Scheme 1 illustrates the electrochemical conversion of bulk black phosphorus (BP) into phosphorus quantum dots (PQDs). To optimize the process, experiments were conducted under various applied potentials and different electrolyte-supporting electrolyte combinations. Based on a yield of approximately 30%, an optimal applied potential of -2.0 V was identified. The BPcoated working electrode was subjected to a cathodic potential of -2.0 V (versus a Ag wire quasireference electrode) in NMP containing 0.1 M LiClO4 for 12 hours. NMP, an organic carbonate electrolyte, is well-suited for lithium-based salts and is commonly used in battery applications. To prevent oxygen dissolution despite using a non-aqueous electrolyte, argon purging was maintained throughout the experiment. For battery applications, the synthesized material is separated from the electrolyte and further used in a coin cell configuration.