Construction of planar-type defect-engineered metal–organic frameworks with both mixed-valence sites and copper-ion vacancies for photocatalysis. Issue 46 (14th November 2020)

• Record Type: Journal Article
• Authors: Guo, Yuan; Feng, Chao; Wang, Shixin; Xie, Yuehong; Guo, Changyan; Liu, Ziran; Akram, Naeem; Zhang, Yi; Zhao, Yansong; Wang, Jide
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 46(2020)
• Page Start: 24477
• Page End: 24485
• Publication Date: 2020-11-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta08085c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : This manuscript presents a facile paradigm for controllably developing planar-type defect-engineered metal–organic frameworks (DEMOFs) by systematically doping reductive defect linker vanillin (VAN) during the synthesis of HKUST-1. Abstract : This manuscript presents a facile paradigm for controllably developing planar-type defect-engineered metal–organic frameworks (DEMOFs) by systematically doping reductive defect linker vanillin (VAN) during the synthesis of HKUST-1. The as-prepared DEMOF variants were designed to carry copper-ion vacancies and mixed-valence Cu 1+ /Cu 2+ sites on the {220} and {111} planes of NR-HKUST-1 and {100}, {110} and {111} planes of NS-HKUST-1 via reversible and irreversible growth modes. The photocatalysis results indicate that the mixed-valence Cu 1+ /Cu 2+ sites (with special electronic properties) in planar-type defective HKUST-1 have a greater effect on performance improvement than copper-ion vacancies (with special steric properties). The HOMO–LUMO gap of the Cu 1+ /Cu 2+ unit is significantly reduced to promote the separation of photogenerated electron–hole pairs and overcome the transfer resistance of electron–hole pairs, leading to an outstanding catalytic activity (3784.2 μmol g −1 h −1 ). This strategy of creating mixed-valence sites and vacancies by doping a reductive defect linker can provide a new way to prepare catalysts with higher photocatalytic activity.