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Advanced Carbon Aerogels for Energy Applications

Lawrence Livermore National Laboratory

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Technology Marketing Summary

Nanomaterials that are emerging out of cutting edge nanotechnology research are a key component for an energy revolution. Carbon-based nanomaterials are ushering in the “new carbon age” with carbon nanotubes, nanoporous carbons, and graphene nanosheets that will prove necessary to provide sustainable energy applications that lessen our dependence on fossil fuels.

Carbon aerogels (CAs) are nanoporous carbons that comprise a particularly significant class of carbon nanomaterials for a variety of sustainable energy applications.  CAs are specifically promising in that they possess a tunable three-dimensional hierarchical morphology with ultrafine cell size and an electrically conductive framework. They are available as macroscopic, centimeter-sized monolithic materials.

Lawrence Livermore National Laboratory (LLNL) is an international leader in breakthrough carbon aerogel research. Carbon aerogels hold great technological promise for a variety of sustainable energy applications including hydrogen and electrical energy storage, desalination, and electrocatalysis.

Description

Aerogels in general constitute a special class of open-cell foams that exhibit such fascinating properties as low mass density, continuous porosity, and high surface area. The CA microstructure typically consists of three-dimensional networks of interconnected nanometer-sized primary particles.   Sol-gel methods are used to prepare the materials where the liquid in the gel is removed, leaving the solid matrix intact. In essence, the liquid in the gel is replaced with a gas. This transforms the organic aerogel precursor into a porous carbon network comprised of both amorphous and microcrystalline regions.  These materials are mass producible.

As a result, CAs combine the properties of high surface area, electrical conductivity, chemical stability, and environmental compatibility in one material. CAs are specifically promising in that they possess a tunable three-dimensional hierarchical morphology, and that they are available as macroscopic monolithic materials.  When doped or modified with other materials to tune their properties, CAs are specifically useful as: carbon nanotube–carbon aerogel (double-and single-walled carbon nanotubes); metal oxide–carbon aerogel or metal carbonitride–carbon aerogel; and as polymer composites of these materials.
 

Benefits

Carbon aerogels:

  • provide high specific surface areas combined with a fully tunable three-dimensional structure.
  • have tunable performance for specific applications by the addition of dopants that can enhance  the electrical, thermal, and mechanical properties of the composite material.
  • are excellent thermal insulators because their gaseous components greatly reduces heat transfer by conduction, convection, and radiation.
  • improve electric double-layer supercapacitors—very low impedance compared to conventional supercapacitors, yet can absorb or produce very high peak currents.
Applications and Industries
  • Energy storage in batteries and supercapacitors are an ideal use of carbon aerogels. Tunable porosities can be used to minimize diffusion resistance while maintaining constant surface area.

                    *CAs can boost supercapacitors, with values to thousands of farads based on a capacitance of 104 F/g and 77 F/cm3.
                    *Batteries can use CAs as current collectors or scaffolds for 3D intercalaters.

  • Hydrogen generated from water by solar energy, and electric energy from sustainable sources, are anticipated fuels of the future. These technologies incorporate CAs as functional nanomaterials.
  • CAs as nanocatalysts can assist in electrocatalysis as electrode materials and by providing catalyst support in proton-exchange-membrane fuel cells.
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Application 20110024698
Application
20110024698
Mechanically Stiff, Electrically Conductive Composites of Polymers and Carbon Nanotubes
Using SWNT-CA as scaffolds to fabricate stiff, highly conductive polymer (PDMS) composites. The SWNT-CA is immersing in a polymer resin to produce a SWNT-CA infiltrated with a polymer resin. The SWNT-CA infiltrated with a polymer resin is cured to produce the stiff and electrically conductive composite of carbon nanotube aerogel and polymer.
Lawrence Livermore National Laboratory 04/15/2010
Filed
Application 20100187484
Application
20100187484
MECHANICALLY ROBUST, ELECTRICALLY CONDUCTIVE ULTRALOW-DENSITY CARBON NANOTUBE-BASED AEROGELS
A method of making a mechanically robust, electrically conductive ultralow-density carbon nanotube-based aerogel, including the steps of dispersing nanotubes in an aqueous media or other media to form a suspension, adding reactants and catalyst to the suspension to create a reaction mixture, curing the reaction mixture to form a wet gel, drying the wet gel to produce a dry gel, and pyrolyzing the dry gel to produce the mechanically robust, electrically conductive ultralow-density carbon nanotube-based aerogel. The aerogel is mechanically robust, electrically conductive, and ultralow-density, and is made of a porous carbon material having 5 to 95% by weight carbon nanotubes and 5 to 95% carbon binder.
Lawrence Livermore National Laboratory 01/05/2010
Filed
Application 20120028798
Application
20120028798
POROUS SUBSTRATES FILLED WITH NANOMATERIALS
A composition comprising: at least one porous carbon monolith, such as a carbon aerogel, comprising internal pores, and at least one nanomaterial, such as carbon nanotubes, disposed uniformly throughout the internal pores. The nanomaterial can be disposed in the middle of the monolith. In addition, a method for making a monolithic solid with both high surface area and good bulk electrical conductivity is provided. A porous substrate having a thickness of 100 microns or more and comprising macropores throughout its thickness is prepared. At least one catalyst is deposited inside the porous substrate. Subsequently, chemical vapor deposition is used to uniformly deposit a nanomaterial in the macropores throughout the thickness of the porous substrate. Applications include electrical energy storage, such as batteries and capacitors, and hydrogen storage.
Lawrence Livermore National Laboratory 08/01/2011
Filed
Technology Status
Development StageAvailabilityPublishedLast Updated
PrototypeAvailable02/06/201202/06/2012

Contact LLNL About This Technology

To: Charity Follett<follett2@llnl.gov>