The study explores the modulation of phase transition in MoOx through proton intercalation driven by an electric field. By controlling the proton flux, stable memory operations and improved electric-to-chemical energy conversion are achieved. At a specific proton flux, conductivity increases significantly, enabling stable memory operation with a five-order magnitude change. Higher proton flux triggers energy conversion, enhancing the reaction rate. The research provides insights into the optimal stoichiometric ratio and proton flux for efficient memory operation. This integration of memory and energy conversion functionalities in a single semiconductor presents opportunities for novel device applications in various fields.