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<p>We synthesized a series of cobalt–vanadium-layered double hydroxides (CoV-LDHs) at varying temperatures through a hydrothermal method and evaluated their electrocatalytic performance for the oxygen evolution reaction (OER). The morphology of the CoV-LDHs was systematically characterized using scanning electron microscopy (SEM). X-ray diffraction (XRD) confirmed the crystalline phases, while x-ray photoelectron spectroscopy (XPS) provided insights into the oxidation states of the elements within the LDH. The electrochemical properties were investigated using linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). Among the synthesized samples, the CoV-LDH obtained at 170&#xa0;°C exhibited the highest catalytic activity, with the lowest overpotential and charge transfer resistance, attributed to its optimal mixed morphology. Tafel slope and current density at 100 mA cm<sup>−2</sup> were 47.5&#xa0;mV dec<sup>−1</sup> and 1.43 V, respectively, for optimal mixed morphology. Stability of the 170&#xa0;°C CoV-LDH, which maintained its performance, exhibits only a 6.6% increase in overpotential after 10&#xa0;days of continuous operation in 1&#xa0;M KOH.</p>

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Morphology-Driven Enhancement of Oxygen Evolution Reaction: Tunable CoV-Layered Double Hydroxides Synthesized via Hydrothermal Control

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Ali M. Hussein,
  • Narinderjit Singh Sawaran,
  • Luma Hussain Saleh,
  • G. PadmaPriya,
  • Subhashree Ray,
  • Amrita Pal,
  • Vimal Arora,
  • Akmal Abilkasimov,
  • Mutabar Latipova,
  • Aseel Smerat,
  • Wissam Aziz Yousif

摘要

We synthesized a series of cobalt–vanadium-layered double hydroxides (CoV-LDHs) at varying temperatures through a hydrothermal method and evaluated their electrocatalytic performance for the oxygen evolution reaction (OER). The morphology of the CoV-LDHs was systematically characterized using scanning electron microscopy (SEM). X-ray diffraction (XRD) confirmed the crystalline phases, while x-ray photoelectron spectroscopy (XPS) provided insights into the oxidation states of the elements within the LDH. The electrochemical properties were investigated using linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). Among the synthesized samples, the CoV-LDH obtained at 170 °C exhibited the highest catalytic activity, with the lowest overpotential and charge transfer resistance, attributed to its optimal mixed morphology. Tafel slope and current density at 100 mA cm−2 were 47.5 mV dec−1 and 1.43 V, respectively, for optimal mixed morphology. Stability of the 170 °C CoV-LDH, which maintained its performance, exhibits only a 6.6% increase in overpotential after 10 days of continuous operation in 1 M KOH.