In this Phase I Small Business Innovation Research (SBIR) project, Giner, Inc. (Giner), in partnership with City College of New York (CCNY), will synthesize highly selective nanostructured copper catalysts, which can help convert carbon dioxide (CO2) to methane at high-faradaic efficiency. The electrocatalyst will be integrated into membrane and electrode assemblies that will be evaluated in an electrolyzer platform. The project will focus on integrating the advanced CO2 reduction catalysts developed at CCNY into Giner’s state-of-the-art electrolyzer, which harnesses surplus renewable energy to convert CO2 to valuable hydrocarbon fuels. Giner will further develop the CO2 reduction catalysts for electrochemical reduction of CO2 to hydrocarbon fuels; construct flow electrolyzer cells by integrating CO2 reduction catalysts with other components; optimize operating conditions of electrolyzer cells to maximize the efficiency, selectivity, and yield of hydrocarbon fuels; and perform the economic analysis of flow electrolyzer cells under the scenario of utilizing a renewable energy cell.