One-Step Hydrothermal Synthesis of Mo-Doped Ni₃S₂ Nanorods for Efficient Hydrogen Evolution Reaction

Abstract

In recent years, the development of catalysts for the transition-metal sulfide hydrogen evolution reaction (HER) has received extensive attention. However, the design of low-cost transition-metal sulfide-based catalysts remains a great challenge due to slow water dissociation kinetics and poor long-term stability of the catalysts during the alkaline HER. In this paper, we report the Mo-doped Ni3S2 nanorods (Mo-Ni3S2 NRs) materials prepared by a facile one-step solvothermal method. The doping of Mo accelerates the dissociation of water, increases the electron transport capacity of Ni3S2, and improves the hydrogen adsorption capacity of Ni3S2. The introduction of NH4OH induces the growth of oriented nanorods of Ni3S2 and exposes the high-index crystallographic surface of Ni3S2. The optimized Mo-Ni3S2 NRs catalyst presents low overpotentials of 37.7 mV to reach a current density of 10 mA cm–2 in 1.0 M KOH, and outstanding durability of 24 h could be achieved for the HER.

Enhanced hydrogen evolution reaction via regulating the adsorbability between 2D CoO nanosheets and CC substrate

“…The phenomenon that electrocatalysts in situ grown or converted on the conductive substrates show enhanced HER performance has also been found in relevant reports. 43–45 The superior catalytic activity of the CoO/CC nanosheets compared to CoO (aq. )/CC further demonstrates that the interaction between the electrode materials and the substrate strongly influences the activities of the electrocatalysts.…”

Retraction

“…17 Lu et al reported the successful modification of the electronic structure of Ni 3 S 2 by Mo doping, accelerating the dissociation of water and improving the hydrogen adsorption capacity of Ni 3 S 2 . 18 The catalytic capability of electronically tuned catalysts is ultimately attributed to the optimized adsorption energies of the reaction intermediates. Recently, researchers have looked beyond this paradigm and noted the importance of spin polarization under a magnetic field for electrochemical reactions.…”

“…For example, Li et al fabricated Mo‐doped amorphous Ni 3 S 2 nanosheets, and the introduction of Mo enhanced the adsorption ability of Ni active sites to the active intermediates of HER, leading to an excellent overall water‐splitting performance 17 . Lu et al reported the successful modification of the electronic structure of Ni 3 S 2 by Mo doping, accelerating the dissociation of water and improving the hydrogen adsorption capacity of Ni 3 S 2 18 …”

Unveiling the Transformative Potential of SWCNT/In2O3 Heterostructures as High-Performance Catalysts for Overall Water Splitting

“…Various types of heterostructures, nanocomposites, hybrids, different metal atoms, and single-atom dopants have been explored to modulate nanomaterials' surface morphology, chemical properties, and electronic structure. 20 Recently, graphene, reduced graphene oxide, heteroatom-doped graphene structures, and singlewalled carbon nanotubes (SWCNTs) have also emerged as an alternative because of their excellent electronic, mechanical, and chemical properties and applied to develop novel heterostructures for various applications. However, these heterostructure catalysts are costly and suffer from low electrocatalytic activities and long-term stability.…”

“…The researchers have implemented different means to address the above-mentioned weaknesses and issues of metal oxide semiconductors. Various types of heterostructures, nanocomposites, hybrids, different metal atoms, and single-atom dopants have been explored to modulate nanomaterials’ surface morphology, chemical properties, and electronic structure . Recently, graphene, reduced graphene oxide, heteroatom-doped graphene structures, and single-walled carbon nanotubes (SWCNTs) have also emerged as an alternative because of their excellent electronic, mechanical, and chemical properties and applied to develop novel heterostructures for various applications.…”