Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University , Shanghai 200444, P. R. China.
Institute of Physics and Macro- and Nanotechnologies MacroNano (IMN & ZIK), Ilmenau University of Technology , 98693 Ilmenau, Germany.
ACS Appl Mater Interfaces. 2017 Jul 19;9(28):23647-23653. doi: 10.1021/acsami.7b03801. Epub 2017 Jul 3.
The nanowall has been regarded as a promising architecture for highly efficient photoelectrochemical (PEC) water splitting due to various advantages, such as open geometry, highly reactive facets, independent contact with current collector, and so forth. Here, a vertically aligned BiMoO nanosheet array, which is also called a nanowall, is first achieved directly on the ITO glass by a facile solvothermal approach. The structural features not only offer multiple superiorities for PEC processes, but also provide the bridge for in-depth insights of intrinsic features of BiMoO photoanodes. A quantitative analysis of the electrochemical process declares that the utilization of photogenerated charges in the BiMoO nanowall has been optimized, but the main obstacle comes from the severe bulk recombination and low efficiencies of charge separation. This evaluation both enriches the visual assessment methods and directs clear guidance for future improvement, which could serve as a beacon for well-directed and economic photoelectrode amelioration, to shorten the road toward ideal photoelectrodes.
由于具有开放结构、高反应性晶面、与集流器独立接触等诸多优点，纳米墙被认为是一种很有前途的高效光电化学（PEC）水分解结构。在此，我们首次通过简便的溶剂热法在 ITO 玻璃上直接制备了垂直排列的 BiMoO 纳米片阵列，也称为纳米墙。这种结构不仅为 PEC 过程提供了多种优势，也为深入了解 BiMoO 光阳极的固有特性提供了桥梁。对电化学过程的定量分析表明，BiMoO 纳米墙中光生载流子的利用得到了优化，但主要障碍来自于严重的体复合和电荷分离效率低。这种评估不仅丰富了可视化评估方法，还为未来的改进提供了明确的指导，为定向、经济的光电电极改良指明了方向，缩短了理想光电电极的研发道路。
