햇빛을 이용한 이산화탄소 전환
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박현웅 교수 경북대학교 Artificial photosynthesis of value-added chemicals from CO2 and water has received renewed attention, and diverse technical solutions for high-efficiency and durable systems have been explored. Photocatalytic (PC) and photoelectrochemical (PEC) systems have long been demonstrated to be technically viable with a number of semiconductor photoanodes coupled to metal or metal oxide electrodes and photocathodes coupled to metal/metal oxide anodes. Although they are promising, however, these single absorbers (photoanode or photocathode) exhibit significantly lower efficiencies than the solar conversion limit and require external biases, primarily because of energy losses arising from overpotentials in the O2-evolution and CO2-reduction reactions. Recently, photovoltaic-assisted electrocatalytic (PV-EC) systems are considered alternatives to the conventional PEC systems while reporting significantly higher efficiencies than the PEC. In this study, we will show three types of photosystems (PC, PEC, and PV-EC) with various metals and metal oxides electrodes synthesized in our group, and compare the systems in terms of solar-to-chemical conversion efficiency and durability. Finally, possible applications of the synthesized materials will be presented. |