title: Composition and Interface Engineering of Alloyed MoS2 x Se2(1- x ) Nanotubes for Enhanced Hydrogen Evolution Reaction Activity.
abstract: Hierarchical MoS2 x Se2(1- x ) nanotubes assembled from several-layered nanosheets featuring tunable chalcogen compositions, expanded interlayer spacing and carbon modification, are synthesized for enhanced electrocatalytic hydrogen evolution reaction (HER). The chalcogen compositions of the MoS2 x Se2(1- x ) nanotubes are controllable by adjusting the selenization temperature and duration while the expanded (002) interlayer spacing varies from 0.98 to 0.68 nm. It is found that the MoS2 x Se2(1- x ) (x = 0.54) nanotubes with expanded interlayer spacing of 0.98 nm exhibit the highest electrocatalytic HER activity with a low onset potential of 101 mV and a Tafel slope of 55 mV dec(-1) . The improved electrocatalytic performance is attributed to the chalcogen composition tuning and the interlayer distance expansion to achieve benefitting hydrogen adsorption energy. The present work suggests a potential way to design advanced HER electrocatalysts through modulating their compositions and interlayer distances.
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.|Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, P. R. China.
authors.forename: Junjun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.
authors.forename: Mei-Hui
authors.initials: MH
authors.lastname: Wu
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.
authors.forename: Zheng-Tian
authors.initials: ZT
authors.lastname: Shi
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.
authors.forename: Miao
authors.initials: M
authors.lastname: Jiang
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.
authors.forename: Wen-Jing
authors.initials: WJ
authors.lastname: Jian
authors.affiliation: Center of Electron Microscopy, Zhejiang University, Zhejiang, 310027, P. R. China.
authors.forename: Zhangru
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: Center of Electron Microscopy, Zhejiang University, Zhejiang, 310027, P. R. China.
authors.forename: Jixue
authors.initials: J
authors.lastname: Li
authors.affiliation: Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, P. R. China.
authors.forename: Chun-Sing
authors.initials: CS
authors.lastname: Lee
authors.affiliation: School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.|Center of Electron Microscopy, Zhejiang University, Zhejiang, 310027, P. R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Xu
keywords: MoS2; composition tuning; electrocatalysts; interfaces; transition-metal dichalcogenides