Water Oxidation with Cobalt-Loaded Linear Conjugated Polymer Photocatalysts.
Water Oxidation with Cobalt-Loaded Linear Conjugated Polymer Photocatalysts.
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负载钴的线性共轭聚合物光催化剂氧化水
DOI：
10.1002/anie.202008000
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发表时间：
2020-10-12
期刊：
影响因子：
--
通讯作者：
Wang X
中科院分区：
文献类型：
--
作者：
Sprick RS;Chen Z;Cowan AJ;Bai Y;Aitchison CM;Fang Y;Zwijnenburg MA;Cooper AI;Wang X
报道了第一批线性共轭有机聚合物光催化剂的例子，它们在负载钴后，在电子清除剂的存在下从水中产生氧气。比相关有机材料更高的析氧速率可以通过结合水氧化的热力学驱动力、聚合物的光吸收以及相对亲水的聚合物颗粒的水分散性来合理化。我们还使用瞬时吸收光谱来研究性能最好的系统，我们发现在电子清除剂的存在下激子发生快速氧化猝灭(皮秒)，最大限度地减少复合。报道了10种线性共轭有机聚合物光催化剂在电子清除剂存在下对水氧化的催化作用。这一结果可以由热力学驱动力、光吸收和相对亲水的聚合物颗粒的分散性等综合因素来解释。用暂态吸收光谱研究了载流子的动力学行为。
The first examples of linear conjugated organic polymer photocatalysts that produce oxygen from water after loading with cobalt and in the presence of an electron scavenger are reported. The oxygen evolution rates, which are higher than for related organic materials, can be rationalized by a combination of the thermodynamic driving force for water oxidation, the light absorption of the polymer, and the aqueous dispersibility of the relatively hydrophilic polymer particles. We also used transient absorption spectroscopy to study the best performing system and we found that fast oxidative quenching of the exciton occurs (picoseconds) in the presence of an electron scavenger, minimizing recombination. Ten linear conjugated organic polymer photocatalysts are presented for water oxidation in the presence of an electron scavenger. The results can be explained by a combination of factors, such as thermodynamic driving force, light absorption, and dispersibility of the relatively hydrophilic polymer particles. Transient absorption spectroscopy was used to study the charge‐carrier dynamics.
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