About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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AI/Data Informatics: Applications and Uncertainty Quantification at Atomistics and Mesoscales
|
Presentation Title |
Predicting Adsorption Energies and Surface Pourbaix Diagram of Metal NPs by GCNN Method |
Author(s) |
Kihoon Bang, Youngtae Park, Donghun Kim, Sang Soo Han, Hyuck Mo Lee |
On-Site Speaker (Planned) |
Hyuck Mo Lee |
Abstract Scope |
A surface Pourbaix diagram is useful in investigating stability of materials, especially, for catalysts. However, to build it, numerous DFT calculations are needed to obtain adsorption energies and their computational costs are quite high for nanoparticles (NPs) with a large number of atoms. To overcome it, we used a graph based convolutional neural network (GCNN) model to predict adsorption energies of adsorbates on NPs and build the surface Pourbaix diagram of NPs from predicted values. By our GCNN model, we could predict adsorption energies on Pt NPs with a reasonable accuracy for not only a single adsorbate but also multiple adsorptions. Then, we constructed a surface Pourbaix diagram of Pt NPs from predicted adsorption energies by our model and it is similar to the diagram by DFT calculated values. We also predicted adsorption energies on large NPs, which are not used for training, and build their surface Pourbaix diagram. |
Proceedings Inclusion? |
Planned: |