Interfacial Electronic Structure Engineering of NiCo₂Se₄ and NiTe₂ Nanorods for Enhanced Hydrogen Evolution Reaction

Finding the best candidates with outstanding electrocatalytic capabilities for the hydrogen evolution reaction is essential for realizing large-scale hydrogen production through electrolysis. In this study, we synthesized NiCo₂Se₄ (NCS) and NiTe₂ (NT) nanorod arrays using a hydrothermal method. The confirmation of catalyst formation was achieved through X-ray diffraction analysis, electron microscopy imaging, and X-ray photoelectron spectroscopy. Leveraging the plentiful heterointerfaces and synergistic effects arising from the incorporation of bimetallic components, the NCS/NT electrocatalyst demonstrates remarkable efficacy in catalyzing the hydrogen evolution reaction. It achieves a minimal overpotential of 163 mV to attain a current density of 50 mA cm^-2, showcasing exceptional catalytic activity. Further exploration has revealed that the engineering of heterogeneous interfaces and the morphology of nanorods not only guarantee the exposure of numerous active sites and expedite electron-mass transfer but also trigger electron modulation. Such modulation serves to fine-tune the adsorptive and desorptive dynamics of reaction intermediates, culminating in an enhancement of the catalyst's inherent activity. This study illuminates the novel composite electrocatalyst with robust synergy, highlighting the pivotal role of their unique nanostructures in achieving high-efficiency hydrogen production via electrolysis.