Scholarlink

<p>This study explores a morphology-controlled synthesis strategy for an innovative hybrid nanostructure composed of carbon quantum dots (CQDs) integrated with NiMn₂S₄ nanosheets, designed to enhance the oxygen evolution reaction (OER) performance. Uniform, ultrathin, and regular discrete nanosheet arrays were grown on nickel foam via hydrothermal synthesis followed by calcination at 400&#xa0;°C. The low thickness of the nanosheets increases the number of active sites for the OER. Moreover, the interconnected nanosheet framework facilitates the transport of electrolyte ions and enables efficient bubble release during OER. In addition, the intimate integration of ultrathin nanosheets with the substrate promotes efficient electron transfer and improves long-term stability. Notably, the CQDs/NiMn<sub>2</sub>S<sub>4</sub> hybrid exhibits a low overpotential of 350 mV at a current density of 10&#xa0;mA cm<sup>− 2</sup>, along with excellent stability over 55&#xa0;h of operation. The structure and morphology of the CQDs/NiMn<sub>2</sub>S<sub>4</sub> composite were characterized by field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Raman spectroscopy. This work provides an innovative strategy for enhancing the OER performance of NiMn<sub>2</sub>S<sub>4</sub> through surface decoration with carbon quantum dots for water-splitting applications.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Designing of CQDs-decorated NiMn₂S₄ Nanosheets as Oxygen Evolution Reaction Electrocatalysts for Water Electrolysis

  • 期刊论文

  • 发表日期：

    2026年8月3日

查看全文
  • Mahdiyyeh Sadeghi Amjadi,
  • Habib Ashassi-Sorkhabi,
  • Mir ghasem Hosseini,
  • Bruno G. Pollet,
  • Elnaz Asghari

摘要

This study explores a morphology-controlled synthesis strategy for an innovative hybrid nanostructure composed of carbon quantum dots (CQDs) integrated with NiMn₂S₄ nanosheets, designed to enhance the oxygen evolution reaction (OER) performance. Uniform, ultrathin, and regular discrete nanosheet arrays were grown on nickel foam via hydrothermal synthesis followed by calcination at 400 °C. The low thickness of the nanosheets increases the number of active sites for the OER. Moreover, the interconnected nanosheet framework facilitates the transport of electrolyte ions and enables efficient bubble release during OER. In addition, the intimate integration of ultrathin nanosheets with the substrate promotes efficient electron transfer and improves long-term stability. Notably, the CQDs/NiMn2S4 hybrid exhibits a low overpotential of 350 mV at a current density of 10 mA cm− 2, along with excellent stability over 55 h of operation. The structure and morphology of the CQDs/NiMn2S4 composite were characterized by field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Raman spectroscopy. This work provides an innovative strategy for enhancing the OER performance of NiMn2S4 through surface decoration with carbon quantum dots for water-splitting applications.

Graphical Abstract