From millimetres to metres: the critical role of current density distributions in photo-electrochemical reactor design
From millimetres to metres: the critical role of current density distributions in photo-electrochemical reactor design
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DOI：
10.1039/c6ee03036j
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发表时间：
2017-01-01
影响因子：
32.5
通讯作者：
Kelsall, G. H.
中科院分区：
文献类型：
--
作者：
Hankin, A.;Bedoya-Lora, F. E.;Kelsall, G. H.
采用喷雾热解法制备了0.1 × 0.1 m(2)掺锡赤铁矿光阳极，并将其置于光电化学反应器中进行光催化分解。迄今为止，光电化学研究主要集中于光电极的制造、性能和行为，而本文报道的实验和建模结果都解决了反应器放大的问题，即最小化电位、电流密度和由此产生的析氢率的空间分布的不均匀性。这些信息对于优化光电化学反应器的设计和光子能量到氢的转换效率以推进其工业部署至关重要。本文提出的二维和三维反应器模型与改进的赤铁矿薄膜在黑暗和光照下的析氧微动力学模型相结合。该模型首次应用于放大后的光电反应器，并与实验数据进行了对比验证。
0.1 x 0.1 m(2) tin-doped hematite photo-anodes were fabricated on titanium substrates by spray pyrolysis and deployed in a photo-electrochemical reactor for photo-assisted splitting of water into hydrogen and oxygen. Hitherto, photo-electrochemical research focussed largely on the fabrication, properties and behaviour of photo-electrodes, whereas both experimental and modelling results reported here address reactor scale-up issues of minimising inhomogeneities in spatial distributions of potentials, current densities and the resultant hydrogen evolution rates. Such information is essential for optimising the design and photon energy-to-hydrogen conversion efficiencies of photo-electrochemical reactors to progress their industrial deployment. The 2D and 3D reactor models presented here are coupled with a modified micro-kinetic model of oxygen evolution on hematite thin films both in the dark and when illuminated. For the first time, such a model is applied to a scaled-up photo-electrochemical reactor and validated against experimental data.