Tungsten Oxide Photocatalyst with Titanium Shell for Alkali Resistance
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Solution Overview
Problem
Conventional tungsten oxide-based photocatalyst materials lack alkali resistance, leading to degradation and reduced photocatalytic activity when exposed to basic gases or cleaning agents, limiting their applications.
Innovation Solution
A tungsten oxide-based photocatalyst material is developed with a full surface coverage of a titanium oxide shell layer, enhancing alkali resistance and maintaining high photocatalytic activity, where the shell layer is preferably crystalline and the weight proportion of titanium oxide to tungsten oxide is between 0.01 and 1.0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a tungsten oxide based photocatalyst material is used to achieve visible light absorption, then photocatalytic activity under visible light is improved, but alkali resistance deteriorates causing dissolution and quality degradation
Solution Approach 1:
The invention creates a composite photocatalyst material consisting of tungsten oxide particles coated with a titanium oxide shell layer. The tungsten oxide core provides visible light absorption capability while the titanium oxide shell provides alkali resistance, combining the advantages of both materials to resolve the contradiction between visible light responsiveness and alkali stability
Solution Approach 2:
The invention applies a thin shell layer of titanium oxide (with weight proportion between 0.01 and 1.0 relative to tungsten oxide) on the surface of tungsten oxide particles. This thin film approach provides sufficient alkali resistance protection while minimizing the thickness to maintain photocatalytic activity, effectively balancing protection and functionality
2Reliability
If a titanium oxide shell layer is applied to protect against alkali, then alkali resistance is improved, but photocatalytic activity may be reduced due to coverage of active sites
Solution Approach 1:
The invention carefully controls the thickness of the titanium oxide shell layer by specifying the weight proportion (0.01 to 1.0) relative to the tungsten oxide core. This thin film design provides necessary alkali resistance while leaving sufficient photocatalytic sites exposed to maintain high photocatalytic activity
Solution Approach 2:
The invention optimizes the weight proportion parameter of titanium oxide to tungsten oxide within the range of 0.01 to 1.0 to achieve the best balance between alkali resistance and photocatalytic activity. This parameter control ensures the shell is thick enough for protection but thin enough to preserve catalytic function
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
The material achieves significant alkali resistance and maintains high photocatalytic activity, with an alkali resistance of 50% or greater and a gas decomposition rate ratio of 50% or greater, effectively addressing the limitations of conventional tungsten oxide photocatalysts.
Implementation Method 1
a shell layer with which a whole surface of the core particle is covered, the core particle being constituted by at least a tungsten oxide, and the shell layer being constituted by at least a titanium oxide
Implementation Method 2
a tungsten oxide has a smaller bandgap compared with a titanium oxide and can therefore absorb visible light
Data Source
AI summary
A photocatalyst material (1A) in accordance with an aspect of the present invention includes a core particle (2) and a shell layer (3) with which a whole surface of the core particle (2) is covered. The core particle (2) contains at least a tungsten oxide, and the shell layer (3) is constituted by a titanium oxide.