A Multifunctional Co-Based Metal-Organic Framework as a Platform for Proton Conduction and Ni trophenols Reduction

Area of Science:

• Materials Science
• Chemistry
• Clean Energy Technologies

Background:

• Developing proton conduction materials is crucial for clean energy but remains challenging.
• Metal-organic frameworks (MOFs) offer tunable structures for advanced material applications.

Purpose of the Study:

• To synthesize and characterize a stable cobalt-based MOF (LCUH-103) for proton conduction.
• To enhance the proton conductivity of LCUH-103 by incorporating imidazole.
• To evaluate the catalytic activity of LCUH-103 as a support for palladium nanoparticles.

Main Methods:

• Hydrothermal synthesis of the cobalt-based MOF, LCUH-103.
• Encapsulation of imidazole into LCUH-103 channels to create Im@LCUH-103.
• Wetness impregnation of palladium nanoparticles onto LCUH-103 to form Pd@LCUH-103.
• Proton conductivity measurements at varying temperature and humidity.
• Catalytic evaluation of Pd@LCUH-103 for nitrophenol reduction.

Main Results:

• LCUH-103 exhibits excellent chemical and thermal stability, retaining its structure in acidic and alkaline solutions.
• LCUH-103 shows a proton conductivity of 1.25 × 10⁻³ S·cm⁻¹ at 80 °C and 100% RH.
• Im@LCUH-103 achieves a significantly enhanced proton conductivity of 3.18 × 10⁻² S·cm⁻¹.
• Pd@LCUH-103 demonstrates high catalytic efficiency for nitrophenol reduction with a rate constant of 1.34 min⁻¹ and exceptional cycling stability.

Conclusions:

• The synthesized cobalt-based MOF, LCUH-103, is a highly stable material with promising proton conductivity.
• Imidazole encapsulation effectively boosts proton conductivity, making Im@LCUH-103 a superior material for energy applications.
• Pd@LCUH-103 shows excellent catalytic performance and stability, outperforming Pd/C catalysts in nitrophenol reduction.