© HZB/K. Haas (alle Fotos)
They are back: Sheep and goats graze the Wannsee campus again
The meadows are lush green, the ice saints (almost) over: Now is the perfect time for the sheep and goats to return from their winter quarters! Until late autumn, they will now graze the near-natural HZB campus in Wannsee and serve the natural preservation of the landscape - completely without a lawn mower.
The meadows are lush green, the ice saints (almost) over: Now is the perfect time for the sheep and goats to return from their winter quarters! Until late autumn, they will now graze the near-natural HZB campus in Wannsee and serve the natural preservation of the landscape - completely without a lawn mower.
On 14 May 2020, shepherd Olaf Kolecki brought his "protégé" back to the Wannsee campus. Among them are five sheep (4 white Skudden and one black Skudden-Pomeranian Landschaf crossbreed, five lambs (3 white Skudden lambs and 2 black lambs, mother is the crossbreed) and five goats (2 Boer goats, the brown and the brown-white and three goat lambs).
Since goats and sheep have different food preferences, this mixture is just right for maintaining the green areas. The grazing is particularly insect-friendly and contributes to increasing the biodiversity of the wild meadows. And also many employees have grown fond of the animals over the past year and have missed the bleating on the campus a little bit in the last weeks.
In an interview (GER) last year the shepherd answered many questions about his work.
Before the arrival of the sheep and goats, the fenced-in eastern area in Wannsee was still being cleaned up. At the beginning of the year the old meadow orchard was "revived". For this purpose, sheds were torn down and some trees were felled to give the old fruit trees more light again. The wood of the felled trees was piled up in several deadwood heaps. This has created an important habitat and refuge for insects and small animals.
Sustainability at HZB on the Intranet
The HZB is intensively engaged in sustainable action and research. An overview of the topics and measures can be found on the newly designed intranet pages on sustainability (GER).
- Key technology for a future without fossil fuelsIn June and July 2025, catalyst researcher Nico Fischer spent some time at HZB. It was his sabbatical, he was relieved of his duties as Director of the Catalysis Institute in Cape Town for several months and was able to focus on research only. His institute is collaborating with HZB on two projects that aim to develop environmentally friendly alternatives using innovative catalyst technologies. The questions were asked by Antonia Rötger, HZB.
- Long-term test shows: Efficiency of perovskite cells varies with the seasonScientists at HZB run a long-term experiment on the roof of a building at the Adlershof campus. They expose a wide variety of solar cells to the weather conditions, recording their performance over a period of years. These include perovskite solar cells, a new photovoltaic material offering high efficiency and low manufacturing costs. Dr Carolin Ulbrich and Dr Mark Khenkin evaluated four years of data and presented their findings in Advanced Energy Materials. This is the longest series of measurements on perovskite cells in outdoor use to date. The scientists found that standard perovskite solar cells perform very well during the summer months, even over several years, but decline in efficiency during the darker months.
- Sodium-ion batteries: New storage mechanism for cathode materialsLi-ion and Na-ion batteries operate through a process called intercalation, where ions are stored and exchanged between two chemically different electrodes. In contrast, co-intercalation, a process in which both ions and solvent molecules are stored simultaneously, has traditionally been considered undesirable due to its tendency to cause rapid battery failure. Against this traditional view, an international research team led by Philipp Adelhelm has now demonstrated that co-intercalation can be a reversible and fast process for cathode materials in Na-ion batteries. The approach of jointly storing ions and solvents in cathode materials provides a new handle for designing batteries with high efficiency and fast charging capabilities. The results are published in Nature Materials.