化还原活性的.
- 化促进了Mn向表面的扩散,并改变了氧化还原行为,增强了稳定性,但不能完全防止电流衰变.
- 薄膜中的损耗发生在电位>1.8V与RHE时,初始损耗<1ALD层.
- 长期实验表明,从上1纳米损失,部分导致水氧化活性下降.
结论:
- 电极降解与高电位的损失有关.
- 表面的度和氧化还原行为对于水的氧化活性和稳定性至关重要.
- 通过ALD制造的Mn:TiO2显示出有希望的结果,但需要进一步的稳定策略来持续氧化水.
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