Advances in the field of goal-directed molecular optimization offer the promise to find feasible candidates for even the most challenging molecular design applications with a vast potential search space. As an example of a fundamental design challenge with industrial relevance, we search for novel stable open-shell molecular scaffolds for an aqueous redox flow battery that simultaneously satisfy redox requirements at the anode and cathode. To meet this challenge, we develop a new open-source molecular optimization framework, RLMolecule. This is based on AlphaZero coupled with a fast, ML-derived surrogate objective trained with nearly 100,000 quantum chemistry simulations. The objective function comprises two graph neural networks: one that predicts adiabatic oxidation and reduction potentials and a second that predicts electron density and local 3D environment, previously shown to be correlated with radical persistence and stability. With no hand-coded knowledge of organic chemistry, the reinforcement learning agent finds molecule candidates that satisfy a precise combination of redox, stability, and synthesizability requirements defined at the quantum chemistry level, many of which have reasonable predicted retrosynthetic pathways. The optimized molecules show that alternative stable radical scaffolds may offer a unique profile of stability and redox potentials to enable low-cost symmetric aqueous redox flow batteries.

Multi-objective goal-directed molecule optimization with an open-source reinforcement learning framework

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.