动态重组Nix Cry O 在真实海水中稳定氧气演化反应的电催化剂
Abdul Malek1,2, Yanrong Xue1,2, Xu Lu1,2
1CCRC, Division of Physical Science and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 (Kingdom of, Saudi Arabia.
Angewandte Chemie (International ed. in English)
|August 14, 2023
概括
这项研究引入了一种新的NixCrγO电催化剂,该电催化剂在海水中实现了氧化演化反应 (OER) 的长期稳定性和增强活性. 催化剂在运行过程中自我重组,随着时间的推移提高其性能,并抵消实际海水中的杂质.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 在海水中实现氧化演化反应 (OER) 电催化剂的长期稳定性至关重要,但具有挑战性.
- 保持内在的催化活性,同时防止在恶劣的性条件下降解,仍然是关键障碍.
研究的目的:
- 开发一种强大的电催化剂,用于性介质和真实海水中的高效和稳定的OER.
- 研究电催化剂的自我重组机制及其对OER活动和稳定性的影响.
主要方法:
- 电化学测量 (超电位,电流密度,长期稳定性测试).
- 现场研究分析催化剂重组 (Cr浸和再分配).
- 在人工和真实的红海海水中进行测试,添加1M KOH.
主要成果:
- NixCrγO在1M KOH中表现出低超电位 (270mV在100mA/cm2,320mV在500mA/cm2) 在1M KOH中.
- 观察到异常稳定性 (>475小时在100mA/cm2,>280小时在500mA/cm2).
- 动态Cr再分配增加了电化学活性表面积和多孔性,增强了OER活动.
- 在真正的红海海水中具有显著的稳定性 (2000小时在10 mA/cm2,275小时在100 mA/cm2,100小时在500 mA/cm2).
结论:
- NixCrγO电催化剂表现出自我重组的能力,从而提高了开放式电源的活性和稳定性.
- 动态的孔径演变有效地抵消海水杂质,使在真实海水中稳定运行.
- 这项工作为直接海水分裂应用提供了一个有前途的非贵金属基催化剂.
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