Hydrogen Bond Network Shaping Proton Penetration Behavior across Two-Dimensional Nanoporous Materials.

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Proton transport through nanoporous materials is critical for energy applications.
• Understanding the factors influencing proton penetration barriers is essential for designing efficient membranes.
• Two-dimensional (2D) nanoporous materials offer unique properties for ion transport.

Purpose of the Study:

• To investigate aqueous proton penetration behavior across different 2D nanoporous materials.
• To elucidate the role of hydrogen bonding in proton transport.
• To identify key factors for optimizing proton penetration in 2D nanomaterials.

Main Methods:

• Extensive ReaxFF molecular dynamics simulations were employed.
• Four types of 2D nanoporous materials with similar pore sizes were studied.
• Analysis focused on the hydrogen bond (HB) network formed between materials and water.

Main Results:

• Significant differences in proton penetration energy barriers were observed despite similar pore sizes.
• The strength and type of the hydrogen bond network dictate proton transport.
• Strong surface HB networks create dense water layers that trap protons.

Conclusions:

• Proton penetration is governed by the hydrogen bond network, not solely pore size.
• A weak HB network between the 2D material and water facilitates proton transport.
• Optimizing proton transport requires careful consideration of interfacial interactions and pore structure.