Ionic Liquid-Graphene Sorbent for Faster Thermal Charging
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Solution Overview
Problem
Existing sorbent materials for thermal energy storage suffer from slow heat charging and discharging rates due to poor thermal diffusivity, limiting their commercial potential and practical application.
Innovation Solution
A composite sorbent material is developed by impregnating a few-layer 2D carbon allotrope, such as graphene, with an ionic liquid, which acts as a host structure, enhancing thermal diffusivity and sorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional porous mediums (silica gel, zeolite, graphite) are used as host structures for chemical sorbents, then high surface area and porous volume are achieved, but thermal diffusivity remains insufficient
Solution Approach 1:
The patent combines ionic liquid chemical sorbents with few-layer 2D carbon allotrope physical sorbents to create a composite material that achieves both high surface area and high thermal diffusivity. The 2D carbon structure provides excellent thermal conductivity while the impregnated ionic liquid provides high adsorption capacity, resolving the contradiction between surface area and thermal diffusivity.
Solution Approach 2:
The patent utilizes the porous structure of few-layer 2D carbon allotropes as a host matrix to impregnate ionic liquid sorbents. The porous volume and surface area of the 2D carbon structure enable high sorbent loading while its inherent thermal diffusivity overcomes the thermal conductivity limitation of conventional porous materials like silica gel and zeolite.
2Reliability
If conventional porous mediums are used as host structures, then high adsorption performance is achieved, but heat charging and discharging rates are slow
Solution Approach 1:
The composite structure combines the high adsorption performance of ionic liquids with the high thermal diffusivity of 2D carbon allotropes. This allows the material to maintain excellent adsorption capabilities while achieving fast heat charging and discharging rates, directly resolving the contradiction between reliability and productivity.
Solution Approach 2:
The 2D carbon allotrope acts as an intermediary host matrix that facilitates rapid heat transfer to and from the ionic liquid sorbent. This mediator overcomes the slow heat transfer limitation of conventional porous materials while preserving the high adsorption performance of the ionic liquid.
3Speed
If 3D graphite structures are used, then thermal conductivity is improved, but permeability and physical form are not practical for industrial applications
Solution Approach 1:
The patent transitions from conventional 3D graphite structures to few-layer 2D carbon allotrope structures. This dimensional change maintains high thermal conductivity while improving permeability and creating a more practical physical form for industrial applications. The 2D layered structure allows better fluid penetration while preserving thermal transport properties.
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 composite sorbent material exhibits improved thermal diffusivity and sorption performance, making it suitable for thermal energy storage and other cyclical heating/cooling applications, with potential uses in thermal energy storage, sorption cooling, adsorption water desalination, and air dehumidification.
Implementation Method 1
the heat charging and discharging rates of many sorbent materials can be slow, due to the typical poor thermal diffusivity (i.e., heat transfer rate) of many known sorbent materials
Implementation Method 2
thermal energy is stored in the form of sorption potential, not heat
Data Source
AI summary
A composite sorbent material comprising a few-layer 2D carbon allotrope impregnated with an ionic liquid is described. Also described are a method for producing said material, a composite material comprising said material, and the use of said material for thermal energy storage, sorption cooling, adsorption water desalination or air dehumidification