Hierarchal Nanorod-Derived Bilayer Strategy to Enhance the Photocurrent Density of Sb2Se3 Photocathodes for Photoelectrochemical Water Splitting
Hierarchal Nanorod-Derived Bilayer Strategy to Enhance the Photocurrent Density of Sb2Se3 Photocathodes for Photoelectrochemical Water Splitting
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DOI：
10.1021/acsenergylett.9b02486
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发表时间：
2020-01-01
影响因子：
22
通讯作者：
Moon, Jooho
中科院分区：
文献类型：
--
作者：
Park, Jaemin;Yang, Wooseok;Moon, Jooho
对于实际的光电化学(PEC)水分解制氢，合适的纳米结构策略具有足够的光吸收和有效的载流子传输是非常重要的。在这项研究中，通过独特的顺序使用两种不同的分子油墨，在底部致密的Sb2Se3层上制备了由垂直取向的纳米棒Sb2Se3组成的双层光电阴极纳米结构。这种层次化的纳米棒双层结构由于散射效应具有捕光能力，从而增强了光的吸收。双层Sb2Se3光电阴极由于具有良好的晶体取向和垂直排列的纳米棒的表面积增大的协同效应，也表现出更好的电荷传输能力。与可逆氢电极相比，双层Sb2Se3光电阴极在0V时的光电流密度接近30 mA cm(-2)。这一观察结果表明，所提出的溶液处理的基于Sb2Se3的分层双层结构是一种有效的PEC水分离串联器件的候选方案。
For practical H-2 production via photoelectrochemical (PEC) water splitting, a proper nanostructure strategy allowing sufficient light absorption and effective charge carrier transport is of immense importance. In this study, via the unique sequential use of two different molecular inks, a bilayer nanostructure for a photocathode composed of vertically oriented nanorods Sb2Se3 on top of a bottom compact Sb2Se3 layer is produced. The hierarchical nanorod bilayer structure possesses light-trapping ability owing to the scattering effect, resulting in the enhancement of light absorption. The bilayer Sb2Se3 photocathode also exhibits better charge-transport capability owing to the synergetic effects of the favorable crystallographic orientation and the enlarged surface area of the vertically aligned nanorods. The bilayer Sb2Se3 photocathode achieves a photocurrent density of nearly 30 mA cm(-2) at 0 V vs the reversible hydrogen electrode. This observation implies that the proposed solution-processed Sb2Se3-based hierarchical bilayer structure is a promising candidate for an efficient PEC water splitting tandem device.