Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes
Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes
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DOI：
10.1039/c3sc50496d
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发表时间：
2013-01-01
期刊：
影响因子：
8.4
通讯作者：
Durrant, James R.
中科院分区：
文献类型：
--
作者：
Barroso, Monica;Pendlebury, Stephanie R.;Durrant, James R.
赤铁矿目前被认为是通过水的光电解转换和储存太阳能的最有前途的材料之一。虽然已经有了广泛的研究和发展的赤铁矿结构与增强的光电化学（PEC）活动的进展，相对有限的信息一直是可用的，直到最近有关的动力学的光生载流子在赤铁矿和它们对水的光电解效率的影响。在这个角度来看，我们提出了一个概述，我们最近的研究动态的光致电荷载流子过程中的赤铁矿，主要来自瞬态吸收光谱的纳米结构的光阳极。PEC活动和瞬态测量之间的关系进行了讨论，合理化的意见，特别是外部电位偏置的影响，在赤铁矿光阳极的相对速率的电荷载流子捕获，重组和界面转移水氧化的唯象模型。
Hematite is currently considered one of the most promising materials for the conversion and storage of solar energy via the photoelectrolysis of water. Whilst there has been extensive research and much progress in the development of hematite structures with enhanced photoelectrochemical (PEC) activity, relatively limited information has been available until recently concerning the dynamics of photogenerated charge carriers in hematite and their impact upon the efficiency of water photoelectrolysis. In this perspective we present an overview of our recent studies of the dynamics of photoinduced charge carrier processes in hematite, derived primarily from transient absorption spectroscopy of nanostructured photoanodes. The relationship between PEC activity and transient measurements are discussed in terms of a phenomenological model which rationalizes the observations and in particular the impact of external potential bias on the relative rates of charge carrier trapping, recombination and interfacial transfer in hematite photoanodes for water oxidation.