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Electrical conductivity of monolithic and powdered carbon aerogels and their composites

Schettler, Jessica and Schwan, Marina and Platzer, Dominik and Milow, Barbara (2022) Electrical conductivity of monolithic and powdered carbon aerogels and their composites. Seventh International Conference on Multifunctional Hybrid and Nanomaterials, 2022-10-19 - 2022-10-22, Genua, Italien.

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Abstract

Carbon aerogels are three-dimensional, open-porous, amorphous materials produced via carbonization of organic aerogels such as resorcinol-formaldehyde, phenol-formaldehyde, resorcinol-formaldehyde-melamine, or biomass-based ones. Unique properties of carbon aerogels such as well-controlled porosity, large specific surface area, high electrical conductivity, and low envelope density make them promising material for applications in adsorption, catalysis, supercapacitors or as a cathode host in lithium-sulfur battery cells. Their electrical conductivity, remarkable for porous materials, is one of the key factors for electrochemical applications. The electrical conductivity of amorphous carbon materials is related to their electronic structure, the size of graphitic lattices or graphitic character, heteroatoms and so-called bulk electrical conductivity. In most electrochemical applications, the carbon aerogels are used as powders for e.g. electrode materials. Therefore, the measurement of the electrical conductivity of powder materials is of great importance. For powders, conductivity consists of: 1) the conductivity of individual grains and 2) the conductivity of the powder. The conductivity of individual grains depends only on conductivity of the material (monolithic conductivity). In contrast, the conductivity of powder depends on several factors e.g. the shape of grains, their packing, compressibility, and the contact between the grains. Measurements of the electrical resistivity of powders are usually performed on the bed of grains under pressure. Within the presentation, we will report on our studies showing the correlation between structural, physical, mechanical and electrical properties of pure and activated carbon aerogels, as well as aerogel-composites. Furthermore, the influence of applied force, compressibility of aerogels and composites, and particle shape were investigated by using the four-pins-method. The conductivity of monoliths and powders was measured at room temperature, for powders the resistivity was determined in the force range from 0.1 to 20.0 kN. For structural and physical characterization Raman spectroscopy, nitrogen sorption, scanning electron microscopy, and pycnometry were used.

Item URL in elib:https://elib.dlr.de/190117/
Document Type:Conference or Workshop Item (Poster)
Title:Electrical conductivity of monolithic and powdered carbon aerogels and their composites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schettler, JessicaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schwan, MarinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Platzer, DominikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Date:2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Carbon aerogels, electrical conductivity, powders
Event Title:Seventh International Conference on Multifunctional Hybrid and Nanomaterials
Event Location:Genua, Italien
Event Type:international Conference
Event Start Date:19 October 2022
Event End Date:22 October 2022
Organizer:Elsevier
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Electrochemical Energy Storage
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Kröner, Jessica
Deposited On:28 Nov 2022 08:54
Last Modified:24 Apr 2024 20:51

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