elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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. 6th INTERNATIONAL SEMINAR ON AEROGELS, 28.-30. Sep. 2022, Hamburg, Deutschland.

[img] PDF
2MB

Abstract

Carbon aerogels are three-dimensional, open-porous, amorphous materials introduced by R. Pekala 1989. Starting from organic aerogels, carbon aerogels exhibit unique properties such as well-controlled pore size distribution, high porosity, large specific surface area, high electrical conductivity, and low envelope density. This make them promising material for applications in adsorption, catalysis, supercapacitors or as a sulfur hosting material in cathodes of metal-sulfur battery cells. One of the key factors for electrochemical applications is the electrical conductivity. For amorphous carbon materials it 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 materials 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 monolithic conductivity of the material. 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 this presentation, we will report on our recent studies showing the correlation between structural, physical, mechanical and electrical properties of pure and activated carbon aerogels, as well as aerogel-composites. For this purpose, the influence of applied force, compressibility of aerogels and composites, and particle shape were investigated using the four-pin method to measure electrical conductivity. Monoliths and powders were measured at room temperature, and for powders the resistivity was determined in the force range from 1 to 20 kN. For structural and physical characterization nitrogen sorption, scanning electron microscopy, and pycnometry were used.

Item URL in elib:https://elib.dlr.de/188991/
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 iD
Schettler, JessicaJessica.Schettler (at) dlr.deUNSPECIFIED
Schwan, MarinaMarina.Schwan (at) dlr.deUNSPECIFIED
Platzer, DominikWF-AEGUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Carbon aerogels, electrical conductivity, powders
Event Title:6th INTERNATIONAL SEMINAR ON AEROGELS
Event Location:Hamburg, Deutschland
Event Type:international Conference
Event Dates:28.-30. Sep. 2022
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: Schettler, Jessica
Deposited On:17 Oct 2022 08:26
Last Modified:17 Oct 2022 08:26

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.