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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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High-Throughput Electron Transfer in Inorganic-Organic Interfacial Electric Field Enabling Selective CO2

Sirong Zou1, Ye Liu2, Guimei Huang1

  • 1College of Chemistry, Huazhong Agricultural University, Wuhan, 430070, P.R. China.

Angewandte Chemie (International Ed. in English)
|October 14, 2025
PubMed
Summary

This study enhances photocatalytic CO2 reduction by engineering CdS surfaces to create electric fields, suppressing hydrogen evolution and boosting CO2 conversion. The novel CdS-COOH/Co(II)-bpy system achieves high CO production rates and selectivity.

Keywords:
CdS nanorodsInterface charge transferNoncovalent interfacesPhotocatalytic CO2 reductionSurface functionalization

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Chemical Engineering

Background:

  • Photocatalytic CO2 reduction is crucial for mitigating climate change but is often limited by competing hydrogen evolution.
  • Efficient charge separation and transfer are key challenges in designing effective photocatalysts.

Purpose of the Study:

  • To develop an innovative strategy for enhancing photocatalytic CO2 reduction by suppressing hydrogen evolution.
  • To engineer inorganic-organic interfaces for high-throughput electron transfer.
  • To investigate the role of surface functionalization on charge transfer dynamics.

Main Methods:

  • Utilized cadmium sulfide (CdS) and cobalt bipyridine as a model system.
  • Engineered CdS surface functionalization with carboxyl (─COOH) and amino (─NH2) groups.
  • Employed in situ and transient spectroscopy techniques for mechanistic investigation.
  • Quantified CO production rate and selectivity of the photocatalytic system.

Main Results:

  • CdS functionalized with ─COOH groups exhibited superior noncovalent interactions and charge transfer compared to ─NH2 groups.
  • The CdS-COOH/Co(II)-bpy system achieved a CO production rate of 2.523 mmol g-1 h-1.
  • High CO selectivity of 96.3% was obtained, indicating efficient suppression of hydrogen evolution.
  • Demonstrated that fast electron delivery favors CO2 participation in proton-electron coupling over direct proton reduction.

Conclusions:

  • Surface engineering of CdS with ─COOH groups effectively creates an electric field at the inorganic-organic interface, promoting efficient charge transfer.
  • The developed strategy successfully suppresses competing hydrogen evolution, enhancing CO2 reduction efficiency.
  • This research provides a comprehensive approach for designing high-performance photocatalysts for CO2 reduction.