Evidence map›Paper›PMID 42056327›Full record

ArticleScientific reports2026

Tailoring copper content in high-entropy oxides for enhanced water oxidation catalysis.

Seyedsaeed Mehrabi-Kalajahi, Seyed Amir Hossein Vasigh, Hassan Yousefi Bavili, Behrouz Shaabani, Maryam Badri, Shadab Akbarpour, Sama Maghoul, Alexei Vagov, Ahmad Ostovari Moghaddam, Mikhail A Varfolomeev

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Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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10 authors.

Seyedsaeed Mehrabi-KalajahiFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran. ss.mehrabikalajahi@gmail.com.
Seyed Amir Hossein VasighFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran.
Hassan Yousefi BaviliDepartment of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA.
Behrouz ShaabaniFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran. shaabani.b@gmail.com.
Maryam BadriFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran.
Shadab AkbarpourFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran.
Sama MaghoulFaculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran.
Alexei VagovHSE University, Moscow, Russia, 101000.
Ahmad Ostovari MoghaddamHSE University, Moscow, Russia, 101000.
Mikhail A VarfolomeevDepartment of Petroleum Engineering, Kazan Federal University, Kazan, Russia, 420008.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

High-entropy oxides (HEOs) have recently gained considerable attention as next-generation electrocatalysts owing to their exceptional compositional flexibility, structural stability, and synergistic multimetal effects. In this study, a series of Cu-modified high-entropy oxide catalysts (HEO-Cu) with different Cu loadings (20%, 30%, 40%, 50%, and 60%) supported on nickel foam (NF) were synthesized via a facile co-precipitation method and comprehensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and X-ray photoelectron spectroscopy (XPS) analyses. The structural results confirmed the formation of a homogeneous single-phase oxide with uniform elemental distribution. Electrochemical measurements revealed that the incorporation of Cu significantly improved the oxygen evolution reaction (OER) performance. The linear sweep voltammetry (LSV) curves showed a remarkable decrease in overpotential from 570 mV for bare NF to 470, 376, 371, 262, and 252 mV at 10 mA/cm for 20%, 30%, 40%, 50%, and 60% Cu loadings, respectively. The HEO-Cu 40%/NF electrode exhibited the lowest overpotential (252 mV) and a Tafel slope of 64.5 mV/dec, indicating the most favorable OER kinetics among all compositions. Electrochemical impedance spectroscopy (EIS) confirmed a significant reduction in charge transfer resistance (Rct) from 212 Ω (NF) to 82 Ω (HEO-Cu 40%/NF), while chronoamperometric stability tests demonstrated that the optimized electrode maintained over 95% of its initial current density after 36,000 s of continuous operation.

Indexed as

Cu-modified catalystsElectrocatalysisHigh-entropy oxidesOxygen evolution reaction (OER)Synergistic effectsWater electrolysis

Identifiers

PMID42056327
PMCPMC13320208

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