title: Self-Healing of Molecular Catalyst and Photosensitizer on Metal-Organic Framework: Robust Molecular System for Photocatalytic H2 Evolution from Water.
abstract: Inspired by self-repair mechanism of PSII in plants, we report a self-healing system which spontaneously repairs molecular catalyst and photosensitizer during photocatalytic H2 evolution. A bipyridine-embedded UiO-type metal-organic framework (MOF), namely Ptn_Ir_BUiO, which incorporated H2-evolving catalyst and photosensitizer, was synthesized and subject to photocatalytic H2 evolution reaction (HER). Impressively, HER with Pt0.1_Ir_BUiO showed very stable molecular photocatalysis without significant decrease in its activity and colloidal formation for 6.5 days at least; in the homogeneous counterpart, the molecular catalyst became a colloid just after 7.5 h. It was revealed that the arrangement of diimine sites which closely and densely surrounded the H2-evolving catalyst and photosensitizer in the MOF enabled such a highly efficient self-healing.
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Dongha
authors.initials: D
authors.lastname: Kim
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Dong Ryeol
authors.initials: DR
authors.lastname: Whang
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Park
mesh_terms: D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry*; D007097:Imines / Q000737:chemistry; D000073396:Metal-Organic Frameworks / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D017319:Photosensitizing Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D007097:Imines; D000073396:Metal-Organic Frameworks; D017319:Photosensitizing Agents; D014867:Water; D006859:Hydrogen