Linear Conjugated Polymer–Semiconductor Composite for Hydrogen Production
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Solution Overview
Problem
Existing inorganic photocatalysts are inefficient in utilizing visible light and prone to photo-corrosion, while linear conjugated polymer materials agglomerate at high concentrations, compromising hydrogen production efficiency.
Innovation Solution
A composite material comprising inorganic semiconductor particles with a linear conjugated polymer material on their surface, where the energy level difference is within 2 eV, reducing agglomeration and facilitating electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic photocatalysts are used, then hydrogen production can be achieved, but the energy gap is too large allowing only ultraviolet light utilization while visible light is underutilized
Solution Approach 1:
The patent combines linear conjugated polymer materials with inorganic semiconductor particles to create a composite photocatalyst. The polymer component absorbs visible light effectively while the inorganic semiconductor provides catalytic activity, resolving the contradiction between visible light utilization and hydrogen production efficiency
Solution Approach 2:
The patent modifies the energy band structure parameters of the photocatalyst system by combining materials with complementary band gaps. The linear conjugated polymer's HOMO-LUMO energy levels are matched with the inorganic semiconductor's conduction and valence bands to enable visible light absorption and efficient charge separation
2Use of energy by moving object
If linear conjugated polymer materials are used at high concentration, then visible light absorption is improved, but agglomeration occurs compromising efficiency
Solution Approach 1:
The patent disperses linear conjugated polymer materials onto individual inorganic semiconductor particle surfaces, preventing agglomeration. Each polymer-coated particle acts as a separate unit that absorbs visible light effectively while maintaining stable dispersion in the reaction medium
Solution Approach 2:
The inorganic semiconductor particles serve as intermediaries that prevent direct polymer-polymer interactions. The polymer materials are compounded on the particle surfaces, using the inorganic particles as spacers that maintain dispersion stability while enabling visible light absorption
3Productivity
If inorganic photocatalysts are used, then hydrogen production is achieved, but photo-corrosion decreases lifespan
Solution Approach 1:
The patent creates a composite structure where linear conjugated polymer materials are compounded on inorganic semiconductor particle surfaces. This composite structure protects the inorganic semiconductor from photo-corrosion while maintaining hydrogen production capability, extending catalyst lifespan
Solution Approach 2:
The patent converts the potential harm of photo-corrosion into a beneficial protective effect. The linear conjugated polymer layer acts as a protective coating that prevents direct exposure of the inorganic semiconductor to corrosive conditions, transforming the vulnerability into a protective mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances photocatalytic hydrogen production efficiency by prolonging photo-excited electron survival time and avoiding rapid recombination, with improved dispersion and reduced agglomeration.
Implementation Method 1
Because of the adjustable structures of linear conjugated polymers, visible light may be absorbed by adjusting the structures of linear conjugated polymers
Implementation Method 2
a photo-excited electron may move from the LUMO of the linear conjugated polymer material to the conduction band of the material of the inorganic semiconductor particles after the carrier of the linear conjugated polymer material is separated through light excitation
Implementation Method 3
a photo-excited electron may move from the LUMO of the linear conjugated polymer material to the conduction band of the material of the inorganic semiconductor particles
Implementation Method 4
after the carrier of the linear conjugated polymer material is separated through light excitation
Data Source
AI summary
A composite material for photocatalytic hydrogen production and a photocatalytic hydrogen production catalyst are provided. The composite material includes a plurality of inorganic semiconductor particles and a linear conjugated polymer material. The conductive band of a material of the inorganic semiconductor particles is higher than the reduction potential of hydrogen, and the linear conjugated polymer material is compounded on a surface of each of the inorganic semiconductor particles, wherein the difference in the energy level of the lowest unoccupied molecular orbital (LUMO) of the linear conjugated polymer material and the conductive band of the material of the inorganic semiconductor particles is within 2 eV.