一种分子衍生 (II) 光电化学氧化水的催化剂
Lei Wu1, Michael Eberhart1, Animesh Nayak1
1Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States.
Journal of the American Chemical Society
|October 30, 2018
概括
研究人员开发了一种基衍生催化剂,用于光电合成细胞中稳定高效的光驱氧化水. 这一进步解决了可持续能源应用的长期稳定性挑战.
科学领域:
- 电化学
- 材料科学
- 光催化
背景情况:
- 染料敏感光电合成细胞 (DSPEC) 使用电极上的分子组件进行光驱动的水氧化.
- 对于可持续的DSPEC来说,一个关键的挑战是这些表面结合组件的长期稳定性.
- 虽然染色体稳定已取得进展,但催化剂稳定仍然是一个重大障碍.
研究的目的:
- 在DSPEC中制定强大的催化剂稳定策略.
- 为了研究基催化剂的电化学稳定性和水氧化活性.
- 评估稳定催化剂在中孔金属氧化物电极上的性能.
主要方法:
- 一种由西兰衍生的催化剂,Ru (bda) (L) 2 (催化剂1) 的合成.
- 将催化剂固定在带有TiO2稳定色素的中孔SnO2/TiO2核心/外电极上.
- 在各种pH条件下对催化剂稳定性的电化学评估.
- 对光电化学水氧化效率和长期性能进行评估.
主要成果:
- 基衍生催化剂 (催化剂1) 在延伸的pH范围内的金属氧化物表面上表现出增强的稳定性.
- 在各种条件下,催化剂保持了电化学氧化的反应性.
- 在SnO2/TiO2电极上的光电化学氧化产生了最大效率为1.25mA/cm2的O2.
- 长期的催化活性损失归因于通过轴联体解离的催化剂脱离.
结论:
- 在电极表面稳定水氧化催化剂时,西兰衍生是一种可行的策略.
- 开发的光电极系统显示了光驱水氧化的高效率.
- 需要进一步的研究来解决催化剂脱离机制,以提高长期运行稳定性.
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