It is crucial to combat climate change and lessen our reliance on fossil fuels by catalytically converting CO2 into clean fuels and chemicals utilising hydrogen generated from water using renewable energy. It is wanted to decrease CO2 into other usable chemical compounds by employing natural energy and renewable resources, and developing methodologies for CO2 conversion is a crucial effort for our sustainable future. Our attention has been drawn to photocatalytic reduction of CO2 with methane (PRCM), which has the potential to reduce CO2 by utilising solar energy and biomethane to produce synthesis gas (CO and H2). Recently, it was discovered that gallium oxide, when exposed to UV light at room temperature, might enhance the PRCM.