Hydrogen Release from Borane-Borohydride Mixtures
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Solution Overview
Problem
Current hydrogen storage methods for fuel cell vehicles face challenges such as high costs, bulkiness, and safety concerns due to high-pressure compression and cryogenic liquefaction, and solid state hydrogen storage materials have low capacity at moderate temperatures and pressures, making them unsuitable for onboard storage.
Innovation Solution
A method involving a mixture of nitrogen-containing borane compounds and active metal borohydrides, such as ammonia borane and sodium borohydride, is used with water vapor and moderate heat to release hydrogen through hydrothermolysis, eliminating the need for catalysts and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-pressure compression is used for hydrogen storage, then hydrogen storage capacity is improved, but system cost and safety risks increase
Solution Approach 1:
The patent changes the storage parameter from high-pressure gas phase to moderate-temperature solid-state chemical hydride phase, achieving high density storage at safe pressures while maintaining rapid release capability through catalytic decomposition
Solution Approach 2:
The patent utilizes phase transition of hydrogen from gas storage to solid-state chemical bonding in metal hydrides, enabling compact storage that can be reversibly converted back to gas phase for fuel cell application
2Quantity of substance
If cryogenic liquefaction is used for hydrogen storage, then hydrogen storage capacity is improved, but energy consumption increases
Solution Approach 1:
The patent changes the storage parameter from cryogenic liquid phase to moderate-temperature solid-state chemical hydride phase, eliminating the need for continuous cooling while maintaining high storage density through chemical bonding
Solution Approach 2:
The patent converts the typically harmful strong metal-hydrogen bonding into a beneficial feature by selecting metal hydrides with appropriate bond strengths that enable both high storage capacity and facile reversible release at moderate temperatures
3Object-affected harmful factors
If traditional solid state hydrogen storage materials are used, then safety is improved, but storage capacity at moderate temperatures and pressures decreases
Solution Approach 1:
The patent employs composite material systems combining metal hydrides with catalytic components and support structures, achieving both high storage capacity through the metal hydride phase and rapid release kinetics through the catalytic phase at moderate temperatures
Solution Approach 2:
The patent segments the storage system into distinct functional components: the metal hydride phase for high-capacity storage, catalytic phases for rapid release, and support structures for thermal management, allowing each component to optimize its specific 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
This method achieves high gravimetric hydrogen release capacity, fast kinetics, and modest operation and hardware requirements, making it suitable for fuel cell applications and improving hydrogen storage efficiency by avoiding the limitations of traditional methods.
Implementation Method 1
A method involving a mixture of nitrogen-containing borane compounds and active metal borohydrides, such as ammonia borane and sodium borohydride, is used with water vapor and moderate heat to release hydrogen through hydrothermolysis
Data Source
AI summary
A method for generating hydrogen from a mixture of nitrogen containing borane compound and active metal borohydride reactants uses a catalyst-free water vapor driven hydrothermolysis process. The method involves mechanically mixing a selected ratio of nitrogen containing borane compound such as ammonia borane and an active metal borohydride such as sodium borohydride to produce a mixture, combining the mixture with a water vapor source, and heating the mixture and water vapor source to a temperature within a near ambient temperature range of 30° C. to 104° C., until a product gas comprising hydrogen is released. The heating can be at a constant temperature or at increasing temperatures. Water vapor and impurities are removed from the product gas to produce purified hydrogen gas.