Regeneration of iron species for high and stable activity of nickel electrodes in the oxygen evolution reaction

Green Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

A regeneration strategy combined with the tuning of traces iron in electrolyte enabled achieving high activity and enhanced stability nickel electrodes oxygen evolution reaction (OER).

Язык: Английский

---

A Tetranuclear Ni^II₄O₄ Cubane Molecular Complex as an Efficient Electrocatalyst for Oxygen Evolution Reaction: From Synthesis to Mechanistic Insights

Small, Год журнала: 2025, Номер unknown

Опубликована: Май 12, 2025

Abstract The oxygen evolution reaction (OER) is integral to electrochemical energy systems; however, its intrinsic sluggish kinetics necessitate the design of high‐performance electrocatalysts minimize overpotential, enhance durability, and optimize efficiency. Significant efforts have been dedicated developing OER catalysts based on earth‐abundant transition‐metal complexes. Here, efficacy a tetranuclear cubane‐cored Ni(II) complex, [Ni₄(LH)₄(MeOH)]·CHCl₃ ( 1 ), in demonstrated. complex synthesized using tetradentate Schiff‐base ligand, [2‐{( E )‐(2‐hydroxyphenylimino)methyl)‐6‐(hydroxymethyl)‐4‐methylphenol}], characterized by single‐crystal X‐ray diffraction. redox properties are evaluated cyclic voltammetry solid state, which emphasize quasireversible oxidation state metal center. immobilized activated carbon cloth CC referred as CC‐1 , demonstrates efficient catalysis, subsequently activating form Ni(O)OH catalyst. postreaction analysis including UV–vis, FTIR, scanning electron microscopy–energy‐dispersive spectroscopy, photoelectron spectroscopy confirm stability molecular . results demonstrate catalysis with low overpotential 330 mV versus reversible hydrogen electrode Tafel slope 64 dec −1 confirming an effective catalyst alkaline medium deep understanding core mechanisms.

Язык: Английский

---

Surface Engineering of Perovskite Oxide LaCo_0.67Cu_0.33O₃ for Improved Overall Water Splitting Activity

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Perovskite oxides continue demonstrating suboptimal electrocatalytic performance for the oxygen evolution reaction (OER) and hydrogen (HER) due to their inherently low activity, inadequate electronic conductivity, restricted availability of active sites. Defect engineering has attracted significant attention as a promising approach enhancing kinetics. In this study, LaCo0.67Cu0.33O3 (LCCO) composite perovskite electrocatalyst was synthesized using sol-gel method followed by acid etching defect (LCCO-x, where x = 6, 12, 24, 30, indicating treatment time in hours). Particularly, LCCO-24 exhibited high activity improved kinetics both OER HER under alkaline conditions. When employed overall water splitting, it achieved full-cell voltage 1.49 V at current density 10 mA·cm-2, comparable leading noble metal catalysts. Analysis confirmed that enhancement bifunctional attributed increased presence defects increase surface area. This study demonstrates is an effective investigating context electrochemical splitting.

Язык: Английский

---

Surface Interface Engineered and Sulfur Source Inspired Carbon Nanofiber Mediated Growth of NSMO Directly on Nickel Foam for Ultra‐High Energy Density Aqueous Asymmetric Supercapacitors

Advanced Sustainable Systems, Год журнала: 2025, Номер unknown

Опубликована: Май 13, 2025

Abstract To advance energy storage technologies, the development of high‐performance supercapacitor electrodes is paramount. This study presents a novel, binder‐free electrode constructed from earth‐abundant materials. A surface interfaced nanocomposite comprising Ni 3 S 2 and MnO hierarchical nanostructure (NSMO) directly grown on carbon nanofibers (CNF) using hydrothermal method. approach offers scalability cost‐effectiveness for large‐scale applications. The electrode's exceptional electrochemical performance arises synergistic interactions between mixed oxidation states composite structure. It exhibits maximum specific capacitance 1470 F g −1 at 1 , coupled with remarkable stability, retaining 78.94% its delivering Columbic efficiency 99.5% after 15,000 cycles. When integrated into an asymmetric (ASC), demonstrated 215.7 density 67 Wh kg power 750 W excellent cycle life. These results highlight potential hybrid CNF@NSMO as sustainable candidate next‐generation

Язык: Английский

---

Iron-decorated nickel selenide nanostructures with enhanced electrocatalytic activity for the oxygen evolution reaction

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 143, С. 235 - 249

Опубликована: Июнь 5, 2025

Язык: Английский

---

Electrochemical performance of Ni–Fe–Co spinel anodes with a nanorod structure in anion exchange membrane water electrolyzers

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 144, С. 124 - 132

Опубликована: Июнь 6, 2025

Язык: Английский

---