Photochemical transformation of UiO-66-NH2 during hydrogen generation under solar irradiation
Lorena Gudiño, Manuel Peñas‐Garzón, Juan J. Rodrı́guez, Jorge Bedia, Carolina Belver
Abstract
This work reports for the first time the photochemical transformation suffered by the UiO-66-NH2 MOF during hydrogen production under solar irradiation using different scavengers. Triethanolamine caused the complete dissolution of the MOF, while Na2S/Na2SO3 transformed the UiO-66-NH2 into a novel Zr-based material characterized by an amorphous structure with a production rate of 0.439 μmol H2·gcat−1·h−1. The MOF-derived material maintained its performance during long-term on-stream experiments thanks to the electron transfer from the sulfide/sulfite ions to the valence band of the photocatalyst. However, significant doubts about the stability of UiO-66NH2 and other MOFs in the photocatalytic generation of hydrogen are arisen.