Unique X-ray microscope paves the way to more powerful batteries

New insights into the morphological and chemical changes in battery materials

21-Nov-2024 - New cathode materials are being developed to further increase the capacity of lithium batteries. Multilayer lithium-rich transition metal oxides (LRTMOs) offer particularly high energy density. However, their capacity decreases with each charging cycle due to structural and chemical changes. ...

From waste to value: The right electrolytes can enhance glycerol oxidation

"Our research could help to convert biomass by-products into valuable chemicals more efficiently"

03-Jul-2024 - When biomass is converted into biodiesel, huge amounts of glycerol are produced as a by-product. So far, however, this by-product has been little utilised, even though it could be processed into more valuable chemicals through oxidation in photoelectrochemical reactors. The reason for this: low ...

Green hydrogen: Improving the stability of iridium catalysts with titanium oxides

High relevance for practical use

18-Dec-2023 - Anodes for the electrolytic splitting of water are usually iridium-based materials. In order to increase the stability of the iridium catalyst, a team at HZB and a group at HI-ERN have now produced a so-called material library: a sample in which the concentration of iridium and titanium oxides is ...

Surface analysis of catalyst particles in aqueous solutions

The results are relevant for the development of efficient photoelectrodes for the production of green hydrogen

25-Jul-2023 - Green hydrogen can be produced directly in a photoelectrochemical cell, splitting water with solar energy. However, this requires the development of super-efficient photoelectrodes that need to combine many talents at the same time: They must be excellent at converting sunlight into electricity, ...

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 ...

When vibrations increase on cooling: Anti-freezing observed

Completely unusual and never observed like this before

10-Aug-2021 - An international team has observed an amazing phenomenon in a nickel oxide material during cooling: Instead of freezing, certain fluctuations actually increase as the temperature drops. Nickel oxide is a model system that is structurally similar to high-temperature superconductors. The experiment ...

Green hydrogen: "Rust" as a photoanode and its limits

“With this new approach, we have added a powerful tool to our arsenal that enables us to identify the realizable potential of photoelectrode materials"

21-Apr-2021 - Metal oxides such as rust are intriguing photoelectrode materials for the production of green hydrogen with sunlight. They are cheap and abundant, but in spite of decades of research, progress has been limited. A team at HZB, together with partners from Ben Gurion University and the Technion, ...

How new materials increase the efficiency of direct ethanol fuel cells

Composite membrane consists of Nafion with embedded nanoparticles

06-May-2020 - A group from Brazil and an HZB team have investigated a novel composite membrane for ethanol fuel cells. It consists of the polymer Nafion, in which nanoparticles of a titanium compound are embedded by the rarely explored melt extrusion process. At BESSY II they were able to observe in detail, ...

Nanoscale heat transport under the microscope

27-Aug-2018 - A team of researchers from the Helmholtz-Zentrum Berlin (HZB) and the University of Potsdam has investigated heat transport in a model system comprising nanometre-thin metallic and magnetic layers. Similar systems are candidates for future high-efficiency data storage devices that can be locally ...

New world record for direct solar water-splitting efficiency

06-Jul-2018 - Hydrogen will play a central role as a storage medium in sustainable energy systems. An international team of researchers has now succeeded in raising the efficiency of producing hydrogen from direct solar water-splitting to a record 19 per cent. They did so by combining a tandem solar cell of ...