Nanostructured Metal Hydride Coating for Hydrogen Desorption Kinetics
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Solution Overview
Problem
Current solid-state reversible hydrogen storage materials fail to achieve hydrogen storage targets for both volumetric and gravimetric capacity at practical temperatures, pressures, and rates, with metal borohydrides requiring high temperatures for hydrogen desorption and experiencing kinetic limitations and reversibility issues.
Innovation Solution
The use of nanostructured composite metal hydrides with a solid core coated by atomic layer deposition (ALD) to enhance hydrogen absorption and desorption kinetics, where the coating layer is permeable to hydrogen and helps in maintaining the nanostructured morphology and catalyst dispersion, reducing undesirable phase formation and improving reaction pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal borohydrides are used for hydrogen storage, then high hydrogen volumetric and gravimetric capacity is achieved, but high temperatures are required for hydrogen desorption and kinetic limitations occur
Solution Approach 1:
The solid core is divided into nanostructured particles with controlled size and morphology, creating numerous surface sites for hydrogen reaction. This segmentation increases the surface-to-volume ratio, improving hydrogen absorption and desorption kinetics while maintaining high capacity
Solution Approach 2:
The coating layer composition and thickness are precisely controlled to modify the desorption temperature and kinetics. By adjusting coating parameters such as thickness (nanometer scale) and material composition, the hydrogen desorption temperature is optimized to be lower than the uncoated material while maintaining high capacity
2Quantity of substance
If metal borohydrides are used for hydrogen storage, then high hydrogen capacity is achieved, but kinetic limitations and reversibility issues occur
Solution Approach 1:
The coating layer provides localized catalytic sites and modified surface properties that enhance hydrogen sorption kinetics specifically at the particle surfaces, while the bulk nanostructured core maintains high hydrogen capacity. This local modification approach improves overall kinetics without sacrificing capacity
Solution Approach 2:
The invention uses composite structures combining nanostructured metal borohydride core with functional coating layers. This composite approach integrates the high hydrogen capacity of the metal borohydride with the enhanced kinetics and stability provided by the coating, achieving both high capacity and fast sorption rates
3Productivity
If coating layer is applied to solid core, then hydrogen absorption and desorption kinetics are enhanced, but coating layer thickness must be controlled to maintain hydrogen permeability
Solution Approach 1:
The coating layer thickness is precisely controlled at the nanometer scale to optimize the balance between kinetic enhancement and hydrogen permeability. By adjusting this critical parameter, the coating provides sufficient catalytic activity while remaining transparent to hydrogen diffusion
Solution Approach 2:
The coating layer is designed with porous or defective structure that allows hydrogen permeability while providing high surface area for catalytic activity. This porous architecture enables hydrogen to pass through the coating layer efficiently while still benefiting from the kinetic enhancement provided by the coating material
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 approach enables efficient hydrogen storage and release at lower temperatures, with improved kinetics and cycle-life capacity, potentially surpassing existing hydrogen storage targets and addressing kinetic and reversibility limitations in metal borohydride technology.
Implementation Method 1
the coating layer is permeable to hydrogen (H2)
Implementation Method 2
the solid core is capable of reversibly absorbing and desorbing hydrogen
Implementation Method 3
the solid core is capable of reversibly absorbing and desorbing hydrogen
Data Source
AI summary
The present disclosure relates to a composition that includes a solid core having an outer surface and a coating layer, where the coating layer covers at least a portion of the outer surface, the coating layer is permeable to hydrogen (H2), and the solid core is capable of reversibly absorbing and desorbing hydrogen.