Keywords: BESSY II (269)

News    26.06.2018

Dr. Raül Garcia Diez received poster award at the international synchrotron conference SRI 2018

Raül Garcia Diez is awarded the poster prize.
Copyright: SRI 2018

HZB researcher introduces unique operando characterization by soft X-ray spectroscopy

The HZB physicist Raül Garcia Diez has been awarded a poster prize at the international conference "Synchrotron Radiation Instrumentation 2018" (SRI 2018) in Taiwan. He presented how the HZB team intends to observe the reactions in electrocatalysts under "operando" conditions with soft X-rays from BESSY II.

“Operando" analysis is of vital importance for investigating catalytic processes in materials and getting insights into the chemical reaction. This enables researchers to understand the mechanisms that limit the performance and stability of electrocatalyst materials. However, "operando" characterization techniques for catalysts and liquid environments - especially for soft X-ray applications - have to been pushed beyond the current limits first.

"Operando" investigations in a wide energy range

Dr. Raül Garcia Diez is part of Dr.-Ing. Marcus Bär's young investigator research group, which is developing this experimental setup in the EMIL laboratory. This includes a compact X-ray spectrometer (HiTS: "High transmission soft x-ray emission spectrometer") and a flow-cell suited for electrochemistry. The X-ray optics designed for the HiTS spectrometer enable material investigations over an extremely wide energy range (from 50 to 2,000 eV).

"Our design sets new standards in the field of soft X-ray spectroscopy. I am happy that I could report at the conference about the progress made in developing the EMIL infrastructure for “operando” measurements. The poster award is a recognition of our work," says Raül Garcia Diez.

The International Conference on Synchrotron Radiation Instrumentation takes place every three years. With approximately 800 participants, it is the largest conference in this field; almost all synchrotron facilities in the world were represented at this year's conference with talks and posters.



You might also be interested in
  • <p>Experiments at the femtoslicing facility of BESSY II revealed the ultrafast angular momentum flow from Gd and Fe spins to the lattice via orbital moment during demagnetization of GdFe alloy.</p>SCIENCE HIGHLIGHT      10.05.2019

    Laser-driven Spin Dynamics in Ferrimagnets: How does the Angular Momentum flow?

    When exposed to intense laser pulses, the magnetization of a material can be manipulated very fast. Fundamentally, magnetization is connected to the angular momentum of the electrons in the material. A team of researchers led by scientists from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) has now been able to follow the flow of angular momentum during ultrafast optical demagnetization in a ferrimagnetic iron-gadolinium alloy at the femtoslicing facility of BESSY II. Their results are helpful to understand the fundamental processes and their speed limits. The study is published in Physical Review Letters. [...]

  • <p>Tomography of a lithium electrode in its initial condition.</p>SCIENCE HIGHLIGHT      06.05.2019

    3D tomographic imagery reveals how lithium batteries age

    Lithium batteries lose amp-hour capacity over time. Microstructures can form on the electrodes with each new charge cycle, which further reduces battery capacity. Now an HZB team together with battery researchers from Forschungszentrum Jülich, the University of Munster, and partners in China have documented the degradation process of lithium electrodes in detail for the first time. They achieved this with the aid of a 3D tomography process using synchrotron radiation at BESSY II (HZB) as well at the Helmholtz-Zentrum Geesthacht (HZG). Their results have been published open access in the scientific journal "Materials Today". [...]

  • <p>SnSe is a highly layered orthorhombic structure. SnSe undergoes a phase transition of second order at 500&deg;C with an increase of the crystal symmetry from space group Pnma (left) to Cmcm (right).</p>SCIENCE HIGHLIGHT      24.04.2019

    High-efficiency thermoelectric materials: new insights into tin selenide

    Tin selenide might considerably exceed the efficiency of current record holding thermoelectric materials made of bismuth telluride. However, it was thought its efficiency became enormous only at temperatures above 500 degrees Celsius. Now measurements at the BESSY II and PETRA III synchrotron sources show that tin selenide can also be utilised as a thermoelectric material at room temperature – so long as high pressure is applied. [...]