Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, India.
Materials Science Centre, Indian Institute of Technology , Kharagpur 721302, India.
ACS Appl Mater Interfaces. 2017 Dec 6;9(48):41818-41826. doi: 10.1021/acsami.7b10466. Epub 2017 Nov 27.
Herein, for the first time, we applied the metal-metal-bond-energy factor to the evolution of a porous Se-Te alloy. The porous Se-Te material has been prepared from the constituents' elemental states, through only a heating-cooling process in silicone oil without the use of any reagent, surfactant, or capping agent. Surprisingly, the reaction occurred at a much lower temperature (240 °C) than the mp (450 °C) of Te. The reaction's nucleation and growth by means of varied bond energy have been clarified for the first time. A difference in the bond energies of a hetero metal-metal bond (Se-Te) and a homo metal-metal bond (Se-Se) directs nucleation and growth toward the fabrication of a porous structure, even from the constituents' elemental states, in which low-angle-grain-boundary (LAGB) and high-angle-grain-boundary (HAGB) movements play governing roles. Proper band-gap alignment of Se and Te makes the alloy composite applicable to water-splitting reactions under Xe-arc-lamp illumination. PEC efficiency of Se-Te was found to be higher than those reported for Se and other composite materials.
在此，我们首次将金属-金属键能因子应用于多孔硒碲合金的演变。通过仅在硅油中进行加热-冷却过程，从元素状态制备多孔 Se-Te 材料，而无需使用任何试剂、表面活性剂或封端剂。令人惊讶的是，反应发生的温度（240°C）远低于 Te 的熔点（450°C）。首次阐明了通过不同键能进行反应成核和生长的过程。杂金属-金属键（Se-Te）和同金属-金属键（Se-Se）的键能差异指导成核和生长，即使从元素状态的组成部分，也能制备出多孔结构，其中小角度晶界（LAGB）和大角度晶界（HAGB）的运动起着主要作用。Se 和 Te 的适当能带隙排列使合金复合材料适用于 Xe 弧光灯照射下的水分解反应。发现 Se-Te 的 PEC 效率高于报道的 Se 和其他复合材料的效率。
