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Efficient Visible-Light-Driven Carbon Dioxide Reduction using a Bioinspired Nickel Molecular Catalyst.

Jing Zhang1, Ping She1, Qiang Xu1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China.

Chemsuschem
|February 7, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a bioinspired nickel catalyst for efficient photochemical reduction of carbon dioxide (CO2) to carbon monoxide (CO) using visible light. The catalyst demonstrates high selectivity and a significant turnover number, paving the way for sustainable CO2 utilization.

Keywords:
CO2 reductionNickel complexhomogeneous catalysismolecular catalystvisible light

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Area of Science:

  • Inorganic Chemistry
  • Photocatalysis
  • Sustainable Chemistry

Background:

  • Developing efficient catalysts for carbon dioxide (CO2) reduction is crucial for sustainable energy and mitigating climate change.
  • Bioinspired molecular catalysts offer promising alternatives to traditional heterogeneous systems for CO2 conversion.
  • Nickel-based complexes are actively investigated for their catalytic activity in redox reactions.

Purpose of the Study:

  • To synthesize and characterize a novel nickel-based molecular catalyst for the photochemical reduction of CO2.
  • To evaluate the catalyst's efficiency, selectivity, and stability under visible light irradiation.
  • To explore the potential of this bioinspired catalyst for practical CO2 utilization.

Main Methods:

  • Synthesis and characterization of the nickel catalyst [Ni(N2S2)]Cl2 using techniques including LC-HRMS and X-ray crystallography.
  • Photocatalytic CO2 reduction experiments conducted under homogeneous conditions with a photosensitizer ([Ru(bpy)3]Cl2) and sacrificial electron donor (BIH).
  • Analysis of reaction products, selectivity, turnover number (TON), turnover frequency (TOF), and apparent quantum yield (AQY).

Main Results:

  • The nickel catalyst exhibited a distorted octahedral geometry around the Ni(II) center.
  • High selectivity (89%) towards carbon monoxide (CO) was achieved.
  • A remarkable turnover number (TON) of 7991 was recorded over 8 hours, with a TOF of 1079 h⁻¹ and AQY of 1.08%.

Conclusions:

  • The bioinspired nickel molecular catalyst is effective for the photochemical reduction of CO2 to CO under visible light.
  • The catalyst demonstrates high efficiency, selectivity, and stability, making it a promising candidate for CO2 conversion.
  • Controlled experiments confirmed the essential roles of the catalyst, light, and electron donor in the reduction process.