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在低超电位的电催化进化过程中,由的宏环氧化和四胺复合体作用
Xile Hu1, Bruce S Brunschwig, Jonas C Peters
1Arnold and Mabel Beckman Laboratories of Chemical Synthesis and the Beckman Institute, Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|July 3, 2007
概括
哥巴尔特复合物与二氧化和四烯-N4连接物有效地通过电化学催化进化. 较低的CO2氧化还原潜力与较高的H2生产活性和稳定性相关.
科学领域:
- 无机化学 无机化学 有机化学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 科巴尔特复合物正在研究它们在电催化进化中的潜力.
- 了解氧化还原潜力和催化活性之间的关系对于设计高效的催化剂至关重要.
研究的目的:
- 为了合成和表征复合物与diglyoxime和四烯-N4连接体.
- 为了评估这些复合物的电催化活性,以评估在乙酸中的演化.
- 研究连接体结构和氧化还原特性对催化性能和稳定性的影响.
主要方法:
- 合成和表征-二甲氧化和-四-N4复合物.
- 使用循环电压测量和散装电解进行电催化演变测量.
- 电化学分析包括氧化还原潜力的确定.
- 数字模拟以阐明催化机制.
主要成果:
- 复合物与二氧化和四烯-N4配体呈现电催化 H2 演变在 -0.55 V 和 -0.20 V 与 SCE 之间.
- 具有更积极的Co2氧化还原潜力的复合体显示出较低的H2生产活性.
- 对于Co(dmgBF2) 2 ((CH3CN) 2 ,Co(dpgBF2) 2 ((CH3CN) 2 ,[Co(TimMe) Br2]Br和[Co(TimMe) ((CH3CN) 2) ((BPh4) 3的催化 H2 演变得到证实,它们具有较高的营业额和极高的产量.
- Co ((dmgBF2) 2 ((CH3CN) 2) 显示出最小的超电位 (40 mV),并且还可以氧化H2.
- 通过循环电压测量观察到化介质的证据.
结论:
- 复合物,特别是Co{dmgBF2) 2{CH3CN) 2是H2演变的有效电催化剂.
- 体设计和氧化还原特性显著影响催化效率和稳定性.
- 催化机制很可能涉及Co ((III) 化物中间体.
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