A Strategic Approach for Carbon Neutrality by Solar CO ₂ Reduction Into Liquid Fuels

ABSTRACT Achieving carbon neutrality is urgent due to the critical issue of climate change. To reach this goal, the development of new, breakthrough technologies is necessary and urgent. One such technology involves efficient carbon capture and its conversion into useful chemicals or fuels. However, achieving considerable amounts of efficiency in this field is a very challenging task. Even in natural photosynthesis occurring in plant leaves, the CO ₂ conversion efficiency into hydrocarbons cannot exceed a value of 1%. Nevertheless, recently few reports show comparable higher efficiency in CO ₂ to gaseous products such as carbon monoxide (CO), but it is hard to find selective liquid fuel products with a high value of solar to liquid fuel conversion efficiency. Herein, a NiFe‐assisted hybrid composite dark cathode is employed for the selective production of solar‐to‐liquid fuels, in conjunction with a BiVO ₄ photoanode. This process results in the generation of significant amounts of formaldehyde, ethanol, and methanol selectively. The primary objective of this study is to design and optimize a novel photoelectrochemical (PEC) system to produce solar‐to‐liquid fuels selectively. This study shows the enhancement of the solar‐to‐fuel conversion efficiency over 1.5% by employing a hybrid composite cathode composed of NiFe‐assisted reduced graphene oxide (rGO), poly(4‐vinyl)pyridine (PVP), and Nafion.