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<p>In the face of the global energy crisis and the pressing need for CO₂ reduction, developing efficient CO₂ photocatalytic conversion technologies is of significant. In this study, a new artificial photosynthesis system for reducing CO<sub>2</sub> to CH<sub>4</sub> was established by imitating natural photosynthesis. Porphyrins in plants are the carriers of photosynthesis in nature, composite catalysts were prepared by bimetallic porphyrin and TiO<sub>2</sub> nanotube arrays (TiO<sub>2</sub>NTs). Meanwhile, because of the defects of poor conductivity of the porphyrin-TiO<sub>2</sub> composite catalyst, the Ni-Co bimetallic porphyrins (Ni-CoTCPP) / graphene oxide (GO) /TiO<sub>2</sub>NTs composite photocatalyst was constructed by loading GO to effectively separate electron-hole and further improve the reduction performance. Experimental results show that this composite material exhibits significantly enhanced CO₂ photocatalytic reduction activity under simulated solar light, with a CH₄ production rate of up to 61.55 µmol·cm⁻²·h⁻¹ and an apparent quantum efficiency of 1.2%, approximately 8.6 times higher than that of pure TiO₂NTs. Furthermore, based on the results of photocatalytic evaluation and photo(electro)chemical analysis, a possible mechanism for CO₂ photoreduction over the Ni-CoTCPP/GO/TiO₂NTs photocatalyst was proposed.</p> Graphical Abstract

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Graphene Oxide Modified Ni-CoTCPP/TiO2NTs Heterojunction for Boosting Photocatalytic CO2 Reduction

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Tongxin Xiao,
  • Xige Wu,
  • Hongbao Liang,
  • Kangyue Qiao,
  • Ying Chen,
  • Chao Sui,
  • Songyao Du,
  • Yue Wang

摘要

In the face of the global energy crisis and the pressing need for CO₂ reduction, developing efficient CO₂ photocatalytic conversion technologies is of significant. In this study, a new artificial photosynthesis system for reducing CO2 to CH4 was established by imitating natural photosynthesis. Porphyrins in plants are the carriers of photosynthesis in nature, composite catalysts were prepared by bimetallic porphyrin and TiO2 nanotube arrays (TiO2NTs). Meanwhile, because of the defects of poor conductivity of the porphyrin-TiO2 composite catalyst, the Ni-Co bimetallic porphyrins (Ni-CoTCPP) / graphene oxide (GO) /TiO2NTs composite photocatalyst was constructed by loading GO to effectively separate electron-hole and further improve the reduction performance. Experimental results show that this composite material exhibits significantly enhanced CO₂ photocatalytic reduction activity under simulated solar light, with a CH₄ production rate of up to 61.55 µmol·cm⁻²·h⁻¹ and an apparent quantum efficiency of 1.2%, approximately 8.6 times higher than that of pure TiO₂NTs. Furthermore, based on the results of photocatalytic evaluation and photo(electro)chemical analysis, a possible mechanism for CO₂ photoreduction over the Ni-CoTCPP/GO/TiO₂NTs photocatalyst was proposed.

Graphical Abstract