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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Fused-Ring Acceptor-π-Acceptor Architecture Enables Near-Infrared-Absorbing Mesoporous Covalent Organic Frameworks
Zhiwei Zhao1, Ran Sun2, Yang Wang1
1State Key Laboratory of Molecular Engineering of Polymers, College of Smart Materials and Future Energy, Fudan University, Shanghai, China.
None:
Covalent organic frameworks (COFs) featuring donor-acceptor architectures have shown great promise as photocatalysts. However, their performance is often hindered by limitations such as narrow absorbance ranges and restricted electron delocalization, which are inherent to traditional imine linkages. Herein, we introduce a fused-ring acceptor-π-acceptor (FRA-π-A) architecture for near-infrared-absorbing COFs, enabled via in situ COF-to-COF transformation that replaces imine linkages with FRA-derived benzodithiazoles (or benzodioxazoles). Comprehensive structural characterizations confirm their mesoporous crystalline structure, featuring pore size distribution of 2.16-2.39 nm and broad light absorption extending to near-infrared region. Property investigations demonstrate that the rigid backbones derived from the FRA-π-A architecture significantly enhance long-range in-plane electron delocalization, thereby improving the separation and transport of photogenerated charge carriers. Crucially, the accelerated carrier migration preferentially directs photogenerated electrons to the FRAs, promoting the formation of •O2 - radicals and accelerating the rate-limiting step of the oxygen reduction reaction. These synergistic structural and optoelectronic properties endow the FRA-π-A COFs with an outstanding photocatalytic H2O2 production rate of 6.8 mmol g- 1 h- 1 without sacrificial agents, exceeding the vast majority of conjugated linkage-based COFs. This study highlights the immense potential of FRA-π-A COFs as high-performance photocatalysts.
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