Photocatalyst Z-scheme system composed of a linear conjugated polymer and BiVO4for overall water splitting under visible light
Photocatalyst Z-scheme system composed of a linear conjugated polymer and BiVO4for overall water splitting under visible light
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DOI：
10.1039/d0ta04754f
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发表时间：
2020-08-28
影响因子：
11.9
通讯作者：
Cooper, Andrew, I
中科院分区：
文献类型：
--
作者：
Bai, Yang;Nakagawa, Keita;Cooper, Andrew, I
线性共轭聚合物具有作为光催化剂从水中制氢的潜力，但到目前为止，大多数研究涉及不可扩展的牺牲试剂。包括多于一个半导体的Z方案是潜在的解决方案，但是设计这些系统是具有挑战性的，因为多个组件必须协同地一起工作。在这里，我们表明，用于质子还原的共轭聚合物光催化剂可以在Z-方案中与无机水氧化光催化剂耦合，以促进整体水分解而无需任何牺牲试剂。首先，有机催化剂，无机催化剂和氧化还原介体的一个有前途的组合被确定通过使用组件库的高通量筛选。然后构建了一个由P10（二苯并[B，d]噻吩砜均聚物）-Fe 2 +/Fe 3 +-BiVO（4）组成的Z型体系，在可见光照射下进行了全水裂解。瞬态吸收光谱被用来分配时间尺度的光催化过程中的各个步骤。虽然第一个例子的整体太阳能转化为氢的效率很低，但它为未来其他混合有机-无机Z方案架构提供了概念证明。
Linear conjugated polymers have potential as photocatalysts for hydrogen production from water but so far, most studies have involved non-scalable sacrificial reagents. Z-schemes comprising more than one semiconductor are a potential solution, but it is challenging to design these systems because multiple components must work together synergistically. Here, we show that a conjugated polymer photocatalyst for proton reduction can be coupled in a Z-scheme with an inorganic water oxidation photocatalyst to promote overall water splitting without any sacrificial reagents. First, a promising combination of an organic catalyst, an inorganic catalyst, and a redox mediator was identified by using high-throughput screening of a library of components. A Z-scheme system composed of P10 (homopolymer of dibenzo[b,d]thiophene sulfone)-Fe2+/Fe3+-BiVO(4)was then constructed for overall water splitting under visible light irradiation. Transient absorption spectroscopy was used to assign timescales to the various steps in the photocatalytic process. While the overall solar-to-hydrogen efficiency of this first example is low, it provides proof of concept for other hybrid organic-inorganic Z-scheme architectures in the future.