Electrification could be a step toward carbon-neutrality in urban activities, including environmental remediation, resource recovery, and energy storage. By replacing fossil fuels with green and renewable energy, REACT Lab intends to investigate ways to electrify separations and conversions for urban and environmental processes. In particular, we aim to design materials from molecular level and establish electrochemical engineering principles for delicate process-level design, contributing to address challenges in environment, resource recovery from liquid- and gas-phase waste streams, nitrogen/sulfur cycling, water remediation, and energy storage, all enabled by electrified reaction and separation.