Tailoring oxygen vacancies in CoSX-LDH electrocatalysts to boost bifunctional water splitting performance

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-03-17 DOI:10.1016/j.matlet.2025.138412

José Béjar , Juan Pablo F. Rebolledo-Chávez , Lillian G. Ramírez-Palma , Juan Manuel Olivares Ramírez , Anabel D. Delgado , Alfredo Aguilar Elguezabal , Noé Arjona , Lorena Álvarez–Contreras

引用次数: 0

Abstract

In this work, a straightforward synthesis method to obtain defect-engineered ZIF-derived bifunctional electrocatalysts designed for HER and OER applications is reported. The catalysts, based on CoS_x or NiCoS_x in heterojunction with NiFe-LDH, display notable enhancements in catalytic performance due to oxygen vacancies. The defect-rich NiCoS_x-LDH OV catalyst achieved an impressive OER overpotential of 310 mV and a low Tafel slope of 21 mV/dec. For HER, NiCoS_x-LDH OV exhibited an onset potential of −0.180 V vs RHE with a Tafel slope of 130 mV/dec, and an overall bifunctional capability of ΔE at 50 mA cm⁻² of 1.90 V. Stability tests demonstrated excellent catalytic durability, maintaining consistent current densities over 24 h.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive