The use of solar energy can enhance the conversion of carbon dioxide into energy-rich products: Stepping towards artificial photosynthesis (Review)

摘要

The need to cut CO_2 emission into the atmosphere is pushing scientists and technologists to discover and implement new strategies that may be effective for controlling the CO_2 atmospheric level (and its possible effects on climate change). One option is the capture of CO_2 from power plant flue gases or other industrial processes to avoid it entering the atmosphere. The captured CO_2 can be either disposed in natural fields (geological cavities, spent gas or oil wells, coal beads, aquifers; even oceans have been proposed) or used as a source of carbon in synthetic processes. In this paper, we present the options for CO_2 utilization and make an analysis of possible solutions for the conversion of large volumes of CO _2 by either combining it with H2, that must be generated from water, or by directly converting it into fuels by electrolysis in water using solar energy. A CO_2-H_2-based economy may address the issue of reducing the environmental burden of energy production, also saving fossil carbon for future generations. The integration of CO_2 capture and utilization with CO_2 capture and storage would result in a more economically and energetically viable practice of CO_2 capture.