Related Experiment Video
Updated: Sep 22, 2025
Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
Complete surface reconstruction of nanoporous gold during CH4 pyrolysis
Xingang Hou1, Kai Wang1, Mengke Ge1
1Center for Electron Microscopy and Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China. weiandna1234@163.com.
Researchers developed a method to control crystal facets on nanoporous gold (NPG) using methane pyrolysis. This breakthrough clarifies surface reconstruction mechanisms for porous materials and catalytic applications.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Nanoporous metals (NPMs) offer high surface area and catalytic activity but controlling their exposed crystal facets is challenging.
- Tuning crystal facets is key to optimizing the performance of metallic nanocatalysts.
Purpose of the Study:
- To develop a method for large-area regulation of exposed crystal facets on nanoporous gold (NPG).
- To elucidate the surface reconstruction mechanism of NPMs during methane pyrolysis.
Main Methods:
- Preparation of NPG with regular surfaces exposing Au {111} and {100} facets via methane pyrolysis.
- High-spatial and -temporal resolution in situ experiments.
- Theoretical calculations.
Main Results:
- Successfully prepared NPG with controlled {111} and {100} facets.
- Identified that carbon species weaken surface Au atom interactions, driving atom migration and recombination.
- Demonstrated a fundamental understanding of porous material reconstruction during methane pyrolysis.
Conclusions:
- Methane pyrolysis enables targeted control of exposed crystal facets on NPG.
- The study provides a theoretical foundation for designing NPMs with specific catalytic properties.
