Type of project
The purpose of the project is to
study the effect of an electron beam on gadolinia-doped
cerium oxide (CGO).
The experimental work
You will be trained in operating a transmission
electron microscope (TEM). The materials you will work with is primarily
nanofibers composed of gadolinia-doped
cerium oxide (CGO), which has many applications and is for example becoming an
important material in solid oxide electrolysis cells (SOEC). If time allows,
you can also investigate other oxide nanostructures.
experimental work will focus on changes in CGO when the material is exposed to
the electron beam in the microscope. This can be changes in CGO morphology,
crystal structure or Ce oxidation state). In the experiments you can vary the
beam dose to determine how large a dose the CGO can tolerate before significant
changes are observed. By using a heating stage you can make experiments where
the combined effects of the electron beam and elevated temperatures are investigated.
transition from fossil fuels to renewables hinges on the successful storage of
excess solar and wind energy. A promising energy storage method is high-temperature
electrolysis via SOECs. In our EU funded project HEIST,
we are developing a method to study active electrolysis cells in a TEM.
In a TEM,
the high energy electron beam will always influence the investigated materials,
sometimes by severely damaging them. When studying active electrolysis cells we
need to be able to distinguish between changes in the material induced by the
electrochemical environment and those induced by the electron beam. It is
therefore necessary for us to know the effects of the beam alone.
We think team spirit is important. You
will be part of the HEIST team, which consists of a handful of researchers
primarily from DTU Energy. Your main supervisor will be Søren
Bredmose Simonsen who is the principle investigator in HEIST. You will work
closely together with the two PhD-students in HEIST, Waynah
Dacayan and Zhongtao
Ma who will be co-supervising the project.
Competences after the
Hands-on experience with
transmission electron microscopy
knowledge and experience with oxide nanostructures
about solid oxide electrolysis cells
solid state physics/chemistry and electron microscopy is an advantage