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<p>The pursuit of cost-effective, durable, and high-performance photocatalysts remains a key challenge for achieving sustainable hydrogen generation. In this work, we designed and synthesized a novel series of g-C<sub>3</sub>N<sub>4</sub>/CoAl-LDH hybrid nanostructures through a simple hydrothermal process. Their crystallographic framework, surface morphology, elemental distribution, and porosity were systematically examined using XRD, SEM, XPS, and N₂ adsorption–desorption techniques. The cooperative effect between Co<sup>2+</sup> redox-active centers and the hydroxyl-enriched layered double hydroxide surface significantly accelerates hydrogen evolution kinetics, while the tailored band alignment broadens absorption in the visible-light region. Owing to these advantages, the optimized g-C<sub>3</sub>N<sub>4</sub>/CoAl-LDH catalyst delivered an outstanding hydrogen production rate of approximately 3033&#xa0;μmol&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup> under visible-light irradiation, which is more than 7 times higher than that of bare CoAl-LDH (~ 430&#xa0;μmol&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup>). Transient photocurrent measurements further confirmed rapid and stable photo-induced charge transport, highlighting efficient carrier separation under illumination. Moreover, the composite exhibited excellent long-term durability and recyclability, underscoring its strong potential for future applications in photocatalytic hydrogen evolution and wastewater remediation.</p>

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Synergistic g-C3N4/CoAl-LDH heterojunctions for superior visible-light-driven hydrogen evolution and wastewater treatment

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • R. Sridevi,
  • A. Prakasam,
  • M. Karthik,
  • P. M. Anbarasan,
  • K. Deepakavijay

摘要

The pursuit of cost-effective, durable, and high-performance photocatalysts remains a key challenge for achieving sustainable hydrogen generation. In this work, we designed and synthesized a novel series of g-C3N4/CoAl-LDH hybrid nanostructures through a simple hydrothermal process. Their crystallographic framework, surface morphology, elemental distribution, and porosity were systematically examined using XRD, SEM, XPS, and N₂ adsorption–desorption techniques. The cooperative effect between Co2+ redox-active centers and the hydroxyl-enriched layered double hydroxide surface significantly accelerates hydrogen evolution kinetics, while the tailored band alignment broadens absorption in the visible-light region. Owing to these advantages, the optimized g-C3N4/CoAl-LDH catalyst delivered an outstanding hydrogen production rate of approximately 3033 μmol g−1 h−1 under visible-light irradiation, which is more than 7 times higher than that of bare CoAl-LDH (~ 430 μmol g−1 h−1). Transient photocurrent measurements further confirmed rapid and stable photo-induced charge transport, highlighting efficient carrier separation under illumination. Moreover, the composite exhibited excellent long-term durability and recyclability, underscoring its strong potential for future applications in photocatalytic hydrogen evolution and wastewater remediation.