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Preparation and study of sulfide-based electrocatalysts synthesized from NiFeCr layered triple hydroxide precursor for utilization in water splitting applications.
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DOI：10.1016/j.rechem.2026.103257.png)
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Abstract
En 中文
The development of bifunctional electrocatalysts that demonstrate both high efficiency and robust stability for overall water splitting remains a significant challenge in advancing sustainable hydrogen production. In this study, a NiCrFe-layered double hydroxide (LDH) nanostructure was fabricated on nickel foam and subsequently subjected to partial or complete sulfidation using three different sulfidating agents (Na2S, C2H5NS [thioacetamide], and CH4N2S [thiourea]). A variety of detailed characterization methods were employed to analyze the catalysts, including scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). Their electrocatalytic performance was then systematically assessed. Among them, NiFeCr-LDHNF-CH4N2S2 (fully sulfidated with CH4N2S) exhibited the most remarkable activity, requiring a low overpotential to achieve 10 mA cm-2 for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), along with the smallest Tafel slope, signifying rapid reaction kinetics. Electrochemical impedance spectroscopy revealed its low charge-transfer resistance, while cyclic voltammetry and stability tests confirmed excellent durability and a large electrochemical surface area. Furthermore, CrNiFe-LDH-NF-ThU2 demonstrated the highest mass activity compared to benchmark catalysts (Pt and IrO2/RuO2), underscoring its efficiency.
Keywords:
Layered double hydroxides
Electrocatalyst
Water splitting
Sulfur
Tofel slop
Overpotential
Journal
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4.2
Papers:
506
Citations:
6.1K
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