Ti_(3)C_(2)/In_(4)SnS_(8)肖特基异质结用于高效光催化生成H_(2)O_(2)和Cr(Ⅵ)还原  

Efficient Photocatalytic H_(2)O_(2)Production and Cr(Ⅵ)Reduction over a Hierarchical Ti_(3)C_(2)/In_(4)SnS_(8)Schottky Junction

作　　者：周彤 刘雪 赵亮 乔明涛 雷琬莹 Tong Zhou;Xue Liu;Liang Zhao;Mingtao Qiao;Wanying Lei(College of Materials and Science,Xi’an University of Architecture and Technology,Xi’an 710055,China;Institute of Tobacco Research,Chinese Academy of Agricultural Sciences,Qingdao 266101,Shandong Province,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]中国农业科学院烟草研究所,山东青岛266101

出　　处：《物理化学学报》2024年第10期36-38,共3页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(51902243,52302112);陕西省教育厅重点科研计划项目(22JY039,22JY037);中央非营利科研机构基础研究经费(1610232023008);农业科技创新计划(ASTIP-TRIC07)资助。

摘　　要：人工光合成是一种先进的技术,主要利用太阳能作为唯一驱动能源,将水和氧气转化成双氧水(H_(2)O_(2))。然而,目前常用的光催化系统的性能受制于其光吸收能力有限,载流子分离效率低以及表面反应能力弱等问题。在本文研究中,通过采用原位水热法,成功地在少层Ti_(3)C_(2)纳米片表面生长厚度为5-10 nm的立方相In_(4)SnS_(8)纳米片(Eg=2.16 eV),形成了一种具有三明治结构的Ti_(3)C_(2)/In4SnS8纳米复合材料。深入的表征结果显示此2D/2D异质结构具有紧密的界面相互作用并且形成肖特基异质结,有助于载流子快速从In_(4)SnS_(8)转移至Ti_(3)C_(2)表面。其中,7 wt%Ti_(3)C_(2)/In_(4)SnS_(8)复合材料表现出最佳的可见光催化性能,H_(2)O_(2)生成速率为1.998µmol·L^(-1)·min·1,Cr(Ⅵ)的还原速率为19.8×10^(-3)min^(-1)。通过捕获实验、气氛实验和电子顺磁共振分析,证明了H_(2)O_(2)生成的途径包括两种:一种是两步单电子还原路径,另一种是一步两电子水氧化路径。本研究为设计高效、多功能的催化体系提供了一种新的思路。Artificial photosynthesis is an appealing approach for generating hydrogen peroxide(H_(2)O_(2))from H_(2)O and O_(2) with solar energy as the sole energy input.However,the current catalyst systems commonly face challenges such as the limited optical absorption,poor electron-hole pair separation efficiency,and restricted surface reactivity,which hinders the overall photoactivity.Here,we immobilize cubicphase ultrathin In_(4)SnS_(8) nanosheets(E_(g)=2.16 eV)with thickness of 5-10 nm on the surface of few-layer Ti_(3)C_(2) to develop a sandwich-like hierarchical structure of Ti_(3)C_(2)/In_(4)SnS_(8) nanohybrid via in situ hydrothermal strategy.The enlarged interfacial area and close contact between Ti_(3)C_(2) and In_(4)SnS_(8) benefit for carrier transportation among nanohybrids.Characterization through X-ray diffraction(XRD),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS)corroborates the successful construction of Ti_(3)C_(2)/In_(4)SnS_(8) nanostructures.Band structures investigation including valence band maximum and Mott-Schottky plots reveals the formation of Schottky junction in this 2D/2D heterostructure,that favors for ultrafast charge carrier separation and transportation from In_(4)SnS_(8) to Ti_(3)C_(2) and preventing the electrons backflow from Ti_(3)C_(2) to In_(4)SnS_(8).Photoluminescene analysis and photo/electrochemical measurements prove that the combination of Ti_(3)C_(2) and In_(4)SnS_(8) accelerates the transportation of photoexcited electronhole pairs and efficiently suppresses charge carrier recombination.Unsurprisingly,7 wt%Ti_(3)C_(2)/In_(4)SnS_(8) catalysts exhibit the highest visible-light-driven photoreactivity with H_(2)O_(2) production rates of 1.998μmol·L^(-1)·min^(-1) that is 2.2 times larger than that of single In_(4)SnS_(8).Additionally,Ti_(3)C_(2)/In_(4)SnS_(8) demonstrates a multifunctional capability in Cr(VI)reduction with the greatest reaction rates of 19.8×10^(-3) min^(-1) that is almost 4-fold larger than that of individual semiconductor.Mo

关 键 词：Ti_(3)C_(2) In_(4)SnS_(8) 光催化 生成H_(2)O_(2) Cr(Ⅵ)还原 

分 类 号：O643[理学—物理化学]