Till innehåll på sidan

Porosity and Structure of Carbon Materials: Control and Use for H2 Storage

Tid: To 2021-04-29 kl 09.15 - 10.00

Föreläsare: Dr. Rasmus Palm, Guest Researcher Tartu Universit

Plats: ZOOM

Abstract:

Amorphous and graphitic carbon materials are of high interest for a wide variety of applications because of suitable conductivity, chemical, porosity and other properties, which can be fine-tuned to a high degree through the control of synthesis parameters. For energy storage applications, e.g. as battery or supercapacitor electrodes or for gas storage, the porosity and structural properties of the carbon material are of critical importance. Contemporary carbon synthesis and activation methods change the carbon structure irreversibly and the reversible changes in carbon structures have been achieved only under very high pressures. In this presentation, the investigation into the use of fine-tuned porous carbons for the adsorptive storage of H2 is presented. For this in situ neutron scattering methods to determine the pore characteristics and hydrogen mobility are used and optimal pore geometries are determined.[1,2] Also, the possibility to reversibly control the formation of graphitic domains in an otherwise non-graphitic carbide-derived carbon is presented and discussed.[3] The capability to induce the formation of graphitic domains under the used temperature and pressure conditions is of high fundamental scientific and technical interest for multiple applications.

Figure. Formation of graphitic domains upon heating of carbide-derived carbon material to 50 K under
Figure. Formation of graphitic domains upon heating of carbide-derived carbon material to 50 K under H2 loading determined with in situ neutron powder diffraction.

References

[1] R. Härmas, R. Palm et al., Transport properties of H2 confined in carbide-derived carbons with different pore shapes and sizes, Carbon. 155 (2019) 122–128.

[2] R. Palm et al., Study of the structural curvature in Mo2C derived carbons with contrast matched small-angle neutron scattering, Carbon. 171 (2021) 695–703.

[3] M. Koppel, R. Palm et al., In situ observation of pressure modulated reversible structural changes in the graphitic domains of carbide-derived carbons, Carbon. 174 (2021) 190–200

Innehållsansvarig:service@aphys.kth.se
Tillhör: Institutionen för Tillämpad fysik
Senast ändrad: 2021-04-22