Metal-organic aerogels based on titanium(IV) for visible-light conducted CO2 photoreduction to alcohols
Ver/
Fecha
2022-12Autor
Angulo Ibáñez, Adrián
Perfecto Irigaray, Maite
Merino García, Iván
Luengo Ibarra, Naia
Goitandia, Amaia M.
Albo, Jonathan
Aranzabe Basterrechea, Estíbaliz
Metadatos
Mostrar el registro completo del ítem
Materials Today Energy 30 : (2022) // Article ID 101178
Resumen
Metal-organic frameworks (MOFs) imply an appealing source of photocatalysts as they combine porosity with tailorable electronic properties and surface chemistry. Herein, we report a series of unprecedented metal-organic aerogels (MOAs) comprised by Ti(IV) oxo-clusters and aromatic dicarboxylic linkers as an alternative to microporous MIL-125 and MIL-125-NH2 MOFs. Discrete titanium oxo-clusters polymerized upon the addition of the dicarboxylic linkers to give rise to a metal-organic gel. Their supercritical drying led to aerogels comprised by nanoscopic particles (ca. 5-10 nm) cross-linked into a meso/macroporous microstructure with surface area ranging from 453 to 617 m2 center dot g-1, which are comparatively lower than the surface area of the microporous counterparts (1336 and 1145 m2 center dot g-1, respectively). However, the meso/macroporous microstructure of MOAs can provide a more fluent diffusion of reagents and products than the intrinsic porosity of MOFs, whose narrower channels are expected to imply a more sluggish mass transport. In fact, the assessment of the continuous visible-light-driven photocatalytic CO2 reduction into methanol shows that MOAs (221-786 mmol center dot g-1 center dot h-1) far exceed not only the performance of their microporous counterparts (49-65 mmol center dot g-1 center dot h-1) but also surpass the production rates provided by up-to-date reported photocatalysts.