3D-Cobalt-Dicyanamide-Derived 2D-Layered-Co(OH)2-Based Catalyst for Light-Driven Hydrogen Evolution
Sina Sadigh Akbari1, Ferdi Karadas1,2
1Department of Chemistry, Faculty of Science, Bilkent University, 06800 Ankara, Turkey.
ACS Omega
|February 26, 2024
Summary
3D cobalt dicyanamide coordination polymers transform into 2D catalysts for efficient hydrogen evolution. The dicyanamide ligand and triethylamine are key to this robust photocatalytic activity.
Area of Science:
- Materials Science
- Catalysis
- Photochemistry
Background:
- 3D coordination polymers offer precise control over catalytic sites.
- Developing efficient and robust catalysts is crucial for sustainable energy solutions.
Purpose of the Study:
- To investigate the transformation of a 3D cobalt dicyanamide coordination polymer (Co-dca) into a 2D layered structure.
- To evaluate the photocatalytic activity of the derived 2D material for hydrogen evolution.
- To understand the role of the dicyanamide ligand and triethylamine in the transformation and catalytic performance.
Main Methods:
- Synthesis of 3D cobalt dicyanamide coordination polymer.
- Partial conversion to a 2D layered hydroxide-oxyhydroxide structure under photocatalytic conditions.
- Activity assessment using a [Ru(bpy)3]2+/triethylamine (TEA) system for hydrogen evolution.
- Characterization studies to elucidate structural and chemical modifications.
Main Results:
- The 3D Co-dca partially converted to a 2D layered hydroxide-oxyhydroxide structure.
- The derived catalyst achieved a high hydrogen evolution rate of 28.3 mmol h-1 g-1.
- Sustained catalytic activity for over 12 hours was observed.
- The dicyanamide ligand was identified as critical for catalyst modification and performance.
- Triethylamine was confirmed as an essential hydrolyzing agent for the transformation.
Conclusions:
- Metal dicyanamides serve as effective templates for generating active and stable photocatalysts.
- Ligand design within coordination polymers is vital for tailoring catalytic properties.
- Understanding transformation mechanisms under reaction conditions can lead to improved catalyst design.
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