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A First-principles Study of Ultrathin Molybdenum Sulfides Nanowires: Electronic and Catalytic Hydrogen Evolution Properties
武晓君
Author NameAffiliationE-mail
武晓君 中国科学技术大学材料科学与工程系 xjwu@ustc.edu.cn 
Abstract:
Molybdenum sulfides nanomaterials, such as one-dimensional (1D) nanotube, nanoribbons, and two-dimensional (2D) nanosheets, have attracted intensive research interests for their novel electronic, optical, and catalytic properties. On the basis of first-principles calculation, here, we report a new series of 1D ultrathin molybdenum sulfides nanowires, including MoS3, Mo3S6 and Mo6S10 nanowires. Our results demonstrate that these ultrathin nanowires are both thermal and lattices dynamically stable, confirmed with the calculated phonon spectrum and Born-Oppenheimer molecular dynamic simulation at the temperature up to 1000K. The calculated elastic constant is 21.33, 103.22 and 163.00 eV/? for MoS3, Mo3S6 and Mo6S10 nanowires, respectively. MoS3 and Mo3S6 nanowires are semiconductors with band gap of 1.55 and 0.46 eV, while Mo6S10 nanowires is metal, implying their potential applications in electronics and optoelectronics. In particular, ultrathin molybdenum sulfides nanowires can be used as catalysts for hydrogen evolution reaction. The calculated Gibbs free energy change for hydrogen evolution is about -0.05 eV for MoS3 nanowire, comparable with those of Pt and H-MoS2. The prediction of these 1D molybdenum sulfides nanowires may enrich the 1D family molybdenum sulfides and make a supplement to understand the high performance of hydrogen evolution reaction in transition-metal dichalcogenides.
Key words:  first-principles calculations, molybdenum sulfide nanowire, HER
FundProject:
A First-principles Study of Ultrathin Molybdenum Sulfides Nanowires: Electronic and Catalytic Hydrogen Evolution Properties
武晓君
摘要:
Molybdenum sulfides nanomaterials, such as one-dimensional (1D) nanotube, nanoribbons, and two-dimensional (2D) nanosheets, have attracted intensive research interests for their novel electronic, optical, and catalytic properties. On the basis of first-principles calculation, here, we report a new series of 1D ultrathin molybdenum sulfides nanowires, including MoS3, Mo3S6 and Mo6S10 nanowires. Our results demonstrate that these ultrathin nanowires are both thermal and lattices dynamically stable, confirmed with the calculated phonon spectrum and Born-Oppenheimer molecular dynamic simulation at the temperature up to 1000K. The calculated elastic constant is 21.33, 103.22 and 163.00 eV/? for MoS3, Mo3S6 and Mo6S10 nanowires, respectively. MoS3 and Mo3S6 nanowires are semiconductors with band gap of 1.55 and 0.46 eV, while Mo6S10 nanowires is metal, implying their potential applications in electronics and optoelectronics. In particular, ultrathin molybdenum sulfides nanowires can be used as catalysts for hydrogen evolution reaction. The calculated Gibbs free energy change for hydrogen evolution is about -0.05 eV for MoS3 nanowire, comparable with those of Pt and H-MoS2. The prediction of these 1D molybdenum sulfides nanowires may enrich the 1D family molybdenum sulfides and make a supplement to understand the high performance of hydrogen evolution reaction in transition-metal dichalcogenides.
关键词:  first-principles calculations, molybdenum sulfide nanowire, HER
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