Our group recently hypothesized that such generation and transportation of CO2 fluids were a crucial circumstance for the chemical evolution of life . Although it has long been suggested that life originated in deep-sea hydrothermal vent environments , the apparently water-filled condition has posed many significant challenges regarding experimental verification of prebiotic organic synthesis . Beyond warm and moderately pressurized conditions (≥31.1 °C and ≥73.8 bar), CO2 is present as a supercritical fluid, exhibiting a versatile solvent function owing to its intermediate property between liquid and gas. The unique characteristics, coupled with the ease of preparation, has led to the use of supercritical CO2 (hereafter referred to scCO2) in a variety of chemical and industrial processes that are difficult to be operated in a simple aqueous solution .