Local descriptors-based machine learning model refined by cluster analysis for accurately predicting adsorption energies on bimetallic alloys

Abstract

Exploring the vast chemical compound space to provide activity-site relationships on bimetallic catalysts presents significant challenges. It also raises the necessity of developing methodologies capable of overcoming the cost of the computational screening of high-performing heterogeneous catalysts. In the present contribution, we introduce machine learning models enhanced by local descriptors related to the adsorption site for predicting adsorption energies. Additionally, we combined them with cluster analysis to bring valuable tools to detect anomalies in the database, thus enhancing the accuracy and robustness of the predictive models. This approach accurately predicts the adsorption energies of several species containing C, N, S, O, and atomic H adsorbed on AB-type bimetallic alloys with stoichiometric variation of A : B ratios. Among all the evaluated ML-based architectures, the CatBoost model exhibits the best performance with a MAE of 0.019 eV and 0.174 eV for the training and test sets, respectively. The cluster analysis highlights the importance of constructing descriptors containing physicochemical-intuitive insight for describing the bonding interactions. This methodology facilitates the recognition of electronic-structural trends of the surrounding local active site, thereby becoming a potential tool to screen adsorption energies and, ultimately, the catalytic activity.