摘要
能源及污染是新时代所面临的重要难题,光催化技术可通过电解水产氢以及降解有机物污染物,在一定程度上解决此问题.而制备光催化活性较好、光生载流子分离效率高的光催化剂是这项技术的关键.本文采用液相剥离法结合电泳沉积法制备得到具有不同堆垛结构的二硫化铼-石墨烯(ReS_2-Gra, ReS_2在上)与石墨烯-二硫化铼(Gra-ReS_2,石墨烯在上)范德瓦耳斯异质结薄膜,并对其进行了光谱学表征.将上述异质结作为光电极材料,应用在光电化学反应中,发现:1)不同的堆垛结构,将影响异质结材料的光电化学特性,即在相同条件下,与ReS_2-Gra光电极相比, Gra-ReS_2光电极的光电流增大了54%;2)异质结的构建,使得光电极材料的光电化学特性得到显著增强,得到了更大且响应更迅速的光电流,即Gra-ReS_2光电极(2.47μA)的光电流响应是纯ReS_2光电极(1.16μA)的2倍.本工作为范德瓦耳斯异质结的制备提出新思路的同时,也为太阳能转换器件的研究打下了理论基础.
Energy and pollution are crucial problems.Photocatalysis technology is a way to solve the problem by electrolysis of aquatic hydrogen and degradation of organic pollutants.Preparing photocatalysts with fantastic photocatalytic activity and high photocarrier separation efficiency is a key technique.In recent years,twodimensional(2D)nanomaterials have attracted much attention because of their unique structures and excellent properties,which are different from the traditional materials’.The 2D nanomaterials demonstrate in-plane covalent bonds and out-of-plane van der Waals interactions.Therefore,two 2D materials can form van der Waals heterojunctions by van der Waals forces,which are also known as nanocomposites.However,there is an interesting problem in the study of van der Waals heterojunctions in the field of photochemistry,which has not been paid attention to no studied.Specifically,that problem is whether the photochemical properties of the van der Waals heterojunctions are affected by the different stacking structures after the relationship between the upper and lower positions has been adjusted.In this paper,the van der Waals heterojunction films with different stacking structures ReS2-Gra(ReS2 on the top)and Gra-ReS2(graphene on the top)are prepared by liquid phase exfoliation combined with electrophoretic deposition method.The heterojunctions are utilized as photoelectrodes in photochemical reactions,and the findings are as follows.i)Different stacking structures will affect the photoelectric chemical characteristics of heterojunctions:comparing with the ReS2-Gra photoelectrode,the photocurrent of the Gra-ReS2 photoelectrode increased by 54%under the same conditions.We think that the main reason is due to the fact that graphene has a zero-band gap structure and holds a wider spectral absorption range.ii)The construction of the heterojunction significantly enhances the photochemical properties of the photoelectrode materials,resulting in a larger and rapidly photocurrent response.The photocurrent response
作者
徐翔
张莹
闫庆
刘晶晶
王骏
徐新龙
华灯鑫
Xu Xiang;Zhang Ying;Yan Qing;Liu Jing-Jing;Wang Jun;Xu Xin-Long;Hua Deng-Xin(School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048,China;Shannxi Key Laboratory of Mechanical Manufacturing Equipment,Xi’an University of Technology,Xi’an 710048,China;Institute of Photonics&Photon-Technology,Northwest University,Xi’an 710069,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第9期360-366,共7页
Acta Physica Sinica
基金
中国博士后科学基金(批准号:2020M673611XB)
陕西省教育厅科研基金(批准号:20JK0781,17JS094)
陕西省自然科学基金(批准号:2018JQ4046)资助的课题。
