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<p>The development of multifunctional nanomaterials for renewable energy and environmental remediation has accelerated in response to growing sustainability demands. However, many single-component systems face limitations such as poor charge separation and low catalytic efficiency. To overcome these challenges, we present the hydrothermal synthesis of a novel molybdenum disulfide–zinc sulfate–multi-walled carbon nanotube (MoS<sub>2</sub>–ZnS–MWCNT) nanocomposite that integrates the layered structure of MoS<sub>2</sub>, the photocatalytic properties of ZnS, and the high conductivity of MWCNTs. This ternary composite was systematically investigated for its dual functionality in the oxygen evolution reaction (OER) and photocatalytic dye degradation. Structural and morphological characterizations (X-ray diffraction, Field emission scanning electron microscopy, Transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy) confirmed successful hybridization and uniform distribution of the components. Superior electrocatalytic activity was demonstrated by a low overpotential of 392&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> and a Tafel slope of 99.5&#xa0;mV&#xa0;dec<sup>−1</sup>. This enhanced performance, coupled with a high electrochemical surface area (47.5&#xa0;mA&#xa0;cm<sup>−2</sup>), points to significantly improved reaction kinetics and a greater abundance of accessible active sites resulting from synergistic interactions. Under simulated sunlight, the composite efficiently degraded Amido Black 10B, outperforming many binary and pristine materials reported in the literature. These findings suggest that the MoS<sub>2</sub>–ZnS–MWCNT nanocomposite is a promising multifunctional catalyst with potential applications in water splitting and wastewater treatment, addressing a crucial need in integrated energy–environmental technologies.</p>

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A hydrothermally engineered MoS2–ZnS–MWCNT nanocomposite for superior oxygen evolution and visible light photocatalytic dye degradation

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Ramanjulu Mandam,
  • Hari Babu Boppudi,
  • Charan Kuchi,
  • M. Chandra Sekhar,
  • P. V. Chandrasekar,
  • M. Jagadeesh,
  • Anees A. Ansari,
  • Nandarapu Purushotham Reddy,
  • P. Sreedhara Reddy

摘要

The development of multifunctional nanomaterials for renewable energy and environmental remediation has accelerated in response to growing sustainability demands. However, many single-component systems face limitations such as poor charge separation and low catalytic efficiency. To overcome these challenges, we present the hydrothermal synthesis of a novel molybdenum disulfide–zinc sulfate–multi-walled carbon nanotube (MoS2–ZnS–MWCNT) nanocomposite that integrates the layered structure of MoS2, the photocatalytic properties of ZnS, and the high conductivity of MWCNTs. This ternary composite was systematically investigated for its dual functionality in the oxygen evolution reaction (OER) and photocatalytic dye degradation. Structural and morphological characterizations (X-ray diffraction, Field emission scanning electron microscopy, Transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy) confirmed successful hybridization and uniform distribution of the components. Superior electrocatalytic activity was demonstrated by a low overpotential of 392 mV at 10 mA cm−2 and a Tafel slope of 99.5 mV dec−1. This enhanced performance, coupled with a high electrochemical surface area (47.5 mA cm−2), points to significantly improved reaction kinetics and a greater abundance of accessible active sites resulting from synergistic interactions. Under simulated sunlight, the composite efficiently degraded Amido Black 10B, outperforming many binary and pristine materials reported in the literature. These findings suggest that the MoS2–ZnS–MWCNT nanocomposite is a promising multifunctional catalyst with potential applications in water splitting and wastewater treatment, addressing a crucial need in integrated energy–environmental technologies.