Rational design of MoSe2-NiSe@carbon heteronanostructures for efficient electrocatalytic hydrogen evolution in both acidic and alkaline media

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 .