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 .
Doping a third element or external functional components into binary alloy nanostructured catalysts typically significantly enhances their electrocatalytic performance. This study demonstrates that doping nickel selenide (NiSe2) with approximately10at%iron (Fe) is an effective strategy for improving its oxygen evolution reaction (OER) catalytic activity. The resulting Ni0.9Fe0.1Se2undergoes a structural transformation from its original nanodendritic morphology and exhibits outstanding OER catalytic performance in alkaline media. It achieves a low overpotential of231mVat a current density of10mAcm−2, which is approximately30%lower than that of NiSe2(301mV). The Tafel slope of Ni0.9Fe0.1Se2is116mVdec−1. However, degradation observed after 5 h of stability testing suggests that the doping process requires further optimization.
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