In order to combat climate change and lessen our reliance on fossil fuels, it is crucial to convert CO2 through a catalytic process into clean fuels and chemicals. Hydrogen is created from water using renewable energy. For a sustainable future, it is crucial to find methods for converting CO2 into other valuable chemical compounds, which can then be converted back into CO2 using renewable energy sources. Because it has the potential to decrease CO2 by utilising solar energy and biomethane, photocatalytic reduction of CO2 with methane (abbreviated as PRCM) to create synthesis gas (CO and H2) has caught our interest. Gallium oxide was recently shown to be capable of promoting the PRCM when exposed to UV light at room temperature.