In light of the aforementioned challenges, achieving the construction of an effective f-EPC reactor remains a pivotal yet unfulfilled objective. Recently, the Atobe group made strides in this domain, introducing a prototype of a flow cell for synthetic electrophotocatalysis. While it introduced valuable insights and advancements, there were aspects regarding robustness and productivity that requires further refinement and exploration (13). The desired reactor would ideally be i) modular and robust, ii) comprised of interchangeable, solvent-resistant materials, iii) safe and user-friendly, and iv) versatile, facilitating either independent or simultaneous execution of photochemistry and electrochemistry. Based on our experience, we posit that the challenges intrinsic to photochemistry and electrochemistry can be concurrently addressed through reaction miniaturization. Given the short-lived nature of the generated reactive species, it is plausible to suggest that all pertinent processes will occur in close proximity to the electrodes. Consequently, efficient photon delivery near the electrode surface becomes crucial.