金箔上单层MoS_2的控制生长及电催化析氢应用  

Controllable Growth of MoS_2 on Au Foils and Its Application in Hydrogen Evolution

作　　者：史建平[1,2] 马冬林[2] 张艳锋[1,2] 刘忠范[2] 

机构地区：[1]北京大学工学院材料科学与工程系,北京100871 [2]北京大学化学与分子工程学院纳米化学研究中心北京市低维碳材料科学与工程技术研究中心,北京100871

出　　处：《化学学报》2015年第9期877-885,共9页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.51222201;51290272;51472008;51072004;51121091;51432002);国家重点基础研究发展计划(Nos.2011CB921903;2012CB921404;2012CB933404;2013CB932603;2011CB933003)资助~~

摘　　要：金属衬底上单层Mo S2的可控批量制备是探索其微观形貌、新奇物理化学特性以及潜在应用的重要前提.最近,我们利用低压化学气相沉积的方法,在多晶金箔上实现了高质量、大面积/大批量、畴区尺寸可调(从几百纳米到几十微米)单层Mo S2的可控制备;利用低能电子显微/衍射实现了直接生长的单层Mo S2畴区取向和畴区边界的原位识别;利用金箔上合成的纳米尺寸Mo S2作为电催化析氢反应的催化剂,实现了高效的析氢效果(塔菲尔斜率约61 m V/dec,交换电流密度约38.1μA/cm2).本文将以这些研究成果为主线,系统地阐述金箔上单层Mo S2的可控制备和转移、畴区的原位识别以及在电催化析氢反应中的应用,并对该领域的未来发展趋势和所面临的挑战进行简要的展望.Controllable synthesis of monolayer Mo S2 on metal substrates is the basic premise for exploring the intrinsic electronic structure, some novel physical properties, and engineering its application in hydrogen evolution reaction（HER）. In recent years, we have been working on low-pressure chemical vapor deposition（LPCVD） growth of monolayer Mo S2 on Au foils, with the domain size can be tuned from several hundred nanometers to dozens of microns. By introducing H2 as carrier gas, we have synthesized large domain monolayer Mo S2 triangular flakes on Au foils, with the edge length approaching to ca. 81 μm. By using low-energy electron microscopy/diffraction（LEEM/LEED） method, the crystal orientations and domain boundaries of monolayer Mo S2 flakes directly on Au foils are further on-site identified. Of particular interest, the nanosized Mo S2 flakes on Au foils are proven to be excellent electrocatalysts for HER, featured by a rather low Tafel slope（ca. 61 m V/dec） and a relative high exchange current density（ca. 38.1 μA/cm2）. In this review, we summarized controllable growth and on-site domain boundary imaging of monolayer Mo S2 on Au foils and its application in HER together with a brief discussion on the future directions, challenges and opportunities in this research area.

关 键 词：二硫化钼 金箔 化学气相沉积 可控制备 低能电子衍射 电催化析氢反应 

分 类 号：TQ136.12[化学工程—无机化工]