We present a demonstration involving the oxidative photobleaching of a raspberry juice dye under visible laser light irradiation using the semiconductor titanium dioxide. A plausible interpretation of the phenomenon is discussed that aids in the understanding of semiconductor energetics and the nature of light.

The movement "Fridays for Future" is a good indicator for students not only having a very strong interest in sustainability, but also a high motivation to actively discuss this topic. For this reason, it is important for schools to provide the necessary basic knowledge and to give students insight into current research and application within the realm of sustainability education and SDGs. In this article digital learning tools for the concept "Alternative Solar Cells with Titanium Dioxide" (ALSO-TiO 2) are presented, that can be used to implement the topic "Solar Cells" in regular chemistry classes. The concept bridges the gap between the galvanic cell as a compulsory subject and dye-sensitized solar cells (DSSC), also known as Grätzel-cells. Thus didactic experiments, so-called photogalvanic cells, are explored with the help of an e-book. In addition, a small eye-tracking study is presented which was carried out in order to develop a new edition of an interactive animation.

Energy transition is one of the main global challenges of this century. To realize it and reach the UN´s ecological sustainability goals the topic sustainable energy and different ways of approaching energy transition have to be taught at school. As fuel cells can play a key role in the energy turnaround, they should be an integral part in chemistry education. Here we present a series of hands-on experiments focusing on alkaline, microbial and direct methanol fuel cells to help pupils understand how fuel cells work.

Laboratory experiments examining the fundamental processes in the conversion of light into electrical energy using photogalvanic cells have been developed. The basic components of the photogalvanic cells are photoelectrodes, consisting of a thin layer of nanocrystalline TiO2 (anatase) sintered on conductive glass; low-cost counter electrodes (platinized razor foils from electric razors); and different sacrificial donors in the electrolyte solution. These simple cells are suitable for classroom investigations examining the operating principles of photogalvanic cells and the influence of different parameters on their efficiency. With these experiments instructors can introduce topics of modern research and technology into the curriculum.

Sonnencremes enthalten eine Mischung organischer und anorganischer Filter, die eine möglichst große Bandbreite an UV‐Strahlung absorbieren. Wie das funktioniert, können Schüler mit einer UV‐Taschenlampe, einer Wärmebildkamera und Alltagsmaterialien wie Kunststofffolien oder Textmarkern erkunden. Eine Versuchsreihe nicht nur vor dem Freibadbesuch.