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Amorphous flower-like molybdenum-sulfide-@-nitrogen-doped-carbon-nanofiber film for use in the hydrogen-evolution reaction

Zhang, Xiaoyan, Li, Libo, Guo, Yaxiao, Liu, Dong, You, Tianyan
Journal of colloid and interface science 2016 v.472 pp. 69-75
carbon nanofibers, carbonization, catalytic activity, electrochemistry, electrodes, electron transfer, energy conversion, hydrogen production, molybdenum, nanoparticles, nitrogen, sulfides
A novel amorphous flower-like molybdenum sulfides@nitrogen doped carbon nanofibers (MoSx@NCNFs) films are successfully synthesized by combining electrospinning, carbonization and a mild hydrothermal process. NCNFs, as a conductive substrate, can accelerate the electron transfer rate and depress the aggregation of MoSx nanoparticles. The resultant amorphous flower-like MoSx on NCNFs exposes abundant S²⁻/S2²⁻ active edge sites which is of great importance for hydrogen evolution reaction (HER) catalytic performance. Electrochemical measurements demonstrate the superior electrocatalytic activity of MoSx@NCNFs toward HER deriving from the synergistic effect between NCNFs and amorphous MoSx. The overpotential is only 137mV to reach the current density of 10mAcm⁻² with a Tafel slope of 41mVdecade⁻¹ at MoSx@NCNFs. Meanwhile, MoSx@NCNFs exhibits satisfactory long-time stability for HER. Noteworthy, the obtained composites show a free-standing structure which can be directly used as electrode materials. This work provides a feasible way to design promising noble-metal free electrocatalysts in the aspect of energy conversion.