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A Robust Photocatalytic Hybrid Material Composed of Metal‐Organic Cages and TiO 2 for Efficient Visible‐Light‐Driven Hydrogen Evolution
Author(s) -
Qin Su,
Lei Yang,
Huang JianFeng,
Xiao LiMin,
Liu JunMin
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202100469
Subject(s) - photocatalysis , catalysis , materials science , mesoporous material , homogeneous , metal , visible spectrum , degradation (telecommunications) , pyridine , hydrogen production , chemical engineering , nanotechnology , chemistry , optoelectronics , organic chemistry , computer science , physics , metallurgy , engineering , telecommunications , thermodynamics
The design of photochemical molecular devices (PMDs) for photocatalytic H 2 production from water is a meaningful but challenging subject currently. Herein, a Pd 2 L 4 type metal‐organic cage (denoted as MOC‐Q2) is designed as a PMD, which consists of two catalytic centers (Pd 2+ ) and four photosensitive ligands (L‐2) with four pyridine anchoring groups. Subsequently, the MOC‐Q2 is combined with TiO 2 to form TiO 2 ‐MOC‐Q2 hybrid materials with different MOC‐Q2 contents by a facile sol‐gel method, which have micro/mesoporous structures and large surface areas. The optimized TiO 2 ‐MOC‐Q2 (6.5 wt%) exhibits high H 2 production activity (7.9 mmol g −1 h −1 within 5 h) and excellent durability, giving a TON value of 23477 or 11739 (based on MOC‐Q2 or Pd moles) after recycling for 7 rounds. By contrast, the pure MOC‐Q2 only shows an ordinary photocatalytic H 2 production rate (0.84 mmol g −1 h −1 within 5 h) in the homogeneous system. It can be deduced that TiO 2 drives the photocatalysis and simultaneously acts as the structure promoter. This study presents a meaningful and distinctive attempt of a new approach for the design and development of MOC‐based heterogeneous photocatalysts.