Junhua You

With the acceleration of industrialization and increasing human activities, antibiotic pollutants enter aquatic environments through various pathways and pose serious threats to ecological safety and human health. Ofloxacin (OFX), a typical fluoroquinolone antibiotic, is persistent in water media owing to its high chemical stability and poor biodegradability. In this study, MgO/CuFeO₂-based Fenton-type composite catalysts were prepared to investigate their efficiency in removing OFX from water. Among the as-prepared materials, MgO/CuFeO₂-20 wt% exhibited the optimum catalytic activity: under the conditions of 20 mg L⁻¹ initial OFX concentration, 0.5 g L⁻¹ catalyst dosage and 20 mM H₂O₂ at natural pH, it achieved approximately 95% ofloxacin removal within 120 min, with a pseudo-first-order kinetic rate constant k₁ of 0.0461 min⁻¹. Benefiting from MgO modification, the catalyst maintained high degradation efficiency over a broad pH range of 5–9 and retained satisfactory catalytic performance after five consecutive cyclic runs with only minor activity decay. Characterizations including XRD, SEM-TEM, XPS, BET, LSV-EIS and ESR-DMPO verified that the construction of tight MgO-CuFeO₂ heterointerfaces accelerated interfacial electron transfer and promoted the regeneration of Cu⁺/Cu²⁺ and Fe²⁺/Fe³⁺ redox couples. Hydroxyl radicals (·OH) were identified as the dominant reactive oxygen species for pollutant oxidation. This work provides a facile modification strategy to alleviate particle aggregation and metal-ion leaching drawbacks of bare CuFeO₂, offering experimental support for designing high-efficiency delafossite-based heterogeneous Fenton-like catalysts for antibiotic-containing wastewater remediation.

Addressing the kinetic limitations of alkaline HER, this work designs a Pr ₂ O ₃ –Co ₃ Fe ₇ /NC catalyst with abundant oxygen vacancies and multicomponent synergy, providing a practical strategy for developing efficient nonprecious HER electrocatalysts.

Co–Ni-based nanomaterials, as one of the candidate materials for oxygen evolution reaction (OER), have been widely studied.

Different dimensional Co-based MOFs and their derivative materials for electrocatalytic decomposition of water oxygen evolution reaction (OER).

This study aims to investigate the effect of copper (Cu) content in the precursor alloy on the performance of high‐entropy sulfide (HES) electrocatalysts prepared by the hydrothermal method in oxygen evolution reaction (OER). Given the unique multi‐metallic structure of high‐entropy sulfides and their potential excellent electrochemical performance, HES electrocatalysts with different Cu contents were prepared by hydrothermal synthesis in this paper, and the effect of Cu content on the catalyst performance was systematically analyzed. The results show that when the molar ratio of Cu to other metals is 0.5, the performance of the corresponding HES electrode in OER is significantly improved. Specifically, at a current density of 10 mA·cm⁻², which has a lowest overpotential of 232.54 mV with a Tafel slope of 144.85 mV·dec⁻¹ and excellent stability. The improved performance of the HES electrocatalyst can be attributed to the surface morphology optimization, improved conductivity, and enhanced entropy stability brought about by the adjustment of Cu content. In addition, the synergistic effect between metal elements improves the intrinsic activity and active site exposure of the catalyst, and the uniformity and surface consistency of the catalyst also enhance its stability. This study not only provides a theoretical basis for the preparation and application of HES electrocatalysts but also provides a new path for the development of energy conversion and storage technologies.

Electrocatalytic water splitting is a clean and feasible method for hydrogen production, expected to become a key technology for meeting clean energy demands. Transition metal-based nanoparticles, including single-atom catalysts and their compounds, are widely used in electrocatalytic water splitting, but they often suffer from issues like easy agglomeration and poor conductivity. The integration of these nanoparticles with three-dimensional (3D) graphene enhances conductivity and prevents agglomeration, while improving the adsorption and desorption rates of reactants and intermediates on the catalyst surface during electrocatalytic water splitting, thereby boosting energy efficiency. This paper reviews the preparation methods of graphene-based supported electrocatalysts and their applications in oxygen evolution reactions (OERs), further discussing the mechanism by which 3D graphene improves OER performance.