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<p>This study developed a bio-semiconductor composite photocatalytic system (Gs/CdS) based on the microalgae <i>Galdieria sulphuraria</i> (Gs) template, aiming at the major bottlenecks faced by traditional semiconductor materials (such as CdS) in CO<sub>2</sub> reduction: the susceptibility to photocorrosion, high carrier recombination rate. By taking advantage of the synergistic effect between the natural active substances of microalgae and semiconductors, a new type of material with both efficient photoelectrocatalytic performance and low-cost characteristics was constructed. Experiments show that the phycobilin of Gs optimizes the charge separation efficiency through dye sensitization. The Faraday efficiency of the composite material reaches 67.20%, the methanol yield is 28.42 µmol·h⁻¹·cm⁻², and the cycling stability is excellent. Furthermore, the antenna molecules of microalgae and the photocatalytic process of CdS form a dye-sensitized effect, providing a green and sustainable strategy for the resource utilization of CO<sub>2</sub>.</p> Graphical Abstract

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Low-Cost Microalgae-Templated CdS Composite for CO2 Utilization: Dye Sensitization of Phycobiliproteins and Carbon Dioxide Reduction

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Wenke Zhang,
  • Yuantao Chen,
  • Wei Zhang,
  • Yu Xiao,
  • Haibo Mao

摘要

This study developed a bio-semiconductor composite photocatalytic system (Gs/CdS) based on the microalgae Galdieria sulphuraria (Gs) template, aiming at the major bottlenecks faced by traditional semiconductor materials (such as CdS) in CO2 reduction: the susceptibility to photocorrosion, high carrier recombination rate. By taking advantage of the synergistic effect between the natural active substances of microalgae and semiconductors, a new type of material with both efficient photoelectrocatalytic performance and low-cost characteristics was constructed. Experiments show that the phycobilin of Gs optimizes the charge separation efficiency through dye sensitization. The Faraday efficiency of the composite material reaches 67.20%, the methanol yield is 28.42 µmol·h⁻¹·cm⁻², and the cycling stability is excellent. Furthermore, the antenna molecules of microalgae and the photocatalytic process of CdS form a dye-sensitized effect, providing a green and sustainable strategy for the resource utilization of CO2.

Graphical Abstract