Chava Rama Krishna, Son Namgyu, Kim Yang Soo, Kang Misook
Department of Chemistry, College of Natural Science, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Korea.
Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon 34133, Korea.
Nanomaterials (Basel). 2020 Mar 27;10(4):619. doi: 10.3390/nano10040619.
One dimensional (1D) metal sulfide nanostructures are one of the most promising materials for photocatalytic water splitting reactions to produce hydrogen (H). However, tuning the nanostructural, optical, electrical and chemical properties of metal sulfides is a challenging task for the fabrication of highly efficient photocatalysts. Herein, 1D CdS nanorods (NRs) were synthesized by a facile and low-cost solvothermal method, in which reaction time played a significant role for increasing the length of CdS NRs from 100 nm to several micrometers. It is confirmed that as the length of CdS NR increases, the visible photocatalytic H evolution activity also increases and the CdS NR sample obtained at 18 hr. reaction time exhibited the highest H evolution activity of 206.07 μmol.g.h. The higher H evolution activity is explained by the improved optical absorption properties, enhanced electronic bandstructure and decreased electron-hole recombination rate.
一维（1D）金属硫化物纳米结构是用于光催化水分解反应制氢（H）的最具前景的材料之一。然而，对于制备高效光催化剂而言，调节金属硫化物的纳米结构、光学、电学和化学性质是一项具有挑战性的任务。在此，通过一种简便且低成本的溶剂热法合成了一维CdS纳米棒（NRs），其中反应时间对将CdS NRs的长度从100 nm增加到几微米起着重要作用。证实随着CdS NR长度的增加，可见光催化析氢活性也增加，并且在18小时反应时间获得的CdS NR样品表现出最高的析氢活性，为206.07 μmol·g·h。更高的析氢活性可通过改善的光吸收性能、增强的电子能带结构和降低的电子 - 空穴复合率来解释。
