This MSCA Postdoctoral Fellowship, SOLAR-CAT ID:101064765, aimed to develop nanoparticles for CO2 (or H+) reduction coupled with alcohol oxidation using sunlight as the primary energy source. The project sought to develop efficient, noble-metal-free dye-sensitized photocatalysts (DSPs) that can drive sustainable chemical transformations, reducing reliance on fossil fuels and contributing to carbon neutrality. The urgency of the global transition to renewable energy sources, combined with the need for low-cost, scalable, and efficient photocatalysts, served as the driving context behind SOLAR-CAT. The project aimed to enhance the sustainability of industrial processes by providing a viable solution for producing green fuels and valuable chemicals directly from sunlight. SOLAR-CAT contributes to the broader EU goals of decarbonization, climate change mitigation, and energy independence, supporting the European Green Deal and the Horizon Europe agenda. The pathway to impact includes developing systems that could be adapted for large-scale deployment in the energy, chemical, and environmental sectors. By focusing on DSPs, the project aligns with EU efforts to reduce dependency on critical raw materials such as platinum and palladium, promoting materials security. The results are expected to impact energy production and environmental sustainability on a global scale.