V2C@V2O5/TiO2 Composite Photocatalyst for CO2 Reduction Selectivity
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Solution Overview
Problem
Current photocatalysts for CO2 conversion suffer from low efficiency, poor selectivity, high recombination rates of photoinduced electron-hole pairs, large band gaps, limited light absorption, and instability, leading to high operational costs and complexity.
Innovation Solution
A composite photocatalyst comprising V2C@V2O5/TiO2, prepared by grinding and calcining a V2C/TiO2 composite, which enhances photocatalytic activity and stability through a synergistic effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional photocatalysts like TiO2 are used, then they are stable and easy to manufacture, but they have large band gaps, limited light absorption, and low photocatalytic efficiency
Solution Approach 1:
The patent creates a composite photocatalyst system consisting of V2C MXene, V2O5 nanocrystals, and TiO2 support. The V2C provides excellent light absorption across UV and visible regions, V2O5 contributes high photocatalytic activity with appropriate band structure, and TiO2 offers stability. This composite structure combines the advantages of each material to achieve high efficiency while maintaining stability and expanding light absorption range.
Solution Approach 2:
The patent applies local quality by creating a hierarchical structure where V2O5 nanocrystals are specifically anchored on V2C MXene surfaces at optimal locations. This localized arrangement ensures that the high-activity V2O5 components are positioned where they can most effectively interact with light and reactants, while the V2C provides the light absorption foundation and TiO2 provides structural stability throughout the composite.
2Productivity
If composite structures and doping strategies are applied to enhance photocatalytic activity, then efficiency improves, but recombination rates of photoinduced electron-hole pairs remain high and selectivity is poor
Solution Approach 1:
The patent uses V2C MXene as an intermediary material between light absorption and catalytic reaction. The V2C layer absorbs light and generates electron-hole pairs, then efficiently transfers electrons to V2O5 nanocrystals where the catalytic reactions occur. This intermediary role of V2C separates the light absorption function from the catalytic function, reducing recombination rates and improving both efficiency and selectivity for CO2 conversion.
3Productivity
If existing catalysts are used for CO2 reduction, then some photocatalytic activity is achieved, but they exhibit instability or deactivation over time, necessitating frequent regeneration or replacement
Solution Approach 1:
The patent optimizes the composition parameters of the composite photocatalyst, specifically controlling the ratios of V2C to V2O5 to TiO2, and adjusting the calcination temperature and duration. These parameter changes create a stable composite structure where V2O5 nanocrystals are firmly anchored on V2C surfaces, preventing aggregation and degradation. The optimized composition maintains high catalytic activity while achieving long-term stability without deactivation.
Data Source
AI summary
A composite photocatalyst, comprising V2C@V2O5/TiO2, is disclosed herein. Additionally, a process for producing this composite, particularly V2C@V2O5/TiO2, involves the steps of preparing V2C@V2O5/TiO2 composite; grinding the V2C@V2O5/TiO2 composite; and calcining the ground product to obtain the composite photocatalyst V2C@V2O5/TiO2. Furthermore, the disclosure encompasses utilizing the composite photocatalyst in a CO2 reduction process, wherein the photocatalyst is irradiated in a photoreactor system.