Heiki Erikson „Electrochemical reduction of oxygen on nanostructured palladium and gold catalysts“ | University of Tartu

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Contacts of UT units

Faculty of Arts and Humanities
Faculty phone: 
+372 737 5341
Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5341
    Faculty address: 
    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
    Faculty phone: 
    +372 737 5651
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    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
    Faculty phone: 
    +372 737 5221
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
    Faculty phone: 
    +372 737 5314
    Faculty address: 
    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
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    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
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    +372 737 5301
    Faculty address: 
    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
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    J. Liivi 4, 50409, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    +372 435 5232
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    Posti 1, 71004 Viljandi
Faculty of Social Sciences
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+372 737 5957
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Lossi 36, 51003 Tartu
  • Dean's Office
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    + 372 737 5900
    Faculty address: 
    Lossi 36, 51003 Tartu
  • Institute of Education
    Faculty phone: 
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    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
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    Lossi 36–301, 51003 Tartu
  • School of Economics and Business Administration
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  • Institute of Psychology
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Faculty of Science and Technology
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Vanemuise 46–208, 51014 Tartu
  • Dean's Office
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  • Estonian Marine Institute
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  • Institute of Physics
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  • Institute of Molecular and Cell Biology
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  • Tartu Observatory
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  • Institute of Technology
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  • Institute of Ecology and Earth Sciences
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    Vanemuise 46, 51003 Tartu
Institutions
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    W. Struve 1, 50091 Tartu
  • Youth Academy
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    Uppsala 10, 51003 Tartu
  • Institute of Genomics
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    Faculty address: 
    Riia 23b, 51010 Tartu
  • Museum
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    +372 737 5674
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    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
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    Faculty address: 
    Vanemuise 46, 51003 Tartu
Support Units
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  • Centre for Entrepreneurship and Innovation
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    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
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    Faculty address: 
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  • Estates Office
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    Ülikooli 18a, 51005 Tartu
  • Finance Office
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  • Grant Office
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    Ülikooli 18, rooms 302 and 304, 50090 Tartu
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  • Marketing and Communication Office
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    Faculty address: 
    Ülikooli 18, rooms 102, 104, 209, 210, 50090 Tartu
  • Office of Academic Affairs
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    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Procurement Office
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    Ülikooli 18a, 51005 Tartu
  • Rector's Strategy Office
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Heiki Erikson „Electrochemical reduction of oxygen on nanostructured palladium and gold catalysts“

Date: 
28.08.2015 - 14:00

On the 28 August at 14.00 Heiki Erikson will defend his PhD thesis „Electrochemical reduction of oxygen on nanostructured palladium and gold catalysts“ in chemistry in the Faculty on Science and Technology in the University Tartu (Chemicum, Ravila 14a-1021).

Thesis supervisors: 

Associate Professor Kaido Tammeveski (PhD), University of Tartu

Senior Research Fellow Ave Sarapuu (PhD), University of Tartu 

Opponent: Professor Elisabet Ahlberg (PhD), University of Gothenburg (Sweden)

Summary

Nanostructured palladium and gold catalysts. This process is essentially important in the low-temperature fuel cells. Platinum is the most active metal for the ORR, but due to the lower price and similar properties palladium has been proposed for its substitution. For the characterisation of studied materials, several surface analysis methods (scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, X-ray photoelectronspectroscopy, energy dispersive X-ray spectroscopy) and electrochemical methods (cyclic voltammetry, the rotating disk electrode method) were used. The studied nanostructured electrodes were prepared using various methods including electron beam evaporation, electrochemical deposition and chemical synthesis. The ORR activity of the catalysts was evaluated in sulphuric acid and in potassium hydroxide solutions. In general the studied nanostructured Pd and Au had higher electrocatalytic activity in alkaline media where the oxygen reduction reaction on Pd-based catalysts proceeded mainly via a four-electron pathway that is preferred in the fuel cells, while on Au-based catalysts the main product was hydrogen peroxide, which was further reduced to water. In acid solutions the ORR on gold-based catalysts yielded hydrogen peroxide, on palladium-based catalysts it depended more strongly on the morphology of the catalyst. On Pd nanocubes and Pd-Au alloys the number of electrons transferred per oxygen molecule was closer to 4 than the other studied catalysts. The studied catalysts were evaluated also by calculating the specific activities that was found to be the highest for nanocubes in both electrolytes. For all nanostructured electrocatalysts studied the mechanistic pathway of the ORR was similar to that of the respective bulk electrodes.

Location: 
Ravila 14a-1021
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