Designing
advanced electrocatalysts for hydrogen evolution reaction
is of far-reaching significance. Active sites and conductivity play
vital roles in such a process. Herein, we demonstrate a heteronanostructure
for hydrogen evolution reaction, which consists of metallic 1T-MoS2 nanopatches grown on the surface of flexible single-walled
carbon nanotube (1T-MoS2/SWNT) films. The simulated deformation
charge density of the interface shows that 0.924 electron can be transferred
from SWNT to 1T-MoS2, which weakens the absorption energy
of H atom on electron-doped 1T-MoS2, resulting in superior
electrocatalytic performance. The electron doping effect via interface
engineering renders this heteronanostructure material outstanding
hydrogen evolution reaction (HER) activity with initial overpotential
as small as approximately 40 mV, a low Tafel slope of 36 mV/dec, 108
mV for 10 mA/cm2, and excellent stability. We propose that
such interface engineering could be widely used to develop new catalysts
for energy conversion application.
Two-dimensional stable metallic 1T-MoSe with expanded interlayer spacing of 10.0 Å in situ grown on SWCNTs film is fabricated via a one-step solvothermal method. Combined with X-ray absorption near-edge structures, our characterization reveals that such 1T-MoSe and single-walled carbon nanotubes (abbreviated as 1T-MoSe/SWCNTs) hybridized structure can provide strong electrical and chemical coupling between 1T-MoSe nanosheets and SWCNT film in a form of C-O-Mo bonding, which significantly benefits a high-efficiency electron/ion transport pathway and structural stability, thus directly enabling high-performance lithium storage properties. In particular, as a flexible and binder-free Li-ion anode, the 1T-MoSe/SWCNTs electrode exhibits excellent rate capacity, which delivers a capacity of 630 mAh/g at 3000 mA/g. Meanwhile, the strong C-O-Mo bonding of 1T-MoSe/SWCNTs accommodates volume alteration during the repeated charge/discharge process, which gives rise to 89% capacity retention and a capacity of 971 mAh/g at 300 mA/g after 100 cycles. This synthetic route of a multifunctional MoSe/SWCNTs hybrid might be extended to fabricate other 2D layer-based flexible and light electrodes for various applications such as electronics, optics, and catalysts.
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