Sustainable Energy Technology


ple of photocatalytic water splitting

Despite the great need for a technical realization of photoelectrochemical hydrogen production so far only the basic feasibility has been demonstrated in the laboratory. On an industrial scale, it is not yet possible to develop efficiently working cells. A thorough understanding as a basis for systematic development is missing.

In the department of "Sustainable Energy Technology" innovative techniques for fabrication of large area photoelectrodes are evaluated. In close cooperation with the Helmut-Schmidt-University, Hamburg, in particular the use of cold gas spraying for the production of electrodes is being tested. An important step towards enhancing the efficiency is an optimal structuring of the surface. Methods for structuring of the electrode surfaces from the nano to micro range are developed at the HZG.

Verschiedene Elektroden

Different electrodes manufactured with the CGS process (TiO2, Hematite, BiVO4)

For a commercially simple and economical fabrication of large area photoelectrodes it is necessary to transfer semiconductor powders (eg TiO2, WO3, Hämatit (α-Fe2O3)) to an efficiently working electrode structure.

Surface topography CGS electrodes

One of the main factors that determine the efficiency of the catalyst is the surface area availability for the catalytic water splitting. Our department is therefore working with structured electrodes that feature a much higher surface area compared to flat electrodes. We employ novel techniques for this structuring at different scales.

Examples of our research


Director of the Division "Materials Technology"

Prof. Dr. Thomas Klassen

Institute of Materials Research - Materials Technology

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