Ordered colloidal clusters constructed by nanocrystals with valence for efficient CO₂ photoreduction

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Constructing complex colloidal clusters (CCs) comparable to molecular clusters is challenging due to limitations in building blocks and directional bonding.
• Anisotropic Prussian blue analog nanocrystals (NCs) offer potential for creating ordered colloidal structures.

Purpose of the Study:

• To develop a strategy for organizing anisotropic NCs into CCs with open, highly ordered structures.
• To realize colloidal analogs of zeolitic clathrate structures.
• To investigate the catalytic activity of these novel CCs for CO2 photoreduction.

Main Methods:

• Utilizing crystallographic or morphological anisotropy of NCs.
• Employing epitaxial growth, oriented attachment, and local packing for directional interactions.
• Characterizing interparticle interactions through enthalpic and entropic valences, analogous to hybridized atomic orbitals.

Main Results:

• Successfully organized anisotropic NCs into CCs with open, highly ordered structures, mimicking zeolitic clathrate frameworks.
• Demonstrated that interparticle interactions can be attributed to enthalpic and entropic valences.
• Achieved significantly enhanced catalytic activity for CO2 photoreduction due to the multilevel porous structures of the CCs.

Conclusions:

• Established fundamental insights into directional bonding among NCs.
• Opened a new pathway for designing unique CCs with unprecedented structures.
• Highlighted the potential of these CCs for advanced applications, particularly in catalysis.