同质水氧化催化剂的催化步骤的电子结构和能量之间的相关性
Daan den Boer1, Dennis G H Hetterscheid1
1Leiden Institute of Chemistry, Leiden University, 2300RA, Leiden, The Netherlands.
Journal of the American Chemical Society
|October 10, 2023
概括
用电子捐赠或提取组修改催化剂会影响水的氧化步骤. 电子吸收组转移氧化潜力,为电催化剂提供了新的设计规则.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 水氧化电催化对于能量转换至关重要,但受到不利的缩放关系的限制.
- 同质催化剂通过连接体设计提供可调节的电子结构,与异质催化剂不同.
- 在水氧化催化中对联体效应的系统研究仍然很少.
研究的目的:
- 研究电子捐赠组 (EDG) 和电子吸收组 (EWG) 对电化学水氧化的影响.
- 探讨在cis-[Ru(bpy) 2(H2O]2+上的替代物如何影响电子转移 (ET),质子转移 (PT) 和质子合电子转移 (PCET) 等基本步骤.
主要方法:
- 用甲基,甲氧,和三甲基替代剂合成的cis-[Ru(bpy) 2(H2O) 2+衍生物.
- 在电化学水氧化过程中测试ET,PT和PCET步骤.
- 对氧化状态和催化途径的替代物效应分析.
主要成果:
- 发现PCET阶段对EDG和EWG不敏感,而脱ET和PT阶段受到显著影响.
- 替代剂的影响在较高的氧化状态下减少 (RuV/VI) 由于π回键的减少.
- 电子吸收组有效地将所有氧化事件转移到一个更窄的潜在窗口中.
结论:
- 在cis-[Ru(bpy) 2(H2O) ]2+上的电子替代物会影响水氧化的潜在能量.
- 与其他氧气进化催化剂相比,这些复合物表现出不同的设计规则和缩放关系.
- 定制连接体电子提供了优化水氧化电催化剂的途径.
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