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Hydrogen Fuel from Water - An Advanced Electrocatalyst based on Nitrogen doped Carbon Nanotubes
Umeå University, Faculty of Science and Technology, Department of Physics. (Nano for Energy)
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The production of cost-effective catalysts for the production of hydrogen by electrolysis of water is important for clean energy production. In this work we report on a study of molybdenum disulfide (MoS2) as catalyst for the hydrogen evolution reaction (HER). Nitrogen doped carbon nanotubes (NCNTs) directly synthesized onto carbon paper have been decorated with MoS2. The electrodes utilize the improved conductivity of the NCNTs and the carbon paper for electron transport, combined with the high catalytic activity of MoS2. The NCNTs were successfully decorated with co-axial nano-flakes of MoS2 by a single step solvothermal process using Dimethylformamide (DMF) and ammonium tetrathiomolybdate. MoS2 was also prepared with alternative methods for comparison. The effects of supporting MoS2 on NCNTs were studied by simulations with density functional theory (DFT).

The most active adsorption sites for hydrogen on MoS2 were identified and were on the edges. The catalyst showed competitive activity with other earth-abun- dant catalysts with an onset potential of 170 mV and a small Tafel slope of 40 mV/dec. The improved catalytic activity of HER by having NCNTs as support was confirmed by DFT and experimental results. 

Place, publisher, year, edition, pages
2015. , 88 p.
Keyword [en]
Molybdenum disulfide, Carbon nanotubes, Hydrogen evolution reaction, Electrolysis of water
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-105553OAI: diva2:826581
Subject / course
Examensarbete i teknisk fysik
Educational program
Master of Science Programme in Engineering Physics
Available from: 2015-06-26 Created: 2015-06-25 Last updated: 2015-06-26Bibliographically approved

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Ekspong, Joakim
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Department of Physics
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