ZnO Nanoparçacıklarının Yenilenebilir Enerjideki Uygulamaları: Bir Yaşam Döngüsü Değerlendirmesi Yaklaşımı

Abstract

This study presents a detailed Life Cycle Assessment (LCA) of nano Zinc Oxide (ZnO) used in solar energy systems, focusing on its environmental impacts throughout its life cycle, from production to disposal. Nano ZnO is increasingly integrated into photovoltaic systems to improve efficiency and performance. However, its introduction raises specific environmental challenges. The analysis encompasses the various stages of nano ZnO’s life cycle, including raw material extraction, manufacturing, application in solar panels, and end-of-life management, employing Life Cycle Assessment (LCA) methodologies to quantify energy consumption, resource depletion, and emissions. The results from the literature review showed that while nano ZnO is the active material in various innovative solar cell technologies, including Quantum-Dot Sensitized Solar Cells, Dye-Sensitized Solar Cells, Perovskite-Sensitized Solar Cells, Organic Solar Cells, Inorganic Solar Cells, and Hybrid Solar Cells, its production does bring about certain environmental issues, including increased energy consumption. It can be said that the synthesis of nano ZnO is the key step that affects its LCA results. Among various synthesis approaches, such as sol-gel, hydrothermal, solvothermal, controlled precipitation, aerosol pyrolysis, and mechanochemical methods, the LCA results indicate significant variations in their environmental impacts. Certain techniques, such as mechanochemical milling, solvothermal synthesis, and aerosol pyrolysis, tend to have higher environmental burdens due to their reliance on toxic solvents, extreme energy demands (e.g., high-temperature calcination and ball milling), and the production of hazardous by-products. Conversely, other approaches, including hydrothermal synthesis, controlled precipitation, and aqueous-based sol-gel processes, demonstrate lower environmental footprints, benefiting from water-based solvents, reduced processing temperatures, biodegradable stabilizing agents, and minimal waste generation. In particular, the integration of more sustainable synthesis methods may help mitigate some of the adverse environmental impacts associated with nano ZnO production, ensuring that its role in the development of solar energy technologies remains environmentally viable. These results highlight the critical need to optimize synthetic routes to comply with green chemistry principles, thereby enhancing the sustainability of nano-enabled solar technologies.