标题
作者
作者:Zhuang, MH (Zhuang, Minghao)[1 ]; Gan, LY (Gan, Li-Yong)[2 ]; Zou, MC (Zou, Mingchu)[3 ]; Dou, YB (Dou, Yubing)[1 ]; Ou, XW (Ou, Xuewu)[1 ]; Liu, ZJ (Liu, Zhenjing)[1 ]; Ding, Y (Ding, Yao)[1 ]; Abidi, IH (Abidi, Irfan Haider)[1 ]; Tyagi, A (Tyagi, Abhishek)[1 ]; Jalali, M (Jalali, Mahsa)[1 ]
期刊信息
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文献类型:Article
摘要
The edge site of two-dimensional (2D) transition metal dichalcoge-nides (TMDs) is active towards the hydrogen evolution reaction (HER). Herein, a feasible synthesis of sub-100 nm molybdenum/tungsten diselenide [Mo(1-x)WxSe2] crystals is described. The abundant edge exposure and heteroatom-doping synergistically boost the catalysis of HER by this material. In this work, sub-100 nm Mo(1-x)WxSe2 single crystals were grown on a nitrogen-doped multiwall carbon nanotube before being applied as HER electrocatalysts. At x = 0.13 +/- 0.02, the Mo(1-x)WxSe2 shows optimal HER catalytic performance with low overpotentials (70 and 129 mV) required to achieve current densities of -1 and -10 mA cm(-2), respectively, along with a Tafel slope of 53.6 mV dec(-1) and an exchange current density of 49.5 mA cm(-2). Density functional theory (DFT) calculations indicate that the Gibbs free energy of the HER process at the edge site of the crystals reaches a minimum value of 0.06 eV, which is lower than when the reaction is catalysed on Pt active sites. This study provides a general approach to increasing the edge proportion of the catalyst material and activating the terrace of the 2D materials for catalysis, which may be of benefit to the design and fabrication of other TMDs-based compounds.
关键词
KeyWords Plus:TRANSITION-METAL DICHALCOGENIDES; ACTIVE EDGE SITES; MOS2 NANOSHEETS; GRAPHENE; CARBON; WATER; ELECTROCATALYST; PHOSPHIDE; GROWTH
作者信息
通讯作者地址:Luo, ZT (通讯作者)
 | Hong Kong Univ Sci & Technol, Dept Chem & Biol Engn, Kowloon 999077, Hong Kong, Peoples R China. |
| South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China. |
地址:
电子邮件地址:ganly@scut.edu.cn; keztluo@ust.hk
出版商
类别分类
研究方向:Chemistry; Energy & Fuels; Materials Science
Web of Science 类别:Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary