Solar energy conversion into hydrogen (H 2 ) energy has attracted much attention. However, the low light utilization rate and fast carrier recombination of photocatalysts extremely limit the practical application of photocatalytic H 2 production. In this paper, MoSe 2 -NiSe with abundant active sites and interfacial electronic structures as dual co-catalysts were assembled on g-C 3 N 4 nanosheets (NSs) vis a solvothermal reaction process. MoSe 2 -NiSe/g-C 3 N 4 NSs composite exhibited improved light absorption and photoelectrochemical properties. The photocatalytic H 2 production rate of MoSe 2 -NiSe/g-C 3 N 4 composite achieved 2379.04 μmol·h −1 ·g −1 , which is 99.25, 1.44, and 3.67 times those of pure g-C 3 N 4 nanosheets (23.97 μmol·h −1 ·g −1 ), MoSe 2 /C 3 N 4 (1654.57 μmol·h −1 ·g −1 ), and NiSe/C 3 N 4 (649.08 μmol·h −1 ·g −1 ), respectively. The apparent quantum efficiency (AQE) value of MoSe 2 -NiSe/g-C 3 N 4 achieved 4.07 % under light at λ = 370 nm. The corresponding characterization and experiments proved that 2D ultrathin g-C 3 N 4 NSs with a large surface area and short charge-transfer distance could facilitate light scattering and the transport of photoexcited electrons. MoSe 2 -NiSe, as a dual co-catalyst, showed strong electronic synergistic interaction between the interfaces, thus improving the conductivity and promoting the electron transfer process.
Zhi Li,Minglong Sun,Yalin Li,Ziang Liu,Dongxiang Zhang,Yingmin Liu,Xinghui He,Mo-Jie Sun
Metal–organic frameworks (MOFs) are crystalline porous materials for storage and energy conversion applications with three-dimensional pore structure, high porosity, and specific surface area, which are widely utilized in electrocatalysis. Herein, MoSe2/NiSe composites were synthesized by selenization reaction using NiMOF as the precursor. The composites were hollow nanoflower structures with a synergistic effect between MoSe2 and NiSe to promote rapid electron transfer, which exhibited good hydrogen evolution reaction performance in an alkaline medium. At a current density of 10 mA/cm2, the HER overpotential reaches 80 mV, the Tafel slope is 33.86 mV/dec, and the material has good stability, with polarization curves remaining essentially unchanged after 3000 cycles. These results indicate that the method has a promising application in the preparation of efficient and sustainable catalysts for hydrogen production in alkaline medium.
The development of hydrogen evolution catalysts from earth-abundant elements with highly active and stable activity are crucial for the promotion of more energy and cost-efficient hydrogen production . Herein, a facile one-step hydrothermal approach is proposed to fabricate 3D hierarchical microcages composed of MoSe 2 -NiSe@carbon nanosheets for the efficient electro-catalytic hydrogen evolution reaction (HER) by water hydrolysis. The heterostrucutres were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy , scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The nanohybrids of MoSe 2 -NiSe are constructed by in situ combination of hexagonal NiSe and MoSe 2 , where the high quality vertical heterostructure can benefit the electrons transfer from metallic NiSe to the MoSe 2 matrix, accomplishing the electronic modulation of MoSe 2 -NiSe@carbon catalysts for robust electrocatalytic performance. The optimal MoSe 2 -NiSe@carbon exhibits excellent HER catalytic performance and superior durability in both acidic and alkaline medium .
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