SFB 1073 Atomic scale control of energy conversion

C06 Redox reactions of adsorbates at supported catalyst: influence of a buried Schottky contact (Pundt)

The project studies the effect of a built-in electric potential of a buried interface on the surface chemistry (involving H2 and H2O) of supported metal/metal oxide nano-catalysts. Control tactics will include manipulation of the interface and its built-in potential as well as active control by external electric fields.

C06_1

Fig. 1: High resolution TEM picture of a Pd/TiO2 interface in FEI Titan ETEM. The top and bottom right black boxes show the FFT of each film, indicating a single crystalline interface. The red box shows a typically acquired electron energy loss spectrum, that is evaluated as a function of the distance to the interface as indicated with the red arrow, measured with electron beam monochromator.

C06_2

Fig. 2: Atom probe tomography measurement (in cooperation with R. Gemma) of an Pd/TiO2 interface. (a) the reconstructed data and the selected volume (yellow cylinder), (b) reconstruction of t
he Pd/TiO2 interface of the in (a) marked yellow cylinder and (c) the ion concentration profile of Pd, Ti and O species as a function of distance in the cylinder.