关键词: 太阳能, 二氧化碳, 熔盐电解, 含能分子

Abstract: This paper introduces the theory，implementation model and application of STEP （solar thermal electrochemical production） which can generate energy molecules. Using solar energy as energy source，the STEP process produces metal，fuel，chlorine，some other energy materials and carbon capture efficiently and orientedly. It provides a new path to convert and store solar energy as chemical energy by synergy and coupling of solar light-heat-electricity utilization efficiency and molecular light-heat-electricity chemical reaction characteristics. The paper points out the breakthrough and application prospect of STEP process in solar chemistry as follows，hydrogen production in molten hydroxides electrolyte，carbon-free iron generation in molten carbonates electrolyte which contains iron compound，chlorine and magnesium generation in molten chlorides electrolyte，carbon capture and carbon-free cement production in molten carbonates electrolyte. STEP process provides an alternative way for realizing the reduction of greenhouse gases emission and comprehensive utilization of carbon dioxide.

Key words: solar energy, carbon dioxide, molten salt electrolysis, energy molecule