摘要:
A carbon nanofoam composite (such as carbon nanofoam paper) includes a carbon foam of interconnected pores of ˜10-2000 nm in size with nanometric carbon walls having a thickness on the order of 20 nm. In embodiments, the carbon nanofoam composite has electronic conductivity of greater than 20 S/cm and optionally at least ˜100 S/cm.
摘要:
A method is disclosed to fabricate carbon foams comprising a bicontinuous network of disordered or irregular macropores that are three-dimensionally interconnected via nanoscopic carbon walls. The method accounts for (1) the importance of wetting (i.e., matching the surface energies of fiber to sol) and (2) the viscosity of the microheterogeneous fluid filling the voids in the carbon paper. Carbon fiber papers are mildly oxidized by plasma etching, which greatly enhances the uniform uptake of resorcinol-formaldehyde (RF) mixtures. The RF solutions are oligomerized prior to infiltration and are cured into continuous polymeric webs that hang supported between adjacent carbon fibers; the polymer-fiber composites are pyrolyzed and retain a sponge-like morphology with 10-1000-nm pores and integrated electronic pathways
摘要:
An article having: a nonconductive fiber and a RuO2 coating. A method of: immersing a nonconductive article in a solution of RuO4 and a nonpolar solvent at a temperature that is below the temperature at which RuO4 decomposes to RuO2 in the nonpolar solvent in the presence of the article; and warming the article and solution to ambient temperature under ambient conditions to cause the formation of a RuO2 coating on a portion of the article. An article having: a nonconductive fiber and a coating. The coating is made by electroless deposition, sputtering, atomic-layer deposition, chemical vapor deposition, or physical vapor deposition.
摘要:
A method of making a carbon nanopipe and ensemble of carbon nanopipes, comprising the steps of flowing a carbon precursor over silica fibers and thereby depositing a durable graphitizable carbon coating of tunable thickness of about 10-500 nm onto the silica fibers and etching away the silica fibers to yield a three-dimensional mat of electronically networked, hollow carbon tubules. A carbon nanopipe comprising a durable graphitizable carbon wall of tunable thickness of about 10-500 nm formed by exposing a silica fiber network to a carbon precursor vapor and thereby depositing a carbon film onto the silica fiber network at a temperature suitable for complete pyrolysis of the carbon precursor and removing the silica fibers.
摘要:
A carbon nanopipe comprising a durable graphitizable carbon wall of tunable thickness of about 10-500 nm formed by exposing a silica fiber network to a carbon precursor vapor and thereby depositing a carbon film onto the silica fiber network at a temperature suitable for complete pyrolysis of the carbon precursor and removing the silica fibers. The atmosphere of the step of depositing is controlled by a two-stage gas manifold wherein stage 1 purges the reaction chamber with pure argon and stage 2 introduces the carbon precursor.
摘要:
A three-dimensional electrode structure for use in a battery comprising a porous three-dimensional substrate formed from a first electrically conductive material, an ion-conducting dielectric material disposed on the porous three dimensional substrate, and a second electrically conductive material disposed on the ion-conducting dielectric material, wherein the ion-conducting dielectric material separates the first electrically conductive material from the second electrically conductive material.
摘要:
Disclosed herein is an article having: a substrate and a RuO2 coating having nanoparticles of RuO2. Also disclosed herein is an article having: a substrate and a RuO2 coating. The coating is made by: immersing the substrate in a solution of RuO4 and a nonpolar solvent at a temperature that is below the temperature at which RuO4 decomposes to RuO2 and warming the substrate and solution to ambient temperature under ambient conditions to cause the formation of the coating.
摘要:
A composite having an electrically conductive substrate and a polymer derived from a vinyl-containing siloxane monomer coating on the substrate. A method of electropolymerizing a vinyl-containing siloxane monomer to form a coating on an electrically conductive substrate.
摘要:
A method of: providing an emulsion having a zinc powder and a liquid phase; drying the emulsion to form a sponge; sintering the sponge in an inert atmosphere to form a sintered sponge; heating the sintered sponge in an oxidizing atmosphere to form an oxidized sponge having zinc oxide on the surface of the oxidized sponge; and heating the oxidized sponge in an inert atmosphere at above the melting point of the zinc. A method of: providing an emulsion comprising a zinc powder and a liquid phase; placing the emulsion into a mold, wherein the emulsion is in contact with a metal substrate; and drying the emulsion to form a sponge.
摘要:
A method of storing charge comprising the steps of providing a capacitor comprising an anode, a cathode, and an electrolyte, wherein the electrolyte comprises a nonaqueous liquid of sufficient dielectric constant to dissociate salts soluble in the nonaqueous liquid, a composite comprising a prefabricated porous carbon electrode structure or a carbon foam substrate that is a prefabricated paper structure and a coating deposited by infiltrating the structure with iron oxide via self-limiting electroless deposition on the surface.