Aza-fused conjugated trapezoidal polymer and preparation method thereof, and application of aza-fused conjugated trapezoidal polymer in catalysis of water decomposition under visible light

Abstract

The invention provides an aza-fused conjugated trapezoidal polymer. The aza-fused conjugated trapezoidal polymer is prepared from 1,2,4,5-benzenetetramine tetrahydrochloride and 2,5-dihydroxy-1,4-benzoquinone through a polymerization reaction, or from 1,2,4,5-benzenetetramine tetrahydrochloride and piperazine-2,3,5,6-tetraone through a polymerization reaction, or from 1,2,4,5-benzenetetramine tetrahydrochloride and pyrene-4, 5, 9, 10-tetraone through a polymerization reaction. In the conjugated trapezoidal polymer, a fused ring structure limits free torsional motion between aromatic units along a skeleton, stable and effective conjugation can be provided, and transmission of carriers is facilitated. The conjugated trapezoidal polymer has good absorption performance in a visible light range; the energy band structure of the conjugated trapezoidal polymer meets the requirement of water photolysis for oxygen production under visible light irradiation; the conjugated trapezoidal polymer has excellent oxygen production performance; and the trapezoidal polymer is used for visible light decomposition of water for oxygen production for the first time, and the application scope of the trapezoidal polymer in the field of photocatalysis is greatly broadened.

Description

technical field [0001] The invention relates to the technical field of photolysis of water to produce oxygen, in particular to a class of aza-condensed and conjugated ladder polymers, a preparation method thereof and an application of catalytic water splitting under visible light. Background technique [0002] At present, nearly 80% of the world's energy consumption comes from fossil energy. However, with the increasing energy demand, limited fossil energy reserves and increasingly severe environmental situation, people urgently need to develop a new type of environmentally friendly alternative energy. Solar energy, an inexhaustible energy source, has attracted widespread attention. Among them, the use of semiconductor catalysts to photocatalytically split water is an effective method that can directly convert solar energy into chemical energy, and is a new energy source with great development potential. technology. [0003] The photocatalytic total water splitting reaction...

AI Technical Summary

Problems solved by technology

"Journal of the American Chemical Society" (Journal of the American Chemical Society, 2015, Vol. 137, page 15338) reported that a ladder polymer BBL (polyphenanthroline ladder polymer) was used as a photoanode for photoelectric water splitting, The BBL photoanode shows good photoelectrochemical stability after 3 hours of water oxidation reaction, and there is no obvious degradation phenomenon. Although the material meets the conditions of oxidizing water to produce oxygen in thermodynamics, its oxidation product is actually hydrogen peroxide. Based on the BBL material, the composite layered titanium dioxide acts as an electron channel and supports a nickel-cobalt catalyst to decompose water to generate oxygen. The yield is very low, 20nmol / h

This method is complex in operation, low in performance, and due to the need for external voltage, the introduction of metals and other operations greatly increases the cost, which is not conducive to the application of photocatalytic industry

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