Sebastian Stock

Carbon

Hydrogen densification in carbon nanopore confinement: Insights from small-angle neutron scattering using a hierarchical contrast model

This study explores hydrogen densification in nanoporous carbon, leveraging small-angle neutron scattering (SANS) at the D16 instrument, Institut Laue-Langevin, Grenoble. It highlights how, under low-pressure and supercritical temperatures, hydrogen adsorption is significantly influenced by pore size. The analysis, using a hierarchical pore model, shows that the smallest pores can achieve and even exceed the bulk solid hydrogen density at about 1 bar and 77 K, while larger pores exhibit much lower densities. These insights are crucial for designing efficient hydrogen storage materials, emphasizing the need to optimize pore size to enhance performance at practical, low-pressure conditions.

Best Student Talk Award to Dipl.-Ing. Sebastian Stock

Sebastian Stock, PhD student at the Department of Physics, received the award for the best student talk at the symposium "Neutron Scattering Enabled Energy Materials Design" at the 50th MRS Spring Meeting and Exhibit in San Francisco. In the award-winning talk, Sebastian Stock presented his research results on "In Situ Small Angle Neutron Scattering Study of Hydrogen Physisorption in Nanoporous Carbons". His work demonstrates the potential of neutron scattering techniques in the study of hydrogen physisorption in nanoporous carbon materials. The in-situ measurements of hydrogen physisorption at the atomic level help to better understand the behavior of hydrogen in nanopores and improve the performance and efficiency of hydrogen storage.

SyNergy_Mat Lab

DI Sebastian Stock

Education

04/2021 to date Doctoral studies in Materials Science at the Montanuniversität Leoben, Austria, in cooperation with the Institute Laue Langevin in Grenoble, France
11/2018 until 03/2021 Master studies in Materials Science at the Montanuniversität Leoben
10/2014 until 11/2018 Bachelor studies in Materials Science at the Montanuniversität Leoben
09/2009 until 07/2014 Technical College for Mechanical Engineering, Leoben, specializing in metallurgy
Graduation and diploma examination
09/2005 until 07/2009 BG/BRG Neu, Leoben
09/2001 until 7072005 Franz Jonas Elementary School, Trofaiach
Theses
07/2020 until 02/2021 Master thesis at the Institute of Physics:
„The potential of biomass-derived activated carbons for hydrogen storage“
Experimental Methods: XRD, SAXS, Gas sorption, Raman Spectroscopy
Awards: Student Award of the Austrian Physical Society (ÖPG), Young Minds Section
10/2018 Bachelor thesis at the Institute of Physics:
„Investigation of a cobalt doped Few-layer-graphene electrode for supercapacitor applications”
Experimental Methods: XRD, SAXS, Cyclic Voltametry
07/2013 High school diploma thesis at Ebner GmbH, Leonding in Austria

Publications

Coffee Waste-Derived Nanoporous Carbons for Hydrogen Storage
Sebastian Stock ACS Applied Energy Materials / SyNergy_Mat Lab

Biological waste such as residues from the food and beverage industry provides a valuable and abundant resource to be used as a precursor for the synthesis of activated carbons that can be subsequently employed as adsorbents for, e.g., hydrogen storage. Materials with a large specific surface area and pores of appropriate size are necessary to achieve reasonable hydrogen adsorption capacity. Here, we present the repeatable synthesis of activated carbons from coffee waste, i.e., spent coffee grounds and coffee silver skins, on the basis of two independently synthesized batches. The carbonization process under nitrogen gas flow followed by chemical activation with solid potassium hydroxide results in microporous carbons with bimodal pore size distribution and specific surface area up to 3300 and 2680 m2/g based on Brunauer–Emmett–Teller and density functional theory methods, respectively. The materials exhibit excellent hydrogen adsorption performance under cryogenic conditions (77 K), reaching high and fully reversible excess gravimetric hydrogen uptake values of up to 5.79 wt % at 37 bar, and total capacities exceeding 9 wt % at 100 bar.

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Publications