Metal-Semiconductor Nano-Hetero Structure for Solar Hydrogen Generation
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Solution Overview
Problem
Current technologies for converting solar energy into usable forms like hydrogen energy are hindered by high costs and environmental concerns, and there is a need for efficient methods to decompose water using solar radiation to generate hydrogen.
Innovation Solution
A metal/semiconductor nano-hetero structure is fabricated by attaching metal nanoparticles to a nano-semiconductor base, enhancing charge separation efficiency through chemical bonding, allowing for the absorption of solar energy and conversion into chemical, hydrogen, or electrical energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolysis or thermal power methods are used to generate hydrogen, then hydrogen can be produced, but the cost is high and environmental protection is compromised
Solution Approach 1:
The patent changes the fundamental parameter of energy source from conventional thermal or electrical methods to solar energy. By using semiconductor nanoparticles that absorb solar radiation and generate electron-hole pairs, the system transforms light energy directly into chemical energy for hydrogen production, avoiding the environmental harm and high costs associated with conventional electrolysis and thermal power methods
Solution Approach 2:
The patent employs composite material structures combining semiconductor nanoparticles (such as CdS, TiO2, ZnO) with metal nanoparticles (such as Ag, Au, Pt). This composite approach enhances the photocatalytic efficiency by improving charge separation and electron transfer, thereby achieving effective hydrogen generation using solar energy while maintaining environmental friendliness and cost-effectiveness
2Productivity
If metal particles are attached to semiconductor surface, then charge separation efficiency increases, but metal usage and cost increase
Solution Approach 1:
The patent applies local quality by attaching metal nanoparticles only at specific locations on the semiconductor surface where charge separation is most needed. The metal particles are positioned to receive electrons from the semiconductor conduction band, creating localized electron sinks that enhance charge separation efficiency without requiring extensive metal coverage, thereby reducing overall metal usage and cost
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 nano-hetero structure effectively increases the efficiency of solar energy conversion into usable forms, reducing metal usage and costs while improving the stability and longevity of the catalyst, enabling efficient hydrogen generation and energy storage.
Implementation Method 1
metal particles are directly attached to the surface of the semiconductor by chemical bonding
Implementation Method 2
The nano-hetero structure can be used to absorb solar energy and convert light energy into chemical energy, hydrogen energy, or electrical energy
Implementation Method 3
adding a metal ion solution to a solvent containing the nano-semiconductor base such that the metal ions are reduced to grow metal nanoparticles that attach to the surface of the nano-semiconductor base
Data Source
AI summary
A nano-hetero structure is provided. The nano-hetero structure includes at least one nano-semiconductor base and a plurality of metal nanoparticles attached on the surface of nano-semiconductor base.