Graphene Oxide as An Efficient Photocatalyst For Photocatalytic Reduction of CO2 Into Solar Fuel

Abstract

Photocatalytic reduction of CO2 into solar fuel such as methane and methanol, is an
attractive approach to simultaneously solve the energy crisis and global warming
problem. Herein, comparative photocatalytic activity of graphene oxide nanosheets have
been investigated for photocatalytic reduction of CO2 into methane and methanol in
continuous gas and liquid phase photoreactor system. The graphene oxide sheets were
prepared according to Tour’s method. The chemical composition and optical properties
was evaluated through XPS and UV-vis spectroscopy. Graphene oxide nanosheets
exhibited maximum amount of 224.87 μmol/g.h methanol and 14.8 μmol/g.h methane in
liquid and gas phase system, respectively. Higher yield of methanol in liquid phase
compared to methane in gaseous system can be attributed to dispersion of graphene oxide sheets in water. Hence, graphene oxide nanosheets are efficient photocatalyst for CO₂ reduction into methanol. Nevertheless, further research is essential to improve the
photostability of graphene oxide sheets for real application of photocatalytic CO₂ reduction.