Adsorption and Diffusion of Oxygen on Pure and Partially Oxidized Metal Surfaces in Ultrahigh Resolution.
Krishan KanhaiyaHendrik HeinzPublished in: Nano letters (2022)
The interaction of gas molecules with metal and oxide surfaces plays a critical role in corrosion, catalysis, sensing, and heterogeneous materials. However, insights into the dynamics of O 2 from picoseconds to microseconds have remained unavailable to date. We obtained 3D potential energy surfaces for adsorption of O 2 on 11 common pristine and partially oxidized (hkl) surfaces of Ni and Al in picometer resolution and high accuracy of 0.1 kcal/mol, identified binding sites, and surface mobility from 25 to 300 °C. We explain relative oxidation rates and parameters for oxide growth. We employed over 150 000 molecular mechanics and molecular dynamics simulations with the interface force field (IFF) using structural data from X-ray diffraction (XRD) and low-energy electron diffraction (LEED). The methods reach 10 to 50 times higher accuracy than possible before and are suited to analyze gas interactions with metals up to the micrometer scale including defects and irregular nanostructures.
Keyphrases
- molecular dynamics simulations
- biofilm formation
- single molecule
- electron microscopy
- room temperature
- low density lipoprotein
- staphylococcus aureus
- aqueous solution
- escherichia coli
- pseudomonas aeruginosa
- machine learning
- big data
- computed tomography
- artificial intelligence
- climate change
- cystic fibrosis
- ionic liquid
- electron transfer