Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.9: Poster

Monday, February 26, 2024, 16:30–18:30, ELP 6: Foyer

Construction and test of a (micro-)hollow cathode assembly regarding hydrogen production via methane — •Marcel Margraf — Goethe Universität Frankfurt, IAP

A (Micro-)Hollow cathode assembly was designed with purpose of finding an efficient method to separate Methane into Hydrogen and Carbon. Compared to other discharges a hollow cathode discharge (HCD) allows for higher current densities at same conditions. Due to this higher dissociation degrees can be expected and thus possibly better efficiencies. A cylindrical cathode with a diameter of 0,8mm was used, separated from the anode by a 0,5mm thick MICA isolator. The assembly was powered by a DC high voltage generator and measurements were conducted from 0,2 to 0,9 mA under pressures of 300 to 800 mbar. Discharge voltage and current were measured with an oscilloscope and the conversion rate was measured with a gas analyzer. No correlation between pressure and efficiency was found in this test, however the efficiency went up with higher input currents. The best efficiency of 6,26% +/- 2,62% was achieved with 0,9mA at the highest pressure. This is a promising result for the idea to use such assemblies at atmospheric pressure and a basis for further tests.

Keywords: Hollow cathode; MHCD; Hydrogen; Methane