그린 수소 생산을 위한 태양열 열화학 싸이클 반응 연구

초록

In the pursuit of sustainable energy solutions, this study explores the pivotal role of ceria (CeO2) in facilitating solar thermo-chemical cycles for green hydrogen production and CO2 reduction. The focal point of the investigation lies in enhancing the oxygen exchange capacity (OEC, Δδ) of ceria, a crucial parameter for its efficacy in solar reactors, through the strategic incorporation of various metal dopants (M = Fe, Ni, and Mn). A comprehensive analysis, involving thermo-gravimetric analysis (TGA) cycling experiments, is employed to discern the influence of different dopants and their respective mole fractions on OEC and H2 productivity. Additionally, the dopants’ solubility and integration behavior within the ceria lattice are scrutinized using scanning electron microscopy (SEM-EDX) and powder X-ray diffraction methodologies. The empirical data is further corroborated with density functional theory (DFT) calculations, establishing a theoretical correlation between Δδ and the partial electronic charge of the metal dopants. This investigation not only provides a deeper understanding of the mechanisms underpinning the enhanced OEC of doped ceria but also offers a foundation for further optimizing ceria-based materials for clean fuel production via solar thermochemical processes.