Hydrogenated Silicon Hydrogen Release via Alkaline Reaction
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Solution Overview
Problem
The production and storage of dihydrogen for fuel cells are hindered by inefficient liquefaction processes, safety concerns with pressurized vessels, and the need for intermediate compounds that are toxic or have low dihydrogen production capacity.
Innovation Solution
A method involving the electrochemical treatment of a silicon substrate with an acid to create hydrogenated silicon, which is then brought into contact with an alkaline solution to generate dihydrogen in a single step, allowing for on-demand production without storage or restitution steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dihydrogen is stored in cryogenic tanks, then storage capacity is improved, but the yield of dihydrogen liquefaction process deteriorates
Solution Approach 1:
The invention changes the state of hydrogen from gaseous storage to solid-state storage in the form of silicon hydride. This phase transition eliminates the need for energy-intensive liquefaction processes while maintaining high storage capacity, directly resolving the contradiction between storage capacity and energy loss.
2Quantity of substance
If dihydrogen is stored in pressurized vessels, then storage capacity is improved, but safety problems worsen
Solution Approach 1:
The invention transforms hydrogen from a high-pressure gas into a solid compound (silicon hydride) where hydrogen is chemically bound. This eliminates the safety hazards associated with high-pressure storage while maintaining storage capacity, as the hydrogen is released only through controlled chemical reaction rather than pressure release.
3Ease of operation
If intermediate fuels like methanol are used to generate dihydrogen, then ease of operation is improved, but performance and toxicity worsen due to carbon dioxide release
Solution Approach 1:
The invention extracts hydrogen directly from silicon hydride through reaction with water, eliminating the need for intermediate fuel combustion. This removes the harmful byproducts (carbon dioxide and toxic emissions) associated with methanol-based systems while maintaining ease of operation, as the water-silicon hydride reaction produces only hydrogen and silicon hydroxide.
4Quantity of substance
If solid metal hydrides or carbon nanotubes are used to store dihydrogen, then storage capacity is improved, but energy consumption worsens due to the need to supply energy for desorption
Solution Approach 1:
The invention converts the stable silicon-hydrogen bonds, which would normally require energy to break, into a beneficial system where water naturally reacts with silicon hydride to release hydrogen. The reaction with water is exothermic or low-energy, transforming what could be an energy-consuming desorption process into an energy-efficient or energy-neutral hydrogen release mechanism.
5Temperature
If sodium borohydride decomposition is used to generate dihydrogen, then operation at room temperature is improved, but device complexity worsens due to the need for a catalyst
Solution Approach 1:
The invention uses silicon hydride that reacts directly with water without requiring external catalysts. The silicon-hydrogen bonds are sufficiently reactive with water to proceed at room temperature autonomously, eliminating the need for catalytic materials and simplifying the device architecture while maintaining favorable operating temperature conditions.
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
This method enables efficient, on-demand dihydrogen production with a higher capacity and lower production costs compared to existing methods, as it regenerates silicon-hydrogen bonds for repeated use, eliminating the need for storage and intermediate compounds.
Implementation Method 1
The alkaline solution reacts on the silicon-hydrogen layer thus releasing dihydrogen while forming a new layer of silicon-hydrogen on the surface of the silicon substrate
Implementation Method 2
The hydrogenated silicon used is obtained by electrochemical treatment of a silicon substrate with an acid
Data Source
Figure 1
AI summary
The invention relates to a method for producing dihydrogen from hydrogenated silicon, that comprises contacting the hydrogenated silicon with an alkaline solution. The invention also relates to devices of the fuel cell type using this hydrogen production method.