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37 Current news of Helmholtz-Zentrum Berlin für Materialien und Energie
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Nanodiamonds can be activated as photocatalysts with sunlight
These inexpensive materials could be a key to further processing CO₂ into valuable hydrocarbons with sunlight in the future
02-Dec-2022
Nanodiamond materials have potential as low-cost photocatalysts. But until now, such carbon nanoparticles required high-energy UV light to become active. The DIACAT consortium has therefore produced and analysed variations of nanodiamond materials. The work shows: If the surface of the ...
Photocatalysis: Processes in charge separation recorded experimentally
The results provide clues to increase the efficiency of photocatalysts
11-Nov-2022
Certain metal oxides are considered good candidates for photocatalysts to produce green hydrogen with sunlight. A Chinese team has now published exciting results on copper(I) oxide particles in Nature, to which a method developed at HZB contributed significantly. Transient surface photovoltage ...
Tandem solar cells with perovskite: nanostructures help in many ways
Customised nanotextures can help to improve perowskite semiconductor materials on diverse levels
02-Nov-2022
By the end of 2021, teams at HZB had presented perovskite silicon tandem solar cells with an efficiency close to 30 percent. This value was a world record for eight months, a long time for this hotly contested field of research. In the journal Nature Nanotechnology, the scientists describe how ...
Batteries without critical raw materials
Berlin based research group "operando battery analysis" has developed new cell chemistry
27-Oct-2022
The market for rechargeable batteries is growing rapidly, but the necessary raw materials are limited. Sodium-ion batteries, for example, could offer an alternative. A joint research group from HZB and Humboldt-Universität zu Berlin has investigated new combinations of electrolyte solutions and ...
High entropy alloys: structural disorder and magnetic properties
"High-entropy alloys are an extremely diverse and exciting class of materials”
26-Oct-2022
High-entropy alloys (HEAs) are promising materials for catalysis and energy storage, and at the same time they are extremely hard, heat resistant and demonstrate great variability in their magnetic behaviour. Now, a team at BESSY II in collaboration with Ruhr University Bochum, BAM, Freie ...
Green hydrogen: faster progress with modern X-ray sources
11-Oct-2022
In order to produce green hydrogen, water can be split up via electrocatalysis, powered by renewable sources such as sun or wind. A review article in the journal Angewandte Chemie Int. Ed. shows how modern X-ray sources such as BESSY II can advance the development of suitable electrocatalysts. In ...
Water distribution in the fuel cell made visible in 4D
The analysis opens new possibilities for more efficient and thus more cost-effective fuel cells
09-Jun-2022
Teams from Helmholtz-Zentrum Berlin (HZB) and University College London (UCL) have visualised the water distribution in a fuel cell in three dimensions and in real time for the first time by evaluating neutron data from the Berlin Experimental Reactor shut down in 2019. The analysis opens new ...
Liquid crystals for fast switching devices
Simple rod-shaped molecules with a single center of chirality self-assemble into helical structures at room temperature
08-Dec-2021
An international team has investigated a newly synthesized liquid-crystalline material that promises applications in optoelectronics. Simple rod-shaped molecules with a single center of chirality self-assemble into helical structures at room temperature. Using soft X-ray resonant scattering at ...
New world record in materials research - X-ray microscopy with 1000 tomograms per second
"This method opens a door for the non-destructive study of fast processes in materials, which is what many research groups and also industry have been waiting for"
29-Sep-2021
Tomoscopy is an imaging method in which three-dimensional images of the inside of materials are calculated in rapid succession. Now a team led by HZB physicist Francisco García Moreno has achieved a new world record at the TOMCAT beamline of the Swiss Light Source at the Paul Scherrer Institute: ...
New insights into switchable MOF structures
03-Jun-2021
Metal-organic framework compounds (MOFs) are widely used in gas storage, material separation, sensor technology or catalysis. A team led by Prof. Dr. Stefan Kaskel, TU Dresden, has now investigated a special class of these MOFs at the MX beamlines of BESSY II. These are "switchable" MOFs that can ...
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