College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215006, P. R. China.
ACS Appl Mater Interfaces. 2014 Oct 8;6(19):17200-7. doi: 10.1021/am505015j. Epub 2014 Sep 24.
We report the fabrication of 2D ZnIn2S4 nanosheet/1D TiO2 nanorod heterojunction arrays by a facile hydrothermal process and their use as photoelectrodes in a photoelectrochemical (PEC) cell for high-performance solar water splitting. The morphology, microstructure, and phase of pristine TiO2 and 2D ZnIn2S4 nanosheet/1D TiO2 nanorod heterojunction arrays were characterized in detail. PEC measurements showed that 2D/1D heterojunction arrays offered enhanced photocurrent density (3 times higher than that of pristine TiO2), negatively shifted onset potential from 0.05 to -0.53 V, and high light on/off cycle stability. Electrochemical impedance investigation attested to a significant improvement of the interface electron transfer kinetics in this heterojunction, thus facilitating electron-hole separation, transfer, and collection, which resulted in enhanced PEC properties.
我们通过简便的水热法制备了二维 ZnIn2S4 纳米片/一维 TiO2 纳米棒异质结阵列,并将其用作光电化学(PEC)池中的光电极,以实现高效太阳能水分解。详细表征了原始 TiO2 和二维 ZnIn2S4 纳米片/一维 TiO2 纳米棒异质结阵列的形态、微观结构和相。PEC 测量表明,二维/一维异质结阵列提供了增强的光电流密度(比原始 TiO2 高 3 倍),起始电位从 0.05 负移至-0.53 V,并且具有高光开/关循环稳定性。电化学阻抗研究证明,这种异质结中界面电子转移动力学有了显著改善,从而促进了电子-空穴的分离、转移和收集,从而提高了 PEC 性能。